What are the types of materials for thermos cup seals?

What are the types of materials for thermos cup seals?
As an important component of thermos cups, the material of thermos cup seals directly affects the sealing performance and safety of use of thermos cups. According to the search results, the following are several common types of thermos cup seals.

1. Silicone
Silicone seals are the most commonly used sealing materials in thermos cups. It uses 100% food-grade silicone as raw material, with high transparency, strong tear resistance, aging resistance and no stickiness. Food-grade silicone seals not only meet international food safety standards, but also maintain stable performance in a wide temperature range of -40℃ to 230℃, ensuring effective operation in various environments

2. Rubber
Rubber seals, especially nitrile rubber (NBR), are suitable for use in media such as petroleum hydraulic oil, glycol hydraulic oil, diester lubricating oil, gasoline, water, silicone grease, silicone oil, etc. It is currently the most widely used and lowest-cost rubber seal

3. PVC
PVC (polyvinyl chloride) is also a material used to make seals. However, PVC is limited in its use in food-grade applications because it may release harmful substances at high temperatures

4. Tritan
Tritan is a new type of plastic material that is bisphenol A-free during production and has good heat and chemical resistance, so it is also used in the manufacture of thermos seals

The importance of seals
Although seals may seem inconspicuous, they play a pivotal role in ensuring the temperature of beverages, preventing liquid leakage, and improving user experience. High-quality silicone seals can ensure that the temperature of the thermos does not drop by more than 10°C within 6 hours after the thermos is filled with hot water, effectively extending the insulation time of the beverage

Working principle of seals
The working principle of thermos seals is based on elastic deformation and contact pressure. When the thermos lid is tightened, the seal is squeezed and deformed, and its surface forms a close contact surface with the thermos lid and the cup body, thereby effectively preventing liquid leakage

Conclusion
In summary, silicone, rubber, PVC and Tritan are the main materials for thermos seals. Among them, silicone has become the most popular and commonly used sealing ring material for thermos cups due to its high temperature resistance, aging resistance, and non-toxicity. With the development of technology and market demand, more new materials may be developed in the future to meet higher performance requirements and environmental protection standards.