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Stainless Steel Vacuum Flask Manufacturer & OEM Supplier

 

 

Kairun manufactures stainless steel vacuum flasks for wholesalers, distributors, retailers and private label brands worldwide. Our product range includes vacuum flasks for retail, promotional, hospitality and outdoor markets, with both standard models and custom OEM solutions available.

 

From material selection and product development to production, quality inspection and packaging, every order follows a standardized manufacturing process. This helps ensure consistent product quality, stable lead times and reliable supply for long-term business partnerships.

 

 
 
Explore Our Core Vacuum Flask Series

 

Series Name

Best For

Technical Specifications

Key Advantage

Classic Bullet Flasks

Outdoor adventures, hiking, and everyday commuter use

Capacity ranges from 350ml to 1000ml; traditional bullet shape for easy grip; classic threaded stopper

High durability with classic styling and high-volume cost efficiency

Wide-Mouth Sports Water Bottles

Fitness enthusiasts, gym-goers, and active lifestyles

Wide mouth opening accommodates ice cubes easily; equipped with a flexible carry handle or straw lid

Sweat-proof exterior powder coating that resists scratches and provides a secure grip during movement

Travel Coffee Mugs & Tumblers

Office workers, vehicle commuters, and coffee shops

Ergonomic design fits standard car cup holders; slide-lock or flip-top splash-proof lids

Maintains coffee temperature for hours without transferring heat to the outer walls

Smart Temperature Display Flasks

Modern gift markets and tech-forward lifestyle brands

Integrated LED lid displays liquid temperature at a touch; long-lasting internal battery

Adds high-perceived value to promotional product lines

 

Material Safety & Thermal Performance Standards

 

Metallurgical Foundation: Certified JIS SUS304 (18/8) stainless steel is selected for standard production, while SUS316 is available for products intended for acidic beverages or premium applications. Each steel batch is verified by spectrometer analysis before production.

 

Vacuum Insulation Physics: Thermal insulation performance is achieved through a multi-stage manufacturing process that minimizes heat transfer by conduction and convection.

 

Mechanical Spin-Forming: Shells are drawn to strict wall-thickness tolerances to minimize weak spots.

 

High-Temperature Brazing: Copper-free brazing rings are fused in a controlled atmosphere furnace.

 

High-Vacuum Exhaust & Sealing: Flasks undergo high-temperature vacuum baking and evacuation inside industrial furnaces to strip residual cavity gases, minimizing thermal conduction and convection. This maintains liquids hot for up to 12 hours and cold for up to 24 hours without chemical additives.

Double Wall Stainless Steel Vacuum Bottle

 

 
 
OEM & Private Label Customization Services
01.

Visual Branding

Logo customization is available through laser engraving, silk-screen printing and embossed branding to match different market positioning.

02.

Surface Finish

Matte powder coating, metallic finishes, rubber coating and customized Pantone colors are available across most bottle models.

03.

Structural Development

Bottle capacity, body profile, and lid structure can be modified. Exclusive tooling projects normally begin with 3D design verification prior to mold production.

04.

Accessories & Packaging

Retail-ready packaging, instruction manuals, hang tags, barcode labels and customized accessories can be developed together with the product.

 

Streamlined OEM & ODM Partnership Process

 

Requirement Analysis (Day 1-2)

Share concepts, volumes, and target markets; engineering feasibility review.

Quotation & NDA (Day 3-4)

Transparent cost breakdown (tooling, tiers, packaging) and NDA signing.

Rapid Prototyping (Day 5-20)

3D drawings, custom mold development, and physical sample delivery.

Bulk Production (Day 13-35)

Deep-drawing, automated TIG welding, vacuum processing, with regular video/photo updates.

Quality Control & Inspection

Spectral analysis, thermal retention testing, and support for third-party inspections (SGS/TÜV).

Logistics & Delivery

Drop-test compliant packaging, FCL/LCL shipping, and Amazon FBA prep.

 

 
Manufacturing Process

Blanking & Drawing

Steel coils are stamped and deep-drawn into uniform inner and outer cylinder shells.

Robotic TIG Welding

Inner bases and outer bodies are joined via automated TIG welding under an argon shield to prevent oxidation.

Vacuum Processing

Assembled shells are processed in multi-zone vacuum furnaces to extract inter-wall air before the seal port is closed.

