Stainless Steel Vacuum Flask Manufacturer in China

  • 15 Years+ Stainless Steel Vacuum Flask Manufacturer
  • Daily Production Capacity of 20,000 PCS
  • Volume Varies from Smallest 140ml to Big one 1000ml
  • Customizable Printing for Incentives and Promotions 
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Most Popular Vacuum Flask Models

As the experienced Stainless Steel Vacuum Flask Manufacturer and Supplier in China,  LaiKoe developed and manufactured the latest style of wholesale vacuum flask for Distributors and Dealers. 

Laikoe double wall 18/8 Stainless Steel Vacuum Flask comes with finishing like Steel Brushed Silver / Electroplating / Powder Coat and Gradient finishing.

You could custom vacuum flasks by adding graphics through Silk Screen Printing, Laser Engrave, Air Gas printing, Cover Boot Etc. It means you can buy these flasks for promotional goods or commemorative goods, to promote your brand to all their colleagues and business associates. Check all Models Today for your brand.


350 ml, Bullet Style 18/8 Double Wall Stainless Steel Vacuum Flask, Spill proof lid



500 ml, Bullet Style 18/8 Stainless Steel Vacuum Flask, Double Wall Insulation, Easy Clean

750 ml, Double Insulation Wall 18/8  Stainless Steel Vacuum Flask, Spill proof lid

1000 ml, Double Wall  Vacuum Flask, Spill proof lid, Keeping Drinks Hot, Spill-Free

350 ml, Double Insulation Wall Vacuum Flask, Spill proof lid w Safe Closure

700 ml, Double Wall 18/8  Stainless Steel Vacuum Flask, Spill proof lid, Unique Design

1000 ml, Double Insulation Wall 18/8 Thermos Insulated Flask, Have Screw-top Access

1000 ml, Vacuum Insulated Water Bottles, Wide Mouth Easy to Clean, Durable & Reusable


1250 ml, Vacuum Insulated Coffee Flask w Strap, Keep Cold for 12 Hours, Leak Free, Portable

Custom Unique Insulated Stainless Steel Water Bottle to Boom Your Brand

  1. Share Your Design Idea for your Wholesale Vacuum Flask
  2. We Confirm the Design and Produce the sample
  3. Confirm All Details and Payment 
  4. Your Flasks Production & Shipment
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Custom Unique Vacuum Flask to Boom Your Brand

As a Professional China Stainless Steel Vacuum Flask manufacturer and supplier, LaiKoe masters all processing ways to custom your insulated flasks, using Silk Screen Printing, Laser Engraving, Heat Transfer Printing, Air Gas Printing, Embossing, 3D Printing, etc. Gradient Coating / Gradient Painting in 1C, 2C, 3C are popular. Contact Laikoe Now to Promote Your Brand!

  • Screen Printing
  • Laser Engraving
  • Air Gas Printing
  • UV (3D) Printing
  • Gradient Coating

Vacuum flask, also called as thermos flask keeps your beverages hot and cold for extended period of time. The vacuum flask is great to be with during outdoor activities like mountain climbing, camping, hiking and more. This vacuum flask can withstand harsh environments and for everyday use. This will help reduce every luggage weight.

Laikoe manufacture vacuum flask using food grade 18/8 stainless steel. Thus it is with double wall structure, keeping the bottle from sweating. Vacuum flask helps minimize the risk conditions. Combine with higher performance and usability, this serve as a perfect using for hydration.

The vacuum flask is notable among kids, teens, office workers, travelers and many other people. Laikoe has a huge variety of vacuum flask designs and shapes that fit for every user. Thus, vacuum flask comes with capacity range from 140ml, 350ml, 500ml, 750ml, to 1.0 L bottle.

These vacuum flasks make daily hydration easier and convenient. Plus, this is BPA-free and dishwasher-free, so it is easy to clean and maintain. Consumers will find this amazing bottle useful and practical.

Some vacuum flask designed with lids, which helps prevent content spillage. Whatever you pack in the thermos, whether it is tea or coffee, Vacuum flask will maintain the contents taste fresh along the day. A vacuum flask provides a great capacity to hold liquids temperature and can be of great help for the whole working day. The vacuum flask insulation design offers extra-ordinary temperature retention.

