Materials glossary / Frame material
TR90
On the label: TR90 · Frame material
What it is
A Swiss-developed thermoplastic nylon used for light, flexible, nearly unbreakable sport and kids' frames.
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
2 PubMed papers mention it with jewelry, allergy, eyewear or UV; the three most recent:
- Korean anti-inflammatory compound allergina enhances cardiac contractile function in isolated ventricular cardiomyocytes · Journal of alternative and complementary medicine (New York, N.Y.), 2004
- [Chronic lymphatic leukemia from B CD5+ cells: characteristics, clinical and laboratory features, and immunophenotyping] · Polski tygodnik lekarski (Warsaw, Poland : 1960), 1995
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.