Polytetrafluoroethylene (PTFE) is commercially known by which trade name?

Introduction / Context:
Common trade names for polymers are widely used in industry and exams. PTFE is a fluoropolymer valued for its exceptionally low friction coefficient, chemical inertness, and high continuous-use temperature, making it a staple in seals, gaskets, and non-stick coatings.

Given Data / Assumptions:

• PTFE = polytetrafluoroethylene.
• “Teflon” is the well-known trade name historically associated with PTFE products.
• Other names in options refer to different polymers.

Concept / Approach:
Mapping common names: Dacron = PET fibre; Bakelite = phenol–formaldehyde thermoset; Celluloid = cellulose nitrate/camphor; Lexan = polycarbonate. Therefore, PTFE corresponds to Teflon.

Step-by-Step Solution:
Identify polymer: PTFE.Recall trade name: Teflon.Select “Teflon.”

Verification / Alternative check:
Manufacturer literature and materials handbooks consistently associate PTFE with the Teflon brand.

Why Other Options Are Wrong:
Dacron: polyester fibre (PET).Bakelite: phenolic thermoset.Celluloid: cellulose nitrate plasticised with camphor.Lexan: polycarbonate.

Common Pitfalls:
Confusing PTFE with FEP or PFA (other fluoropolymers) that also have Teflon-branded variants; the core association remains PTFE.

Final Answer:
Teflon