Laikoe develop and design high quality vacuum flask through our in-house production and high tech machineries. We can finish surface products by spray painting or powder coating. Custom vacuum flask for branding can be performed in various ways, such as embossing or debossing, silk screen printing, Air gas printing, etc.

Moreover, custom design thermos for your drinking flask business is executed by our experienced and knowledgeable staff. To meet your unique business or project demands and requirements, Laikoe carefully design bottles according to details. With over 20 of expertise, we can design amazing and awesome outputs.

Laikoe has world-class advanced equipments, testing instruments as well as graphics printing. Through these resources, you are rest-assured of the stability of production we could offer. Laikoe as a leading manufacturer of drinking bottles, provide a one-stop solution for your needs.

1, What is a SS Vacuum Flask?
A SS vacuum flask is a stainless steel insulated, silvery glossy inner, double-walled storage vessel/bottle with a vacuum within its walls that greatly lengthen the period over which the contents inside it remains hotter or cooler than it ambient temperature. It’s a flask technically designed to keep the temperature of its content at a desired temperature by not allowing heat to escape quickly.

2, What is a SS Vacuum Flask used for?
SS Vacuum flasks are used keep beverages, like coffee or tea, at a desired temperature for a prolonged period of time. It is used to keep hot drinks hot. Likewise, it is used to keep cold drink cold for as long as possible depending on the functionality state of the vacuum flask.

3, Is SS Vacuum Flask safe to use?
Yes, Stainless Steel Vacuum Flask is safe to use. While handling ones with glass liner, you have to be very careful because they can break if you mistakenly drop the thermos. For SS one it won’t break. Also, be careful when you use either the glass lined or plastic lined ones for hot liquid. Meanwhile they all can keep the liquid hot enough to burn your skin if care is not taken.

4, What material is my ss vacuum flask made of?
The main parts of a ss vacuum flask are the stopper, an outer and inner wall, and then a base to keep the walls in place. SS vacumm flask is made of high quality food grade double stainless steel wall for inner and outer, with a stopper made of polyethylene plastic. All this materials were deliberately chosen and designed to reduce the rate at which heat is being lost to the surroundings to the possible minimum level.

5, Is stainless steel vacuum flasks harmful to the body?
No, stainless steel vacuum flask is not harmful to the body. As much the stainless steel vacuum flask uses BPA-free, food grade 304 stainless steel that doesn’t leach lead or any other harmful chemical or element, it is safe to use.

So, this is one of the things to watch out for, the grade of the stainless steel used, while purchasing a stainless steel vacuum flask. It is good to note that using this kind of vacuum flask will not pose a threat to healthy drinking water but if it is used to hold acid or alkaline substances, it might leach toxic substances which are harmful to the body.

6, Is my vacuum flask BPA free?
Bisphenol A (BPA) is a toxic chemical found in lining of flasks, water bottles and many other food cans and it is harmful to humans’ health. Vacuum flasks manufactured by manufacturers that play it safe, Laikoe for example, are BPA free and doesn’t leach any harmful chemicals to the content they hold.

7, How is a vacuum flask made and how does it work?
Vacuum flask is a double-walled container made from different materials to prevent heat transfer into or from the surroundings by any of the three ways that heat can travel. It is made of insulating materials, the base and the stopper to prevent heat transfer due to conduction, it has vacuum between its thin walls to prevent heat loss due to convection and its inner silver, shinning coating prevents heat transfer due to radiation. The thin walls also stops heat entering or leaving the flask by conduction.
The casing surrounding the flask also provides additional insulation and barrier against heat transfer.

8, Are thermos flasks allowed on planes?
Thermos flasks may and may not be allowed on plane, it depends on the situation and leniency of the airline you are flying with. At times, there is a limit to the size of thermos flask allowed, bottles or flasks bigger than 3.5 oz. are not allowed. Also, the bottles and flask allowed should not be filled with any content. At the security checkpoint, they will make you pour out and completely empty the flask. At some other time, they do not allow traveler to bring thermos flask or bottle, with or without their contents. However, there are exceptions for baby food, formula and certain medications.

