Technical datasheet

FE-251-U

Supplied byShin-Etsu- Last Updated on Sep 3, 2025

FE-251-U by Shin-Etsu is a fluorosilicone rubber by Shin-Etsu, containing 0.8 of C-8A curing agent. It is highly resistant to high & low temperatures, solvents, oil, flex fatigue and silicone fluids. Shows excellent workability. FE-251-U is suitable for processing by compression moldng. Used in flame-resistant diaphragms, check valves, gaskets and O-rings.
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FE-251-U properties

Mechanical properties

PropertiesValue & unitTest conditionTest method
100% Modulus0.0 Visible After LoginVisible After LoginVisible After Login
200% Modulus0.0 Visible After LoginVisible After LoginVisible After Login
Compression Set0.0 Visible After LoginVisible After LoginVisible After Login
Elongation at Break0.0 Visible After LoginVisible After LoginVisible After Login
Hardness, Shore A0.0 Visible After LoginVisible After LoginVisible After Login
Rebound Resilience0.0 Visible After LoginVisible After LoginVisible After Login
Tear Strength0.0 Visible After LoginVisible After LoginVisible After Login
Tensile Strength0.0 Visible After LoginVisible After LoginVisible After Login

Physical properties

PropertiesValue & unitTest conditionTest method
Density0.0 Visible After LoginVisible After LoginVisible After Login
Linear Mold Shrinkage0.0 Visible After LoginVisible After LoginVisible After Login

FE-251-U Processing Guidelines

Compression Molding Processing Guidelines

PropertiesValue & unitTest conditionTest method
Mold TemperatureVisible After LoginVisible After Login
Mold Time (10-25 mm thickness)Visible After LoginVisible After Login
Mold Time (25-50 mm thickness)Visible After LoginVisible After Login
Mold Time (5-10 mm thickness)Visible After LoginVisible After Login
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