Visual & Sensory Test
Visual and sensory inspection serves as the first barrier to controlling exterior and printing defects for mass-custom tumblers. Our lab is equipped with a standard light booth, two types of rubbing testers, a cross-cut knife, and vernier calipers to achieve full-range inspection coverage.
Under standard light illumination, our inspectors sort out surface scratches, pits, and incomplete welding that compromise the premium appearance of gift cups. Dry and wet abrasion cycles are performed on rubbing equipment to verify if printed logos fade after long-term daily use. We use professional test tapes to run cross-cut tests and confirm the bonding strength of printing layers. Every finished cup is measured with vernier calipers to control dimensional tolerance, so mismatched lids and irregular outlines will not flow into your bulk shipments.
Material & Food-Safety Verification
Raw material safety screening eliminates food contact risks at the source for drinkware orders. Our complete verification system relies on constant-temperature water baths, digital heating mantles, and stainless steel identification reagents. All stainless steel blanks pass grade identification with a special detection liquid before production. This process filters out unqualified non-food-grade steel and retains only certified 304 and 316 materials.
We apply standardized high-temperature aging to silicone and rubber sealing gaskets. Gaskets undergo continuous boiling for 4 hours followed by 2 hours of natural cooling. Our inspectors check for stickiness, permanent deformation, and abnormal odors after aging. This set of pre-inspection effectively lowers hidden safety troubles for your wholesale and gift drinkware lines.
Physical & Mechanical Performance
We use stainless steel hot water barrels, lid torque testers, and electronic balances to verify the core functional performance of finished drinkware. To evaluate the heat preservation effect, we fill samples with 95℃ hot water and track temperature changes at 6h, 12h, and 24h, respectively. Our internal quality rule defines samples as qualified if the water temperature remains above 42℃ after 6 hours of static placement.
For leak-proof testing, each finished cup is filled with hot water above 90℃ to 50% capacity. The cup is fully sealed and vertically shaken for 10 cycles at 500mm amplitude, with zero seepage or dripping required for approval. A lid torque tester records opening and closing force to match customized tightness standards. We also randomly select samples for 400mm drop impact, capacity calibration, and placement stability inspection, keeping a consistent user experience across all batches you receive.
Surface Coating Test
Coating quality directly determines the anti-corrosion performance and service life of branded gift cups. Our core testing lineup includes coating thickness gauges, cross-cut knives, and salt spray chambers for comprehensive coating inspection. The thickness gauge measures micron-level coating thickness to ensure uniform spraying on the whole cup body. We conduct cross-cut tests to check the bonding condition between coating and metal substrate.
To replicate long-distance cross-region logistics scenarios, we place test samples in salt spray chambers for continuous 24 to 72 hours of corrosion simulation. After testing, our inspectors check for paint blistering and substrate rust spots, cutting down surface quality complaints during transportation and shelf display of your customized cups.
Environmental & Durability Test
A constant temperature & humidity chamber, vibration test table, and standard light booth work together to simulate complex storage and transportation conditions for drinkware shipments. The temperature and humidity chamber recreates extreme environments ranging from -20℃ to 60℃.
This helps us observe fading and deformation caused by drastic temperature shifts. The vibration table simulates repeated bumping during land and sea transit. We place samples in light booths to compare color changes after UV exposure, and combine repeated dry and wet friction cycles to evaluate long-term wear resistance. All simulation tests help maintain stable appearance and performance for your mass-delivered orders.
Full In-House QC Laboratory Instruments
Self-built lab equipment ensures stable batch quality for your custom gift tumblers.
The detection liquid reacts with steel to distinguish between 304 and 316. We won’t let unqualified metal flow into production.
This professional manual tool cuts regular grids on coating surfaces. It is dedicated to quantitative on-site coating adhesion testing.
It provides natural simulated light for visual color comparison. We also check the aging degree under UV light inside the booth.
We use this portable tool to measure all structural dimensions. All finished cup sizes are verified and controlled before delivery.
This machine performs dry and wet friction cycles on cup surfaces. It verifies whether spray coating and printed patterns fade after abrasion.
It adopts paper tape to perform targeted surface friction tests. This equipment judges the surface color fastness of printed drinkware.
It takes micron-level readings on sprayed cup body surfaces. We control the overall coating thickness within a standard tolerance range.
It provides fixed-temperature water circulation for immersion tests. We verify the firmness of printed layers under set temperature conditions.
It outputs stable heat to heat up polymer accessories continuously. We check deformation and softening of rubber, silicone, and plastic parts.
This dedicated barrel heats and stores hot water on-site. It supplies hot water for finished cup static leakage inspection.
This high-precision tool captures real-time liquid temperature data. It supports accurate data recording for all heat retention tests.
It accurately records the opening and closing torque of all cup lids. We unify lid tightness and user hand feel for mass orders.
The chamber builds a high-salt and high-humidity corrosive atmosphere. We assess the rust resistance performance of metal and coated surfaces.
The chamber recreates customizable high and low temperature scenarios. It tests product stability under extreme ambient environments.
The table generates continuous cyclic vibration for sample simulation. It replicates real bumping conditions during bulk logistics transportation.
As your production manufacturer, we separate sampling ratios for trial orders, wholesale bulk, and corporate gift orders. Our inspectors pick samples from multiple shifts and molds rather than a single station. All samples carry batch & shift marks. Once defective items are found, we lock the problematic production section and re-inspect the whole batch before delivery to you.
We have a fixed calibration cycle for every testing instrument in our factory lab. Thermometers, coating thickness gauges, and torque testers are calibrated by standard reference blocks regularly. Calibration certificates are filed in our QC department. Any device out of calibration period stops testing immediately to avoid inaccurate data affecting your certification.
All non-conforming tumblers are labeled and isolated in independent zones separated from qualified stock. Irreparable products are scrapped with unified records. Reworkable goods must complete all five full lab inspection modules again after rework. We will never arrange unqualified finished goods into your shipment batches.
For your customized corporate gift bulk orders, we raise the sampling proportion of each test module, extend salt spray and UV aging test duration, and add extra cyclic vibration tests. After full inspection, we will send complete batch test reports to you synchronously.
Our factory benchmarks all aging, immersion, and material identification indicators against international food-grade limits. If you need third-party certification, we can extend test cycles and increase sampling frequency in advance to align our internal test thresholds with certification lab standards.
Our lab keeps the first qualified batch sample of your order as a permanent reference standard. Every subsequent production batch will be compared with the initial sample during inspection. If a continuous slight deviation appears, we will adjust production craft immediately and inform you of the optimization plan in advance.