9, Why thermos flask is called vacuum flask?
Thermos flask is technically known as vacuum flask because of the presence of vacuum in its design to prevent heat transfer due to convection and conduction. Apart from being technically known as vacuum flask, most people also call it by the name.

10, Why does the hot tea in my thermos flask remain hot for a long time?
The hot tea in your thermos flask remain hot for a long time because the flask insulates the hot tea from the outside air in order to prevent any form of heat transfer. Since there won’t be any heat transfer between the hot tea and the surrounding air, the temperature remains the same for a longer period. The thermos flask does this not only through the insulation, both the silver shinny inner coating and the vacuum also help to prevent heat transfer.

11, How long can my vacuum flask keep drinks hot?
Depending on the quality of your vacuum flask, the state of functionality and how well you’ve maintained it. Generally speaking, an average thermos flask should be able to keep drinks hot 6 hours. The temperature of the surrounding air is another factor to consider in order to determine how long your vacuum flask will keep drinks hot.
All other things being equal, how long your thermos flask will keep drinks hot solely depends on the quality of the thermos and that’s why it is best to buy a quality product that come from quality control oriented manufacturer like Laikoe.

12, Does my thermos flask keep things cold?
Yes, your thermos flask does keep things cold, just as it keep things hot, and with for a longer period. Your thermos flask will only keep things cold for a longer period, and not at the same temperature forever.

13, How long can my vacuum flask keep drinks cold?
With the same vacuum flask and under the same atmospheric conditions, surrounding air temperature, pressure and humidity, a cold drink will stay cold for a longer period than a hot drink will stay hot. Your vacuum flask can keep drinks cold for up to 12 hours if it is quality and from an experienced manufacturer like Laikoe.

14, Can I dish wash my vacuum flask?
No, you cannot dish wash your vacuum flask. If you put your flask through dishwasher, the dishwasher can get hot enough to affect the designed insulation properties of the flask as well as damage and discolour the silver powder coating.

15, How do I properly clean my vacuum flask?
To hand wash your vacuum flask and get rid of all unsightly stains, remove the cap and pour a mixture of one cup of distilled white vinegar and baking soda in approximate ratio of 1:8 into your stained flask. Then, shake and allow the mixture to frost up. After the fizzing has died down, fill up the flask with hot water. Don’t forget to leave the cap off to avoid pressure build up. Let the flask to rest for few minutes, say for like 8-10 minutes, for it to soak and allow the baking soda solution to start working on the discoloration while the heat of the water softens and collect the stain-inducing particles.
After that, scrub the inside of the flask with a bottle brush to remove the remaining stain untouched by the baking powder solution. Finally, pour out the mixture out of the flask and rinse it repeatedly, over and over again. By now, your flask should be clean as new.

16, How do I stop my vacuum flask from smelling?
To stop your vacuum flask from smelling, you need to thoroughly wash it with vinegar as discussed above. If the smell persist after washing it the first round, simply repeat the cleaning process two more time and completely get rid of the smell.

17, Can heat transfer through a vacuum?
Yes, heat can transfer through vacuum. Out of the three means of transferring heat, heat can only be transferred through a vacuum by radiation. Heat transfer through a vacuum by conduction and convection is not possible as there are no atoms or any form of particles to convey heat through the vacuum in either of the two process.

18. How does my vacuum flask prevent heat loss?
Your vacuum flask prevent heat loss due to the way it was designed and the kind of materials it is made of. The flask has an insulating casing that houses it completely and prevent heat loss. Also, there are thin stainless steel walls that stop heat from entering and leaving the flask by conduction. There is a vacuum in between the inner and outer walls which prevent heat loss due to convection and conduction.

19, How can I prevent heat loss due to convection in my flask?
Heat loss due to convection in your flask is prevented by the vacuum flask between its double walls. You can prevent heat loss due to convection in your flask by keeping the vacuum flask intact by good maintenance and careful handling. Try to avoid doing anything that can damage of the vacuum flask in order to keep it empty, completely and totally free of air. For as long as the vacuum in your flask is in free of air, you are free of losing heat through convection.

