Radiation Resistance Characteristics of Phenyl Silicone

Phenyl silicone is a specially modified silicone rubber material. It can be categorized based on the phenyl content: low phenyl (5-10%), medium phenyl (10-20%), and high phenyl (over 30%). Among them, high-phenyl silicone rubber exhibits the most outstanding radiation resistance:
Radiation Resistance Parameters: After irradiation with 1000 kGy of cobalt-60 gamma rays, the material retained 75% of its tensile strength, demonstrating excellent radiation stability.

Temperature Adaptability: The elastic modulus remains stable from -196°C in liquid nitrogen to 350°C, meeting the extreme temperature requirements of the nuclear industry.

Molecular Structure Advantages: The introduction of phenyl groups disrupts the regularity of the siloxane molecular structure, reducing crystallinity while improving radiation and flame resistance.

Special Requirements for Materials in Nuclear Industry Sealing: Nuclear industry sealing materials must meet the following key performance indicators:

Radiation Resistance: Physical and chemical properties must remain stable in strong radiation environments to avoid aging or embrittlement.

Temperature Resistance: Required to withstand the high temperatures and pressures found within nuclear power plants (typically hundreds of degrees Celsius).
Seal Reliability: Maintains good elasticity and sealing performance even under long-term radiation exposure.
Chemical Stability: Resists various chemical corrosion effects from nuclear reactions.

Performance Comparison
Performance Indicators:                     Phenyl Silicone Rubber                Standard silicone rubber               EPDM rubber
Radiation resistance (1000 kGy):          75% tensile retention                  significantly decreased                    medium
Operating temperature range:                 -196°C to 350°C                           -55°C to 200°C                    -50°C to 150°C
Chemical resistance:                                    Excellent                                       Good                                    Fair
Long-term stability:                                     Excellent                                        Good                                Medium