Polymethyl methacrylate (PMMA), an acrylic resin widely used as a glass substitute, is commonly called what in trade names?

Introduction / Context:
Trade names often persist in engineering practice. Polymethyl methacrylate (PMMA) is a transparent thermoplastic known for its clarity and weather resistance and is frequently used as a lightweight alternative to glass.

Given Data / Assumptions:

• PMMA is marketed under several registered names.
• Engineers should recognise common synonyms to avoid procurement confusion.

Concept / Approach:
The best-known trade names for PMMA are “Plexiglass” and “Lucite.” These denote the same base material: polymethyl methacrylate. Other names in the options refer to different polymers: Thiokol is polysulfide rubber, Dacron is polyethylene terephthalate fibre, and Teflon is polytetrafluoroethylene (PTFE).

Step-by-Step Solution:
Identify PMMA’s commercial aliases.Eliminate unrelated polymers by trade name.Select “Plexiglass or Lucite.”

Verification / Alternative check:
Materials handbooks and vendor catalogs consistently equate PMMA with Plexiglass/Lucite.

Why Other Options Are Wrong:
Thiokol: polysulfide; Dacron: saturated polyester (PET); Teflon: PTFE — none is PMMA.

Common Pitfalls:
Confusing PMMA with polycarbonate (PC); PC is tougher and more impact resistant but has different chemical resistance and trade names (e.g., Lexan).

Final Answer:
Plexiglass or Lucite