20, Why is my SS vacuum flask silver and what is the function?
Both the inner surface of the outer wall and the outer surface of the inner surface are silver to ensure that the inner surface of your vacuum flask is completely lined with it and make sure no heat is loss by radiation.

21, How do I precondition my vacuum flask?
Before filling your vacuum flask with any beverages, be it coffee, tea or hot chocolate, it is advisable you precondition it. In the case of hot content, you pre-heat it. The reverse is the case for cold contents, you simply put ice cubes to precondition it before pouring whatever content you will like to keep cold with your flask.

To pre-heat your vacuum flask, firstly, take some boiling water, very hot water if not extremely hot, and pour in inside your vacuum flask and then cover it with the lid. Let it sit for a few minutes, say 8 – 10 minutes. And finally, pour out the water out of your flask and then fill it with your preferred beverage. When you want to precondition your flask for cold content, use ice cubes instead of hot water.

22, How long can boiled water stay sterile in my vacuum flask?
Boiled water can stay sterile in your sterilized vacuum flask for about 24 hours. This is true if both the hot water and flask are hygienically and carefully handled.
Apart from the handling, a high-quality flask with good liner insulation and lid that provide good and tight seal will keep its content sterile for long.

23, How long can I leave hot milk in a thermos flask?
How long your thermos flask will keep hot milk depends on the quality on its quality. A good quality thermos flask from extraordinary manufacturers like Laikoe can keep hot milk for about 6 hours. Averagely good ones will keep hot milk for 5 hours.
Can I microwave a vacuum flask?
It is strongly not recommended. If the inside the thermos heat up and boils, the seal will pop and make a real mess. At the same time, the flask can explode. So, it is to say thermos flasks do not have affinity for microwave.

24, Can I put my vacuum flask inside a fridge?
Yes, you can put your vacuum flask inside a fridge. But your reason for putting in inside a fridge has to be clearly stated. If you put your vacuum flask inside fridge to make its content cold or make it chilled, you are already mistaken. The double-wall vacuum insulation will protect the water or whatever content you have in there from freezing or getting colder. On the other hand, if your aim of putting your vacuum flask inside a fridge is to precondition it before pouring your cold beverages or smoothie inside, then you are doing the right thing and you will have your content cold for longer period.

25, Where and how do I get a quality vacuum flask?
When it comes to buying of vacuum flask, there is almost endless of option to choose from. You need to first determine what you want and what you need it for, so that you can get the best out of it. In order to get quality flask that will give the best deliverable services from it, search online for a manufacturer that produces high-quality bottles and buy directly from the manufacturer’s website. You can also shop at supermarkets or sports stores to have a visual check on the quality of the various bottle product they have available.

26, What are the factors to consider when purchasing a vacuum flask?
The factors to consider when purchasing a vacuum flask solely depend on the purpose you want the flask to serve, the type of content it will hold and under what conditions. Whatever it is you are looking for in a thermos flask, there is a wide range of options to choose from. To get the best out of your thermos flask, here is a general list of factors to consider when purchasing it; cost, capacity, type of lid, material, heat retention, warranty and some other factors depending on your own personal use.

27, Does Thermos have a lifetime warranty?
Lifetime warranty is a type of written statement provided in the sales of a product that promises the good state and functionality of the of the product and states that the manufacturer is responsible for replacing or repairing the product for as long as one owns the product. Depending on the manufacturers, there are certain conditions under which this warranty holds.

Vacuum Flask Manufacturers: The Ultimate FAQ Guide

Vacuum flask also referred to as thermos flask is an insulated vessel designed to retain temperatures for longer period.

It is multi-use and can therefore hold both hot beverages and cold drinks.

We explore about vacuum flask in this FAQ:

What is Vacuum Flask?

This is a vessel designed using vacuum insulation technology to keep drinks hot or cold for a long period.

It prevents heat loss by convection, conduction and radiation through the double wall, tight lid and the inner silver coating respectively.

