Polysulfide / Thiokol - Polysulfide Rubber

Typical Trade Names:

• FA Polysulfide Rubber - Thiokol Chemical Corp.
• ST Polysulfide Rubber - Thiokol Chemical Corp.

Polysulfide Rubber was one of the earliest commercial synthetic polymers and is prepared from dichlorides and sodium polysulfide. It has a remarkable combination of solvent resistance, low temperature flexibility, flex-crack resistance, and oxygen and ozone resistance. However, heat resistance, mechanical strength and compression set are not outstanding. Other seal compounds are more versatile from the performance standpoint, hence polysulfide rubber is recommended by Parker only for specific applications which cannot be satisfied by any other elastomer. Temperature range is -65 degrees to +225 degrees F (-54 degrees to +107 degrees C). Seals of polysulfide are recommended for service involving contact with solutions of petroleum solvents, ketones, and ethers.