Thiokol — In rubber and polymer technology, “Thiokol” refers to which material class?

Introduction / Context:
Thiokol is a historical trade name for polysulfide rubbers. These elastomers are known for exceptional fuel and solvent resistance and good gas impermeability, making them valuable in sealants, fuel tank sealants, and chemical-resistant applications.

Given Data / Assumptions:

• We must identify the correct class of material for “Thiokol.”
• Options include elastomers and unrelated polymer classes.

Concept / Approach:
Polysulfide rubbers are produced by condensation polymerization involving dihalides and sodium polysulfide, yielding –S–S– linkages in the backbone. These confer chemical resistance but also characteristic odor and specific mechanical behavior. They are often supplied as liquid polymers cured to elastomeric networks.

Step-by-Step Solution:
Recall: Thiokol is synonymous with polysulfide rubber.Properties align with sealant and solvent-resistant applications.Therefore, select polysulfide rubber.

Verification / Alternative check:
Industry datasheets and historical literature consistently identify Thiokol as polysulfide elastomer.

Why Other Options Are Wrong:

• Polyamide fiber: nylon family; unrelated.
• Engineering thermoplastics: different category (e.g., PC, POM).
• EPS foam: foamed polystyrene, not an elastomer.
• Silicone elastomer: different chemistry (siloxane backbone), not Thiokol.

Common Pitfalls:
Assuming all elastomers with chemical resistance are silicones; conflating trade names.

Final Answer:
Polysulfide rubber (liquid polysulfide elastomer)