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The following are some commonly used safety materials used for prescription lenses:

Trivex: (Also known as Trilogy, Phoenix):

Trivex lenses are new to the Australian prescription safety eyewear market. Not only have they just been added to the newly proposed ASNZs 1337.6 standard for MEDIUM impact resistance but they have a few added benefits over the traditional polycarbonate safety material. These include:
  • More chemical resistance than polycarbonate
  • Lower specific gravity (lighter) than polycarbonate
  • Higher Abbe Number (better optical quality) than polycarbonate
  • 100% UV protection (same as polycarbonate)
  • Scratch resistant (same as polycarbonate)
The above qualities of Trivex, will be an exciting era for the safety eyewear industry.

CR39:

This hard resin monomer used for many current standard optical prescriptions is not recommended for prescription safety glasses. CR39 can be specifically ground to meet low impact standards but not medium impact. CR39 is good for chemical resistance but is thicker and heavier than other prescription safety materials.

Polycarbonate Lenses:

Polycarbonate lenses have long been regarded as the lens material of choice for prescription safety eyewear.

Advantages of Polycarbonate lenses:
  • Approved for medium impact protection
  • 100% UV protection
  • Scratch resistance
  • Thinner and lighter than CR39
Disadvantages of Polycarbonate Lenses:
  • Lower chemical resistance compared to CR39 and trivex
  • Non-tintable
  • The table below summarizes general properties of the three materials:

      CR39 TRIVEX POLYCARBONATE
    Abbe No: 58 43-46 29
    Approved Impact Resistance: LOW MEDIUM MEDIUM
    Refractive Index: 1.49 1.53 1.59
    Specific Gravity: 1.32 1.11 1.22

    Chemical Resistance:

    Acetone
    Perfumes
    Hairspray
    Household Cleaners
    Solvents
    Windex/Ammonia

    GOOD

    GOOD
    GOOD
    GOOD
    GOOD
    GOOD
    GOOD

    GOOD

    GOOD
    GOOD
    GOOD
    GOOD
    GOOD
    GOOD

    POOR

    POOR
    POOR
    POOR
    POOR
    POOR
    POOR

    Scratch Resistance: YES YES YES
    100% UV Protection NO NO NO

      
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