Tensile Strength
Conventional phenyl silicone rubber: The tensile strength ranges from 4.9 to 78 MPa, depending on the vulcanization type and filler system.
1 For example, the tensile strength of general-purpose vinyl silicone rubber is 11.8 to 13.7 MPa, while high-strength formulations can be increased to 14 MPa by silica filling.
Special-purpose phenyl silicone rubber: For example, radiation-resistant phenyl silicone rubber has a tensile strength of 8.4 MPa when unirradiated, but this may drop to 4.2 MPa after high-dose irradiation.
Elongation at Break
General-purpose: The elongation at break is typically 200% to 300%, with some highly elastic formulations reaching 500% to 800%.
Radiation-resistant: The elongation is 200% when unirradiated, but may drop to 20% to 50% after irradiation. Testing Standards
Tensile Properties: Tested in accordance with GB/T 528 or ISO 37 using dumbbell-shaped specimens on a universal testing machine at a tensile speed of 500 mm/min.
Special Requirements: Food-grade/medical silicone rubber must meet higher standards, such as tensile strength ≥ 7 MPa and elongation at break ≥ 400%.
The properties of phenyl silicone rubber are significantly affected by phenyl content, crosslink density, and fillers (such as silica).