If you are searching for a vacuum flask manufacturer in China, you are looking in the right place. China produces over 80% of the world's vacuum-insulated drinkware, and the vast majority comes from one city: Yongkang, Zhejiang Province — where Hongming has been manufacturing since 2015.
Whether you call it a vacuum flask, insulated flask, thermos flask, water bottle, or tumbler — the manufacturing process, materials, and sourcing strategy are the same. This guide covers how to find, evaluate, and work with a Chinese vacuum flask manufacturer for wholesale and OEM orders.
Vacuum Flask vs Tumbler vs Bottle: Same Factory, Different Names
One of the most common points of confusion for international buyers is terminology. Here is how the same product is described in different markets:
| Market | Common Term | Typical Format |
|---|---|---|
| USA & Canada | Tumbler, insulated tumbler | Open top, straw lid, handle |
| UK & Europe | Vacuum flask, insulated flask | Screw cap or pour lid |
| India & Middle East | Flask, thermos flask | Screw cap, sometimes with cup |
| Australia & NZ | Flask, drink bottle, keep cup | Various formats |
| Japan & Korea | Stainless bottle, mug bottle | Slim, lightweight |
At the factory level, all of these products use the same core technology: double-wall vacuum-insulated stainless steel construction. The differences are in shape, lid type, and target use case. When communicating with a Chinese manufacturer, describing your product as "double wall vacuum insulated stainless steel [shape]" eliminates any confusion.
What Makes Yongkang the World's Vacuum Flask Capital
Yongkang has been producing metal products for over 800 years. In the past three decades, the city specialized in vacuum-insulated drinkware and built the world's most complete supply chain:
- 3,000+ drinkware manufacturers ranging from small workshops to large factories with 500+ workers
- Stainless steel mills within 50km — 304 and 316 grade coils delivered same-day
- Component ecosystem: Lids, straws, handles, gaskets, packaging — all sourced locally
- Finishing specialists: Powder coating, electroplating, UV printing, heat transfer facilities
- Testing infrastructure: Government-certified and SGS/TUV-affiliated testing centers
- Logistics: 2.5 hours to Ningbo Port, 3.5 hours to Shanghai Port by highway
This concentration means lower costs (no shipping between suppliers), faster production (components available next-day), and better quality control (every part of the supply chain is within driving distance for inspection).
How to Evaluate a Vacuum Flask Manufacturer
With 3,000+ manufacturers in Yongkang alone, selecting the right partner requires systematic evaluation. Here is our recommended checklist:
Production Capability
- Daily production capacity (how many pieces per day?)
- Product range — do they make the specific format you need?
- Existing molds available — can you select from their catalog or need new molds?
- In-house vs outsourced finishing — factories that do powder coating and printing in-house offer better quality control
Quality Systems
- Vacuum testing method — helium leak detector is the gold standard
- Material certificates — can they provide Mill Test Certificates for 304/316 steel?
- Third-party certifications — FDA, LFGB, CE, BSCI?
- QC process — do they test 100% of production or only samples?
Business Reliability
- Years in operation — newer factories have less experience with export requirements
- Export experience — do they regularly ship to your target market?
- Communication — can they respond in English within 24 hours?
- Sample capability — can they produce branded samples within 5-7 days?
Hongming Factory Profile
| Detail | Hongming |
|---|---|
| Founded | 2015 |
| Location | Yongkang, Zhejiang, China |
| Workers | 50+ |
| Daily Capacity | 5,000+ pieces |
| Product Range | Car tumblers, kids cups, beer tumblers, office mugs, outdoor bottles, ice buckets, shot glasses, cocktail shakers |
| Materials | 304 & 316 stainless steel |
| Certifications | FDA, LFGB, BSCI, CE, ROHS |
| MOQ | 100 pieces (logo printing), 3,000 pieces (custom mold) |
| Lead Time | 15-25 days standard, rush available |
| Shipping | FOB Ningbo / Yiwu |
Importing Vacuum Flasks: Step-by-Step Process
- Define your product: Choose format (tumbler/flask/bottle), size, material grade (304 or 316), finish, and branding requirements.
- Request quotes: Contact 3-5 manufacturers with identical specifications for fair comparison. Contact Hongming here →
- Order samples: Test quality, insulation performance, and finish. Budget $30-$80 for samples including shipping.
- Negotiate terms: Price, MOQ, payment terms (typically 30% deposit + 70% before shipping), lead time.
- Production + QC: Monitor production timeline. Request in-process photos and pre-shipment inspection (PSI).
- Shipping: Choose FOB (you arrange freight) or CIF (factory arranges freight). Sea freight from Ningbo takes 15-30 days to most international ports.
- Customs clearance: Ensure your products have the required import documentation: commercial invoice, packing list, bill of lading, and relevant food-safety certificates for your market.
Pricing Reference: Vacuum Flask FOB Prices
| Product | 100-499 pcs | 500-2,999 pcs | 3,000+ pcs |
|---|---|---|---|
| 30oz Tumbler (304SS) | $4.20-$5.00 | $3.50-$4.20 | $3.00-$3.80 |
| 500ml Flask (304SS) | $3.80-$4.50 | $3.20-$3.80 | $2.80-$3.50 |
| 750ml Sport Bottle | $4.50-$5.50 | $3.80-$4.50 | $3.20-$4.00 |
| 12oz Kids Cup (316SS) | $3.80-$4.80 | $3.20-$4.00 | $2.80-$3.50 |
Prices include standard powder coating. Custom logo, special colors, and packaging are additional. See our detailed tumbler pricing guide →
Request a quote for vacuum flasks → Tell us your target product, quantity, and destination country. We respond within 12 hours with pricing and product recommendations.
Related guides: How to Find the Right Tumbler Factory in China | First Order from China Step-by-Step | Quality Control & Testing Guide