Comparison of Low-Temperature Performance Parameters
Phenyl vinyl and methyl vinyl raw rubbers exhibit significant differences in low-temperature performance:

Phenyl Vinyl Raw Rubber: Low-temperature resistance up to -73℃. Low-phenyl silicone rubber (phenyl content 5-10%) maintains elasticity at -70~-100℃. It has the best low-temperature performance among all rubbers.

Methyl Vinyl Raw Rubber: Conventional low-temperature resistance is -50~-60℃. Low-temperature type reaches -120℃ (special formulation). Suitable for long-term use in environments from -60℃ to 250℃.

Performance Indicators:
Phenyl Vinyl Raw Rubber
Methyl Vinyl Raw Rubber
Minimum Operating Temperature: -73℃ (Conventional)
-60℃ (Conventional)
Special Formulation Low Temperature: -100℃
-120℃
Long-Term Operating Temperature Range: -70~180℃
-60~250℃
Excellent Low-Temperature Elasticity Retention Good Low-Temperature Application Characteristics Analysis
Low-Temperature Advantages of Phenyl Vinyl Raw Rubber

Molecular Structure Characteristics:
Phenyl enhances the stability of the siloxane backbone through steric hindrance and electronic effects, reducing slippage and rearrangement of rubber molecular chains at low temperatures, and minimizing entropy reduction after stress removal.

Application Performance: Maintains good elasticity below -70℃; Low compression set; Suitable for seals in extreme low-temperature environments.
Low-Temperature Characteristics of Methyl Vinyl Raw Rubber
Molecular Structure Characteristics: Methyl vinyl structure provides good flexibility; High degree of freedom of molecular chain movement; Moderate low-temperature performance in conventional formulations.
Application Performance: Stable performance above -60℃; Better processing performance than phenyl vinyl; Relatively lower cost. Low Temperature Application Recommendations

Extreme Low Temperature Environments (below -70℃):
Phenyl vinyl rubber is the preferred choice. Particularly suitable for aerospace, polar research, and other applications. It is recommended that the phenyl content be controlled at 5-10 mol% for optimal low temperature performance.

Regular Low Temperature Environments (-60℃ to -70℃):
Phenyl vinyl rubber performs better. Methyl vinyl rubber can meet basic requirements. A trade-off must be made based on cost and performance requirements.

Wide Temperature Range Applications (-60℃ to high temperatures):
Conclusion: In low-temperature applications, phenyl vinyl rubber, with its superior low-temperature performance (up to -73℃ or even -100℃), significantly outperforms methyl vinyl rubber's conventional -60℃ low-temperature limit. For extreme low-temperature environments or applications with stringent low-temperature performance requirements, phenyl vinyl rubber is a more suitable choice. However, methyl vinyl rubber still has advantages in cost, processing performance, and general low-temperature applications, making it suitable for occasions with less stringent temperature requirements. In practical selection, factors such as operating temperature range, performance requirements, and cost budget should be comprehensively considered.