Explore our flagship OEM/ODM double-wall vacuum insulated flasks, tumblers, and hydration bottles engineered for global market compliance.
Wuyi Dongyi Dailysupplies Co., Ltd is strategically situated in the industrial epicenter of Wuyi County, Zhejiang Province, China. As a premier manufacturer and technical innovator, we specialize in the continuous research, metallurgical design, and high-volume production of premium food-grade stainless steel drinkware.
Our comprehensive production spectrum encompasses double-walled vacuum insulation bottles, single-wall hydration containers, ergonomic travel tumblers, specialized coffee mugs, and heavy-duty thermal jugs. Engineered with advanced automated machinery, rigorous laser-welding systems, and strict internal quality assurance, our products set the global benchmark for thermal efficiency and mechanical durability.
Every batch undergoes rigorous quality audits compliant with CE compliance frameworks, EU Regulation (EC) No 1935/2004, and US FDA food contact standards.
Understanding the metallurgical, mechanical, and thermal parameters required to manufacture world-class CE-certified stainless steel hot water flasks.
Double-wall thermal retention relies on creating a high-vacuum boundary ($10^{-2}$ to $10^{-4}$ Pa) between an inner and outer stainless steel liner. This eliminates conductive and convective heat transfer. To further arrest radiant thermal dissipation, inner liners are coated with electrolytic copper plating, reflecting infrared heat waves back into the stored liquid.
We utilize certified Premium Austenitic 18/8 (SUS304) Stainless Steel for standard liquid contact, alongside medical-grade SUS316 for enhanced acid and alkali resistance. These non-reactive alloys prevent metallic leaching, preserve beverage taste profiles, and ensure long-term structural anti-corrosion compliance.
CE marking on stainless steel hot water flasks validates compliance with European health, safety, and environmental protection standards. This encompasses structural pressure integrity under high liquid temperatures, BPA-free/Phthalate-free food polymer seals, non-toxic powder coating finishes, and mechanical drop-test resistance.
| Parameter | Technical Specification | Industry Standard | Wuyi Dongyi Quality Benchmark |
|---|---|---|---|
| Material Composition | Food-grade Austenitic Stainless Steel (SUS304 / SUS316) | GB4806.9-2016 / ASTM A240 | 100% Spectrometer Inspected 18/8 Stainless Steel |
| Thermal Retention (Hot) | ≥ 68°C after 6 Hours (Initial liquid temperature: 98°C) | BS EN 12546-1:2000 | ≥ 72°C after 6 Hours / ≥ 58°C after 12 Hours |
| Cold Insulation Performance | ≤ 9°C after 12 Hours (Initial liquid temperature: 0°C ice mix) | ISO 18991 Industrial Standard | ≤ 6°C after 12 Hours / ≤ 10°C after 24 Hours |
| Vacuum Tech & Sealing | Pipeless High-Vacuum Degassing with Glass Bead Sealing | Standard Vacuum Oven Degassing | Ultra-high vacuum degassing at 1050°C vacuum furnace |
| Surface Finishing | Electrostatic Powder Coating / Thermal Transfer / Hydrographics | Cross-Hatch Adhesion Test Class 1 | Class 0 Adhesion, UV-Resistant Non-fade Coating |
Why international enterprise buyers choose Wuyi, Zhejiang as their primary supply chain hub for OEM and ODM thermal bottle production.
Located in Zhejiang Province, our facility gains immediate access to raw material steel mills, specialized precision tube-drawing factories, silicone seal molders, and eco-friendly packaging suppliers. This dense industrial cluster dramatically lowers production lead times and raw material freight costs.
China's drinkware sector has transitioned to Industry 4.0 automation. Our factory integrates robotic laser welding, automatic vacuum extraction lines, computerized powder coating booths, and high-speed mechanical necking machines, ensuring micrometer precision across million-unit production runs.
