Meaning
Cellular rubber material produced from liquid silicone elastomer through chemical or physical blowing agents creates a resilient structure known as a silicone sponge. Continuous extrusion or mold curing yields a lightweight matrix featuring interconnected or closed cells that retain elasticity across extreme thermal ranges. Automotive sealing assemblies, aerospace thermal barriers, and sensitive electronic enclosures utilize this compound to absorb mechanical shock while maintaining weather resistance.
Procurement specialists evaluate the density, compression deflection force, and permanent set values when sourcing commercial grades for long-term gasket applications.
Material Resilience
High temperature performance distinguishes this cellular polymer from standard organic rubbers. Continuous operating limits span from minus sixty degrees Celsius to over two hundred degrees Celsius without structural degradation or chemical breakdown. Thermal stability prevents the material from hardening or cracking during prolonged exposure to ultraviolet radiation and ozone.
Accelerated aging tests confirm that compression recovery rates remain stable after thousands of deflection cycles in harsh industrial environments.
Density Classification
Specifiers categorize the compound by specific gravity and firmness grades defined in international material standards. Lower density variants provide maximum compressibility for low closure force applications in electrical enclosures. Higher density formulations deliver increased tear resistance and tensile strength for heavy-duty industrial gaskets.
Compression deflection testing determines the exact force required to compress a specific sample by twenty five percent of its original thickness.
Compression Set
Permanent deformation resistance dictates the long term sealing efficacy of the component under sustained mechanical load. Standard laboratory methods measure the percentage of thickness loss after constant deflection at elevated temperatures for twenty two hours. Low compression set values indicate superior recovery capabilities that prevent fluid or air leakage over extended service intervals.
Gasket failure occurs when the material loses elastic memory and can no longer exert sufficient outward pressure against the mating flange.