Vacuum flask is multi-functional hence it is used with beverages, water or even drinks such as juices and smoothies.

Which Material is used in Vacuum Flask Production?

Vacuum flask production uses food grade 18/8 stainless steel material for the body and polyethylene (PE) plastic for the lid.

Both inner and outer wall of the vacuum flask is made of stainless-steel material which is unbreakable and sustainable.

Some vacuum flasks have their inner lining made of glass or plastic material making them very delicate.

These materials have been tested by U.S food and drug administration (FDA) agency and confirmed to be free of toxic chemicals.

They neither contain the harmful bisphenol A (BPA) chemical nor leech lead or any other element into their flask content.

Is Vacuum Flask same as Insulated Tumbler?


Both vacuum flask and insulated tumbler are engineered using the same vacuum technology therefore, they prevent heat loss the same way.

 Insulated tumbler

Insulated tumbler

However, vacuum flask retains temperature for longer because it has a silver coating which prevents heat loss due to radiation.

Both vacuum flask and insulated tumbler are manufactured using food grade 18/8 stainless steel material which is BPA free and durable.

Vacuum flask

Vacuum flask

How do you Manufacture Vacuum Flask?

The manufacturing process of vacuum flask is as below:

  1. 18/8 stainless steel tubes are cut accurately at the desired lengths.
  2. Water pressure is applied in the tube to swell it to required size and then cut into two equal parts.
  3. The tubes are then bulged into shape and rolled at the corners to meet the requirements.
  4. Bottom part is shrunk to reduce the round shape and then cut uniformly avoiding burrs.
  5. The tubes are cleaned, dried and inspected to confirm if they both qualify as outer and inner shell.
  6. The inner shell is welded at the bottom with a plate and tested for leakage.
  7. The mouth of the outer and inner shell is matched then welded together without bumps or gaps. The same is done at the bottom to make a complete flask.
  8. The welded flask is then put into a vacuum machine to eliminate air between the walls to create a vacuum.
  9. The vacuum flask is tested for temperature by passing hot air and feeling the outside wall for any changes. If the outer wall remains cold then vacuuming has been achieved.
  10. Electrolysis polishing is done by passing current in the inner wall to create a smooth and bright finish.
  11. This is followed by mechanical polishing of the outer wall to give it a smooth and bright surface.
  12. Surface treatment such as powder coating and spray painting is then done followed by logo printing as per the specifications.
  13. The vacuum flask is cleaned, dried and taken through another temperature and leakage test before it is assembled.
  14. The plastic stopper is manufactured by injection molding process. Molten plastic in introduced into an injection machine which then produces a lid as per the specifications.
  15. It is then cleaned and inspected then fitted on the flask to confirm it’s the right fit.
  16. Both the vacuum flask and the lid are then assembled ready for shipping.

What are the Components of Vacuum Flask?

Vacuum flask

Vacuum flask

Stopper lid

Tight fitting stopper made from BPA free plastic material provide a barrier for heat loss due to conduction.

This also avoid spillage of the content which may be very hot hence causing burning.

Double walled body

The body of a vacuum flask is made of double wall 18/8 stainless-steel material with air removed between the walls.

This vacuum space provides insulation to the content by preventing heat loss by convection process.

As a result, hot and cold drinks remain in their original temperatures for hours.


The base of the vacuum flask is to provide support to the walls of the flask.

It is made using a poor conductor material thus cannot transfer heat through it.

How does Vacuum Flask Work?

The main function of a vacuum flask is to retain the beverage temperature for an extended period of time.

Heat travel through conduction, convection and radiation; therefore, vacuum flask works to prevent heat loss through those channels.

The walls are thin and doubled to create a vacuum seal in between them.

This minimizes heat loss by convection since there is no medium by which heat can travel from and into the flask.

The lid is made of plastic which is a poor conductor of heat, therefore, heat is not lost by conduction process.

Vacuum flask’s inner wall is silver and shiny coated to reduce heat loss via radiation.

All these techniques combined with outer casing prevent heat loss thus enabling the vacuum flask to retain temperature for long.

