Why We Choose 304 Stainless Steel for Our Insulated Drinkware

At LOT (Prosundrinkware Co., Ltd.), we understand that when you invest in an insulated cup, you want it to be safe, durable, and easy to maintain. One of the most frequent questions we receive from our buyers is: What specific food-grade stainless steel do you use and why? As a specialized factory with over a decade of experience producing stainless steel insulated cups, we take material selection very seriously. Here’s a detailed look at our choice.

Our Standard: 304 Food-Grade Stainless Steel

All our water bottles, tumblers, mugs, and food jars are manufactured using 304 stainless steel (also known as 18/8 stainless steel). This grade is widely recognized as the industry benchmark for food contact applications. Here’s why we stick with 304:

• Food Safety First – 304 stainless steel contains 18% chromium and 8% nickel, which creates a passive chromium oxide layer that prevents metallic migration into your beverages or food. It is certified food-grade and complies with international standards (e.g., FDA, EU regulations).
• Superior Corrosion Resistance – Whether you fill your cup with acidic coffee, lemon water, or sports drinks, 304 steel resists rust and pitting. No strange metallic taste, no degradation over time.
• Excellent Durability – Our insulated cups undergo rigorous drop tests and pressure tests. 304 steel offers the perfect balance of hardness and formability, ensuring your cup stays dent-resistant while maintaining its vacuum insulation integrity.
• Easy to Clean & Hygienic – The non-porous surface of 304 stainless steel doesn’t harbor bacteria. It’s dishwasher-safe and resistant to staining, so you can maintain a fresh-smelling cup with minimal effort.
• Long-Lasting Insulation – The vacuum insulation technology we use works best with 304 steel. It retains heat/cold for hours without compromising the material’s structural stability.

What About 316 Stainless Steel?

While we focus on 304 as our primary material, we can also produce custom orders using 316 stainless steel upon request. 316 contains molybdenum, which offers even higher corrosion resistance against chlorides (e.g., saltwater). However, for everyday use like coffee, tea, water, and juice, 304 is more than sufficient and provides the best cost-performance ratio for our clients.

Our Commitment to Quality

As a factory that helps clients reduce costs, enhance product quality, and expand market reach, we never compromise on material. Every batch of stainless steel we purchase is certified and traceable. Our 3D customization service (17 customizable 3D models) allows you to apply logos or patterns directly on the cup surface without affecting the food-grade safety.

Still Have Questions?

If you’d like to know more about our specific grades, testing reports, or customization options, feel free to contact us at [email protected] or call +86 19157630956. We’d love to help you choose the perfect insulated cup for your brand.