There are a number of issues that can be faced with cryogenic sealing products, some of which may be related to the properties of the material. In low temperature environments, some common problems include:

Hardening problem: Some sealing materials may harden and lose elasticity at low temperatures, resulting in reduced sealing performance.
Embrittlement Issues: Some materials can become brittle at low temperatures and easily crack or break.
Volume Change: Some materials may undergo volume changes at low temperatures, resulting in a weak seal or gaps.
Adhesion Issues: Some materials may lose adhesion at low temperatures and become unable to adhere to surfaces effectively.

Phenyl vinyl silicone rubber is a silicone rubber with excellent properties that may help solve the above problems. Some of its features include:

Low temperature resistance: Good low temperature elasticity, not easy to harden or embrittle.
Anti-brittleness: It has certain resistance to embrittlement at low temperatures, reducing the risk of cracking.
Excellent sealing performance: It has good sealing performance and can fill surface gaps to prevent media penetration.
Adhesion: Still maintains good adhesion at low temperatures, ensuring that the sealing material adheres tightly to the surface.

However, please note that the final choice still depends on the specific application environment and requirements. Before selecting a sealing material, detailed material testing and evaluation is recommended to ensure it will perform well under actual use conditions.