How do Vacuum Flask Manufacturers Control Quality?

Manufacturers’ factories are inspected by quality assurance bodies to confirm their compliance to quality management systems.

They are then given relevant quality certificates which qualifies them as good quality manufacturers of vacuum flasks.

Manufacturers of vacuum flask have also put in place strict quality assurance guidelines that are observed all through the production process.

Their quality control personnel are professionally trained on how to develop and implement quality measures system of production.

They are mandated with supervising the production process to ensure strict adherence to quality measures in place.

Raw materials are fully inspected pre-production to ascertain their quality and this is continued during the process of flaks production.

Only those flasks that meet the criteria are released to the next step of production.

Are Vacuum Flask Durable?

Yes, they are.

Vacuum flasks are made using stainless-steel material which is a sturdy and sustainable material.

It is unbreakable and cannot easily dent thus can serve for a very long time with proper maintenance and handling.

Which Features should you Look for in Vacuum Flask?

Vacuum flask with bag

Vacuum flask with bag

· Double wall vacuum insulation

This prevent loss of heat by conduction and convection due to the vacuum space between the walls.

It is responsible for temperature maintenance for hours for both hot and cold beverages.

The silver shiny coat facing the vacuum space prevents heat loss by radiation thus enhancing temperature retaining.

· BPA free material

The premium grade 18/8 stainless steel and PE plastic material are both free of BPA and other harmful toxins.

They therefore do not leech any chemicals into the beverage held in the vacuum flask.

· Mouth opening

When choosing a vacuum flask consider the mouth opening because of cleaning process.

The mouth should be the right size to make cleaning the inside and filling of the vacuum flask easy.

· Leak proof Stopper

A tight-fitting stopper is important to avoid spilling of content of the vacuum flask.

It should be made of plastic material which cannot conduct heat.

· Sweat free

The vacuum flask should not be able to transfer heat through its walls thus should remain dry throughout its use.

This leaves your hands dry and the surface where the vacuum flask is placed also remain dry.

How long does Vacuum Flask Retain Hot Temperature?

A good quality vacuum flask should retain hot beverage temperature for up to 6 hours.

Good handling and maintenance of the flask is important for it to serve you for longer.

Surrounding air also plays a role in determining the length of time the vacuum flask keeps beverages hot.

Vacuum Flasks are Preconditioned before use; Why is that Necessary?

Preconditioning is done to prepare the vacuum flask for the content temperature before filling the flask with the actual beverage.

This is necessary to retain the temperature for longer.

Before adding hot beverage, the vacuum flask is pre-heated by filling it with boiling water for 10 minutes.

The water is then poured out and the intended beverage; coffee, tea or milk poured.

For cold content, ice cubes are added and left to sit for about 10 minutes as well.

The vacuum flask can also be refrigerated as a way of pre-conditioning it for cold beverage.

They are then removed and the cold beverage poured.

Why should you Buy from Vacuum Flask Manufacturers in China?

China has professional vacuum flask manufacturers who produce high quality flasks which are safe for human use.

Chinese manufacturers of vacuum flasks have over 20 years of experience in the production of vacuum flask.

This makes them well equipped to handle diverse market dynamics from different countries such as USA, UK Germany, Australia, etc.

Vacuum flask with strap

Vacuum flask with strap

They are also the leading producers and exporters of stainless-steel products such as vacuum flasks at very competitive prices.

China, manufacturers have fully automated machines that use the latest technology in their production.

This enables them to have a daily turnover of 3000 vacuum flasks hence assuring clients timely delivery on orders.

Buying from manufacturers guarantees clients a return policy in case of faulty vacuum flasks due to manufacturing defects.

Buying from China manufacturers allows clients to design their own vacuum flasks when placing their orders.

This is made possible by the trained design engineers who guide clients through the entire customization process.

Also, China manufacturers offer an “under-one roof” solution to their clienteles from friendly customer care, shipping and after sales services.

This makes ordering process smooth and also lessen the burden of having to out source for shipping services from different agents.