With massive daily output capacity, Chinese hot water flask factories provide unbeatable unit cost economics without sacrificing material quality. Bulk raw material purchasing power allows us to offer premium 304/316 SS vessels at competitive wholesale price points for international brand distributors.
Staying ahead of consumer shifts, environmental regulations, and smart thermal technology innovations.
Global consumer demand is pivoting away from single-use plastics toward endlessly recyclable 18/8 stainless steel flasks. Advanced factories are now adopting PCR (Post-Consumer Recycled) stainless steel to minimize embodied carbon footprints.
Incorporating micro-LCD touch lids with real-time temperature sensors and LED hydration reminders. These smart thermal flasks bridge the gap between traditional hardware and modern digital wellness technology.
Through specialized spin-forming and chemical thinning techniques, wall thickness is reduced down to 0.12mm without compromising structural strength or vacuum longevity, yielding feathersoft travel flasks.
Multi-functional lids with integrated silicone straws, quick-flip sport spouts, magnetic cap holders, and leak-proof locking mechanisms cater to diverse active outdoor and office commuter lifestyle scenarios.
Tailored flask configurations designed for specialized regional consumer markets and regional beverage traditions.
Heavy-duty, wide-mouth 40oz and 64oz flasks featuring rugged powder coating and carabiner handles. Built to maintain hot soups or steaming beverages during sub-zero mountain expeditions, or icy water during desert treks.
Sleek, slim-profile 20oz skinny tumblers and egg-shaped cups designed to fit seamlessly into standard vehicular cup holders and business briefcase pockets. Sweat-proof double-wall construction prevents condensation damages.
Engineered for specific beverage rituals, such as our 8oz OEM Yerba Mate Gourds equipped with bombilla straw compatibility, and specialized vacuum beer mugs designed to maintain optimal carbonation and chill.
From custom 3D CAD modeling to CE-certified mass production and global freight delivery.
Submit specific capacity, thermal rating, and logo requirements.
Receive detailed engineering drawings and volume tier pricing.
Rapid 3D printing and physical stainless steel sample validation.
Automated hydraulic shaping, laser welding, and vacuum baking.
100% vacuum temperature testing, leak testing, and surface inspection.
FOB, CIF, or DDP delivery with full export compliance docs.
Browse our complete production line of vacuum insulated tumblers, outdoor sports flasks, and custom beverage containers.
Direct technical insights provided by senior metallurgical engineers and international quality control directors.
CE Certification for hot water flasks verifies compliance with EU health, safety, and environmental standards. Key criteria include EU Regulation (EC) No 1935/2004 for materials coming into contact with food, heavy metal leaching tests (Lead, Cadmium, Chromium, Nickel), thermal resistance under boiling temperatures without structural deformation or hazardous off-gassing, and leak-tight pressure resistance during rapid thermal cycles.
304 Stainless Steel (18/8) contains 18% Chromium and 8% Nickel, providing outstanding structural strength and corrosion resistance suitable for water, coffee, and tea. 316 Stainless Steel adds 2-3% Molybdenum, significantly elevating resistance to chlorides, acidic fruit juices, and carbonated sport drinks. We offer both alloys based on brand positioning and cost targets.
We utilize high-temperature vacuum baking furnaces operating at 1050°C combined with lead-free glass bead sealing techniques. Furthermore, an internal zirconium getter material is inserted within the vacuum cavity to continuously absorb residual oxygen and moisture micro-molecules over the product lifetime, preventing vacuum degradation.
Our complete OEM/ODM services include custom surface finishing (powder coating, matte rubberized spray, gradient electroplating, 3D UV printing, water transfer), laser-etched or embossed logos, custom silicone lid mold creation, pantone-matched plastic accents, and bespoke retail box design.
Standard custom branding MOQs begin at 1,000 units per color/design for stock vessel shapes. For completely custom ODM mold designs, MOQs typically range from 3,000 to 5,000 units. Production lead times average 25 to 35 days following sample approval and deposit receipt.
Select any product below to access detailed technical datasheets, CAD specifications, and bulk factory quotes.
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