Trade names in elastomers — identifying Buna-S Buna-S rubber is widely used in tires and footwear. By which general polymer family name is Buna-S also known?

Introduction / Context:Commercial names and abbreviations often refer to the same polymer family. Buna-S is a historical trade term, while SBR is the standard materials designation. Knowing equivalences avoids confusion in specifications and purchasing.

Given Data / Assumptions:

• Buna-S = styrene-butadiene rubber.
• SBR is the accepted abbreviation in polymer engineering.

Concept / Approach:SBR is a random copolymer of styrene and butadiene. It is distinct from PTFE (Teflon) and polyacrylates. The question tests recognition of synonymous naming.

Step-by-Step Solution:Recall that “Buna” designations historically refer to butadiene-based rubbers.Map Buna-S → styrene-butadiene → SBR.Select SBR as the correct answer.

Verification / Alternative check:Standards (ASTM D2000 family) and materials catalogs list SBR as the generic for Buna-S.

Why Other Options Are Wrong:

• Teflon/PTFE: fluoropolymer, not an elastomer.
• Polyacrylates: different acrylic rubber class.

Common Pitfalls:

• Confusing historical trade names with modern abbreviations.

Final Answer:SBR