Some manufacturers may offer to ship for free for very big orders while majority charge freight fee in the order.

Additionally, before bulk buying from China manufacturers, you are able to request for samples to test the vacuum flask quality.

This is offered free of charge for available designs and a small fee applies for customed design samples.

Finally, China manufacturers observe strict quality control measures in their production process thus they guarantee customers high quality vacuum flasks.

This is verifiable by certificate awarded by internationally recognized bodies such as FDA, SGS, etc.

What Payment Options do Vacuum Flask Manufacturers Accept?

Manufacturers accept payments made by telegraphic transfers (T/T), PayPal or Western Union.

They also accept letter of credit (LC) as a form of payment at the sight.

When buying vacuum flasks that are in stock, clients are required to remit 100% payment before the flasks can be shipped.

Custom vacuum flask orders can be paid in two instalments with a 30% deposit made before production begins.

The remaining 70% balance is paid immediately after production is completed.

How do you Prevent Odor in Vacuum Flask?

Odor can easily build up after several use of the vacuum flask.

To prevent this, a mixture of apple cider vinegar and baking soda is used to clean the vacuum flask regularly.

Add a cup of apple cider vinegar and two tablespoons of baking soda into the vacuum flask and shake.

This will create a froth which helps with odor and stain removal.

Allow the froth to settle down before adding hot water and avoid closing the flask to prevent pressure build up.

After about 10 minutes, use a bottle brush too scrub the inside of the vacuum flask properly.

Pour out the mixture then rinse the flask with clean warm water severally.

Let it air dry before the next use.

How do you Clean Vacuum Flasks?

When cleaning your vacuum flask, remove the lid from the vacuum flask and set aside.

Thereafter, add warm soapy water and let it sit for 15 minutes, then use a bottle brush to thoroughly scrub.

Pour out the soapy water and rinse the flask properly using clean warm wet and allow it to air dry.

Cleaning with vinegar and baking soda can be done regularly to prevent odor and remove stubborn stains.

Can Vacuum Flask Loose Heat through Vacuum Space between the Walls?


Heat can be lost through the vacuum seal between the walls by radiation process only.

However, heat loss by convection or conduction is not possible due to absence of conducting medium known as atoms.

The inner part of the outer wall and the outer part of the inner wall are silver coated.

This is to prevent heat transfer through radiation thus enhancing the vacuum insulation process.

What makes Vacuum Flask BPA Free?

Vacuum flaks are BPA free because they are made from materials that have been tested and found to be toxin free.

Such materials are food grade 18/8 stainless steel and polyethylene plastic materials.

Both of these materials are BPA free and do not leech any other toxic element into the content of the flask.

Do Vacuum Flask Manufacturer offer Warranty?


Manufacturers offer clients warranty upon purchase of the vacuum flasks.

This assure clients of replacement or repair of the vacuum flaks in case functionality problems arise within the stated period.

A warranty only applies if the problem is not caused by human error.

What are the Available Sizes of Vacuum Flask?

Vacuum flasks are available in different capacities ranging from 150ml, 350ml, 500ml, 750ml, 1000ml, 1500ml, etc.

The sizes are defined by the purpose of the flask, such as individual, household, events, among others.

Clients can order for flask sizes that fit their intended use.

What are the Disadvantages of Vacuum Flask?

Vacuum flasks are prone to odor when you do not clean them properly after every use.

They require prior temperature preparation through pre-conditioning in order to functional optimally.

Vacuum flasks with inner glass or plastic lining risk exploding with sudden temperature change and can shatter when not handled carefully.

What is the Function of Shiny Silver Coating on Vacuum Flask?

To reduce heat loss through radiation process in the vacuum space.

It is found between the walls in the inner surface of outer wall and outer surface of the inner wall.

Do Vacuum Flask Manufacturers offer Free Samples?

Yes, they do.

Manufacturers offer free samples for readily available stock of vacuum flask and give up to two pieces of vacuum flask design.

For clients who want customized vacuum flasks, a sample fee is charged towards the sample mold development.

This amount is refundable when the client places an order up to certain amount.

