Phenyl silicone rubber, due to its unique molecular structure and excellent physicochemical properties, has become an ideal choice for sealing materials in cryogenic cold storage. Its applicability is analyzed in detail below from several aspects:

Advantages of Phenyl Silicone Rubber in Low-Temperature Performance
Phenyl silicone rubber, by introducing phenyl groups, disrupts the regularity of the dimethylsiloxane structure, significantly reducing the polymer's crystallization temperature and glass transition temperature. Low-phenyl silicone rubber (phenyl content 5-10%) can harden to -115℃ and maintains elasticity in environments ranging from -70 to -100℃. Medium-phenyl silicone rubber (phenyl content 10-20%) combines excellent cold resistance and self-extinguishing properties. This superior low-temperature performance enables it to meet the sealing requirements of cryogenic cold storage (typically -45 to -60℃).

Meeting the Sealing Requirements of Ultra-Low Temperature Cold Storage
Ultra-low temperature cold storage places special requirements on sealing materials:
Extreme Low Temperature Resistance: The material must not harden or become brittle below -60℃.
Elasticity Retention: It must maintain its sealing performance continuously during low-temperature cycling.
Chemical Stability: It must resist the chemical corrosion of refrigerants and storage media.
Abrasion Resistance: It must withstand the mechanical wear from frequent opening and closing of the door.
Thermal Insulation Performance: It effectively prevents cold air leakage.
Phenyl silicone rubber excels in these aspects, exhibiting low compression set, a wide operating temperature range, and excellent oxidation resistance, weather resistance, shock resistance, and moisture resistance.

Comparison with Other Sealing Materials
Material Type | Applicable Temperature Range | Low Temperature Performance | Chemical Stability | Abrasion Resistance
Nitrile Rubber | -30℃ to +80℃ | Poor | Average | Good
Fluororubber | -20℃ to +200℃ | Medium | Excellent | Excellent
Ordinary Silicone Rubber | -55℃ to +200℃ | Good | Excellent | Good
Phenylene Silicone Rubber | -100℃ to +200℃ | Excellent | Excellent | Good

As can be seen from the comparison, phenyl silicone rubber exhibits the best overall performance in ultra-low temperature environments.

Chemical Stability and Safety of Phenylene Silicone Rubber
Phenylene silicone rubber possesses excellent chemical inertness and will not react with chemicals in cold storage, ensuring long-term stability. Furthermore, phenyl silicone rubber has self-extinguishing properties, allowing it to self-extinguish in case of fire, thus improving the safety of cold storage. This material also has good electrical insulation properties, making it suitable for applications requiring electrical isolation.

Practical Application Cases
Phenylene silicone rubber has been widely used in sealing components for extreme environments such as aerospace, including sealing components of equipment such as the "Tianhe Core Module". In the industrial sector, Shandong University's high-purity methylphenyl cyclic compound technology has been commercialized. These successful cases have verified the reliability of phenyl silicone rubber under extreme temperature conditions.