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[PolySpec] A registered trademark for a series of polysulfide rubbers. Thiokol® rubbers were first made in the 1960s and were commonly used for o-rings, pipe linings, and building joints in the 1960s and 70s. The cured rubber, however, emitted sulfur containing fumes, especially in warm environments and the products were discontinued in the 1980s due to the popularity of urethane and silicones. The Thiokol® brand was revived in the 1990s by PolySpec for the production of polysulfide elastomeric sealants.


  • Emits sulfur containing fumes.
  • Early Thiokol products may contain PCBs.

Physical and Chemical Properties

  • Stable to organic solvents and dilute acids
  • Density = 1.6 g/ml

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