The samples are shipped using express courier services and the cost of shipping is borne by clients in both cases.

Different colors of vacuum flask

Different colors of vacuum flask

How long does it take to Manufacture Vacuum Flasks?

It takes an average of 15 days for standard flask and 30 days for customized vacuum flask to be produced.

The production period is determined by the order quantity and the design complexity.

Will Vacuum Flask Manufacturers help in Shipping Process?

A number of manufacturers of vacuum flaks assist with shipping of vacuum flask orders to clients’ respective destinations globally.

What is required is for the client to clearly state the shipping address in their order and the manufacturer will deliver.

The three means of shipping are dependent on the weight of the vacuum flask order.

Samples and a few pieces of vacuum flaks are couriered via DHL, FedEx, TNT, among other courier services.

They take between 2-5 days to be delivered.

Orders below 1 ton or which cannot fill a container are shipped as air freight to their destinations.

This take 3-7 days to arrive to the designated airport.

Vacuum flaks orders that are bulky and weigh 1 ton and above are packed in containers and shipped via sea.

Sea freight take the longest time to arrive to their destination.

The days vary between 30-60 days.

Which Quality Standards Should Vacuum Flasks conform to?

Vacuum flask manufacturers should conform to health and safety, good manufacturing practices, environmental safety standards, labor standards, among others.

This is tested and confirmed by agencies mandated with regulating such quality standards.

Some of the quality standards certificates issued include, FDA, ROHS, ISO, CE among many others.

Do Vacuum Flask Manufacturers help in Custom Designs Process?

Manufacturers have qualified design personnel who take the clients through the custom design process from start to finish.

They offer various customization designs that clients can choose such as size, color and logo printing method for their vacuum flask.

The first step is the client shares the design idea with the manufacturer using formats such as PDF, AI, etc.

The design engineer examines the idea and develop a sample mold from it for the client to confirm.

Once the client is satisfied with the outcome and recommendations for adjustments where necessary, production agreement is signed and deposit made.

Manufacturer notifies the client once production is completed and client clears the remaining balance before shipping is done.

Is Vacuum Flask Safe?


Vacuum flask is made using high quality food grade and FDA approved 18/8 stainless steel material.

This material is free of BPA chemical and does not leech into the vacuum flask content.

Which are the available Vacuum Flask Designs?

Available vacuum flasks designs include:

Custom vacuum flask

Vacuum flask designs

  • Bullet vacuum flask

This flask is design as a bullet and has a one-touch switch lid or push-button lid for easy opening and pouring.

It is slender and can be carried anywhere by one hand or in cup holders. Its lid can serve as a cup.

  • Coffee carafe/ dispensers

This type of vacuum flask is bigger than the bullet flask in terms of capacity.

It wide at the base and narrows a little towards the mouth.

It comes with and attached handle and a pouring sprout to avoid spillage when dispensing the beverage.

This design is not portable and is mostly used in households to serve more than four cups of the beverage.

Depending on your specific needs, you can trust LaiKoe vacuum flasks.

Our vacuum flasks are designed and manufactured to high quality standards.

Contact us now for best prices of vacuum flasks.

Commonly Asked Questions

What’s Vacuum Flask Material?

LaiKoe Vacuum Flasks are made from 18/8 , 304 Grade Stainless Steel, it is of food grade and safe for drinking.

Is Stainless Steel Safe?

18/8 Stainless steel does not leach any chemical, thus it is safe for drinking and touching, BPA Free, Lead Free and Phthalate Free.

What’s the average lead time for my Order?

It ups to your order quantity, time and order complexity for your wholesale vacuum flasks.

Normally it takes 45days to get goods ready after approval on all details.

What’ your Sample Policy?

It is of free charge for 2 pcs of existed vacuum flask.

Courier cost for samples shall be charged in your side, and refundable after order.

What’s Your Payment Method?

 T/T w 30-50% Deposit, Balance before shipping; Or L/C at sight.

What’s MOQ for your Branding on Vacuum Flask?

We have a special favor of minimum quantity for new clients.

Contact us to see the existed colors and capacities of China Vacuum Flask.

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