MR™ Series

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The MR™-Series is a line of materials optical applications with high refractive index, high Abbe number, low specific gravity and high impact resistance. The lens material is suitable for ophthalmic lenses and is known as the first thiourethane based high-index lens material. Offered in a variety of grades, MR™-Series yields safe, clear and lightweight lenses for spectacle lens wearer.

Due to its unique physical properties and characteristics, the eyeglass lens material can be used in a variety of premium lens applications such as:

  • Wide Colour Range Sunglasses
  • TRANSITIONS® Photochromic Lens System
  • Polarized Lens
  • Fashion forward, sophisticated eyeglass designs such as rimless or nylor frames

Comparison of physical properties of lenses made with MR™-Series to others

MR™-Series Characteristics

High Refractive Index for Thinner and Lighter Lenses

The optical lens material is suitable for use in the development of thin and light ophthalmic lenses. The MR™-Series offers 3 different refractive index products (R.I. 1.60, 1.67, 1.74). By using high refractive index material, it is possible to achieve thinner lenses with the same mechanical strength as thicker lenses would provide.

Superb Optical Quality for Wearer Comfort

With the high refractive index and high Abbe number of MR™-Series Monomers comparable optical performance to lenses produced from mineral glass can be achieved. In addition, glass mold-casted MR™-Series material shows minimal inner stress and the optical quality is superior to injection molded polycarbonate lens.

Mechanical Strength to Protect Wearers from Accidental Injury

MR™-Series' good mechanical strength and stress free properties make it suitable for unique lens designs such as "Rimless frame" or "High curve lens".

  • High impact and static load resistance promotes wearer eye safety
  • Good Tensile strength
  • Good processability for precisely designed Single Vision and Progressive lenses (Advantage of thiourethane materials).

Durability during Long Time Use under Severe Conditions

The optical material's durability and good weatherability ensures that the lens can withstand high usage with minimal de-colorization even after years of use. MR™-Series is compatible with a variety of coating materials such as Hard and AR-coatings (Antireflective Coatings). MR™-Series also has good colour tintability making it suitable for highly fashion sunglasses with special colour needs.


CR-39 is a trademark of PPG Industries, Inc. RAV7 is a trademark of ACOMON AG.
TRANSITIONS is a trademark of Transitions Optical, Inc.
All tests were conducted under specified test methods at Mitsui Chemicals, Inc. and are not guaranteed as specifications.