Polysulfide Rubber—Morton Thiokol

ST polysulfide rubber is a millable gum elastomer prepared from bis (2-chloroethyl) formal and sodium polysulfide. Vulcanizates exhibit outstanding resistance to a broad spectrum of oils and solvents, to gas permeability, low temperature, ozone and weathering. Typical uses include gas meter diaphragms, rollers, printing blankets, o-rings, and many specialty molded items. 

All of the solvent immersion tests were run with the following recipe  

TABLE 2.4 POLYSULFIDE RUBBER-MORTON THIOKOL (continued) 

SOLVENT VOLUME INCREASE, % CONDITION SOLVENT VOLUME INCREASE, % CONDITION 

Ethylene dichloride 230 Very tender Dioctyl phthalate -2 OK 

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Morton Thiokol, Inc. markets a series of liquid polysulfides that can be oxidized to rubbers. These rubbers have excellent resistance to most solvents, good water and ozone resistance, very low specific permeability to many highly volatile solvents and gases, objectionable odor, poor physical properties, and a service temperature range of -55 to 150°C. 

Polysulfide Rubber, FA Polysulfide Rubber, TD FA/10-80/1M. Morton Thiokol Inc., Specialty Chemicals Division (Rohm Haas now own Morton Thiokol Inc. and Morton International). 

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