Food grade silicone sheets are widely used in food equipment for sealing and cushioning. However, some customers may experience deformation after long-term use.

Recently, one customer reported:

"The silicone sheet worked well at first, but after several months, it could not fully recover after compression, causing slight air leakage."

This issue is commonly caused by long-term pressure, high working temperatures, or incorrect silicone hardness selection.

Common Causes

1. Long-Term Compression

Continuous pressure can reduce the silicone's rebound ability over time, leading to permanent deformation.

2. Excessive Temperature

If the silicone sheet operates beyond its recommended temperature range for a long time, the material may harden and lose elasticity.

3. Incorrect Hardness

Silicone that is too hard may reduce sealing performance and flexibility.

Solutions

Solution 1: Adjust Silicone Hardness

For most food equipment sealing applications, 50–60 Shore A hardness is recommended for better flexibility and sealing performance.

Solution 2: Optimize Structural Design

Reducing over-compression and improving pressure distribution can help extend service life.

Solution 3: Upgrade Silicone Material

Using high-resilience or platinum-cured silicone can improve recovery performance and reduce long-term deformation.

Conclusion

Proper material selection and structural design are important for maintaining stable sealing performance in food-grade silicone sheet applications.