Phenylvinyl silicone rubber (PVMQ) and all-methyl raw rubber (MQ) differ significantly in processing and mechanical properties. The core difference lies in the introduction of phenyl groups, which gives PVMQ superior low-temperature and radiation resistance, while MQ focuses more on basic temperature resistance.

Processing Performance Comparison
All-methyl raw rubber (MQ): Lower vulcanization activity and relatively poor processing performance, potentially requiring higher temperatures or longer vulcanization times during processing.

Phenylvinyl silicone rubber (PVMQ): Due to the introduction of phenyl groups, its processing requires stricter monomer purity and technical conditions, resulting in higher costs. However, by adjusting the phenyl content (e.g., low phenyl, medium phenyl, high phenyl), processing performance can be optimized for different applications.

Mechanical Property Comparison
All-methyl raw rubber (MQ): As a basic silicone rubber, its tensile strength, hardness, and other mechanical properties are relatively conventional, with a wide temperature range, but its low-temperature performance is generally average.

Phenyl vinyl silicone rubber (PVMQ): The addition of phenyl groups significantly improves its low-temperature resistance (e.g., low-phenyl PVMQ maintains elasticity at -100°C) and radiation resistance, while also exhibiting excellent compressive strength (above 0.65 at -70°C). However, its tensile strength and elongation may be slightly lower than MQ.

Application Selection: For applications requiring operation in extreme low-temperature or radiation environments, such as aerospace and polar equipment, phenyl vinyl silicone rubber is a better choice.

For applications with high temperature resistance requirements and cost sensitivity, such as general seals and insulation materials, all-methyl raw rubber offers better value for money.

Would you like me to compile a detailed selection comparison table for you? It can quickly match your specific application scenarios and performance requirements.