The material selection platform
Plastics & Elastomers
The material selection platform
Plastics & Elastomers
by SpecialChem
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Technical Datasheet | Supplied by Sir Industriale
SIRESTER® IS 4245 by Sir Industriale is a thixotropic isophthalic unsaturated polyester resin (UPR). It is cured using 1.5% MEKP. Offers high mechanical properties. SIRESTER® IS 4245 is designed for hand lay-up and spray-up applications.
Product Type
UPR (Unsaturated Polyester Resin)
Product Status
Applications/ Recommended for
  • Conversion of composites & thermosets > Spray-up
  • Conversion of composites & thermosets > Hand lay-up

SIRESTER® IS 4245 Properties

Physical Properties

Value & Unit
Test Condition
Test Method
Monomer Content
45 %
( )
Gel time
17 min
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