Internal Finishing

Inner walls undergo mechanical grinding and electropolishing to create a smooth, stain- and bacteria-resistant surface.

 

Strict Quality Control & Global Compliance

 

Multi-Stage Quality Assurance

Metallurgical Verification: Spectral analysis on every steel coil to verify exact nickel and chromium content prior to production.

Vacuum Integrity Screening: Automated pressure and thermal screening on every sealed body to guarantee 12-hour heat and 24-hour cold retention.

Coating Durability: Rigorous ASTM D3359 cross-hatch adhesion, pencil hardness, and drop testing for scratch-resistant finishes.

Global Regulatory Safety

Food-Contact Compliance: 100% BPA-Free and free from heavy metals (lead and cadmium), fully compliant with FDA CFR 21 (North America) and LFGB / (EC) No 1935/2004 (Europe).

Third-Party Verification: Independent test reports from SGS or TÜV available upon request, backed by full batch traceability.

Social Accountability: Regular facility audits ensuring ethical labor practices and full ESG supply chain transparency.

Stainless Steel Double Wall Vacuum Flask

 

Transparent Project Management: From Initial Inquiry to Final Delivery
 

Rapid Prototyping & Sampling

Custom inquiries answered within 24 hours. Physical or digital prototypes delivered in 7 to 10 days for evaluation before bulk production.

Milestone Progress Updates

Dedicated account coordinators provide structured photo and video updates covering material prep, molding, vacuum testing, and packaging.

Pre-Shipment Inspection (PSI)

Strict internal quality checks before balance payments, with open inspection reports and full welcome for third-party agencies like SGS or Bureau Veritas.

Responsive After-Sales Support

Prompt handling of any transit or production issues to protect your local distribution schedule.

 

Packaging, Logistics & Warehousing Solutions

 

 

Drop-Test E-Commerce Packaging

Reinforced, multi-layer corrugated boxes and drop-tested gift boxes designed to withstand rigorous last-mile delivery and minimize transit damage.

 

Amazon FBA & Retail Prep

Full pre-shipment prep including free barcode labeling, custom carton marks, and compliance with Amazon FBA or global retail standards.

 

Flexible Global Shipping

Cost-effective FCL, LCL, and air-freight options coordinated with reliable logistics partners to deliver directly to ports or overseas warehouses.

 

 

 

FAQ

 

Q: What is your typical MOQ for OEM/ODM orders?

A: Generally 5,000 pieces per model/color, but we offer flexible trial order quantities to support new product launches.

Q: What is the standard production lead time?

A: Bulk production takes 25 to 35 days after sample approval and deposit receipt. Rush orders can be accommodated upon request.

Q: Do you provide free samples for quality evaluation?

A: Yes, existing catalog samples are free of charge, with freight collect. Custom pre-production samples incur a reasonable setup fee, refundable upon bulk order.

Q: What payment terms do you accept?

A: We typically accept T/T (30% deposit, 70% balance against the copy of B/L or after Pre-Shipment Inspection), and L/C at sight for long-term partners.

Q: How do you handle shipping and logistics?

A: We support FOB, CIF, and DDP terms, cooperating with reliable freight forwarders to ship via sea or air to global ports and Amazon FBA warehouses.

Q: What is your standard procedure if defective products are found upon arrival?

A: If any manufacturing defect is verified through photos, videos, or third-party inspection reports upon delivery, we provide immediate replacement or credit compensation in your next shipment.

Q: What is your capacity for peak-season or urgent orders?

A: We maintain pre-stocked raw materials and flexible production lines, allowing us to allocate dedicated shifts to meet tight holiday deadlines or rush schedules.

Q: Do you offer replacement parts for your vacuum flasks?

A: Yes, we can supply spare components such as extra lids, silicone sealing rings, and carrying straps to support your after-sales service and retail accessory bundles.

Q: What file formats do you require for custom logo and packaging design?

A: We accept vector files in AI, PDF, or EPS formats with outlined fonts to ensure precise laser engraving, silk-screen printing, and packaging layout.

As one of the most professional stainless steel vacuum flask suppliers in China, we're featured by quality products and good service. Please rest assured to wholesale customized stainless steel vacuum flask made in China here from our factory. Welcome to contact us for more cheap products.

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