Materials glossary / Frame material
Injection-molded plastic (TR90, nylon, polycarbonate)
On the label: Injection-molded plastic · Frame material
What it is
Frames molded in one shot, light and flexible, cheaper than acetate, in flat colors; TR90 is a nylon that bends without breaking.
Frame materials: Frame materials: acetate, injection-molded plastics, metals and the memory alloys; weight, flex, allergy and repairability follow from the material.
In the research
8 PubMed papers mention it with jewelry, allergy, eyewear or UV; the three most recent:
- Deformation analysis method for precision injection molding of optical plastic lenses with a multi section approach based on warpage and shrinkage behavior · Optics express, 2025
- Variotherm assisted precision injection molding of plastic optical lenses based on improved cooling stage control model · Scientific reports, 2025
- Ultra-small four-emission-point spectral-detection system using seven-dichroic-mirror array · Talanta, 2021
A paper is a paper, not a verdict: titles are listed so you can read them, and a study on one fabric or one filter says little about the piece in your hand.
Other frame materials
Clasp & Lens describes materials from the public record and does not appraise, grade or test pieces; what a listing states is the supplier's statement. If a piece causes a rash, take it off; a reaction that spreads or blisters is a doctor's question, and sunglasses are no substitute for impact-rated eye protection where that is required.