Orthophthalic Polyester Resin


Product Documents

OPR™ - Technical Data Sheet Safety Data Sheet

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The  CTech-LLC® OPR™ is a low styrene emission unsaturated polyester resin based on orthophthalic acid. Excellent glass fiber wet out properties and easiness of application is characteristic for OPR™ orthophthalic polyester resin.

OPR™ resin is pre-accelerated unsaturated polyester resin with moderate gel time and very low peak exotherm..

Key Features

  • Thixotropic polyester resin
  • good mechanical properties
  • Excellent glass fiber wet out properties
  • Good corrosion resistance
  • Good physical strength properties


The OPR™ polyester resin is suitable for manufacturing numerous FRP products for the building and construction, transportation and marine markets.

Storage Conditions

To ensure maximum stability and maintain optimum properties, OPR™ orthophthalic polyester resin should be stored in closed containers, maintained below 20°C and away from heat sources and sunlight.

Shelf Life

Shelf life is 6 months when kept  unopened at recommended storage conditions.


CTech-LLC® warrants its products to be free from manufacturing defects. Buyer determines suitability of product for use and assumes all risks. Buyer’s sole remedy shall be limited to replacement of product. Any claim for breach of this warranty must be brought within one month of the date of purchase. CTech-LLC® shall not be liable for any consequential or special damages of any kind, resulting from any claim or breach of warranty, breach of contract, negligence or any legal theory. The Buyer, by accepting the products described herein, agrees to be responsible for thoroughly testing any application to determine its suitability before utilizing.