unsaturated polyester

polymer

Unsaturated polyester (UP) is a thermosetting polymer formed by cross-linking unsaturated polyester resin with a vinyl monomer, typically styrene, creating a rigid three-dimensional network. It is widely used in fiberglass-reinforced plastic (FRP) composites for automotive body panels, marine hulls, wind turbine blades, and chemical storage tanks, where engineers value its excellent corrosion resistance, low cost, and ease of manufacturing via hand lay-up or resin transfer molding. Compared to epoxy resins, unsaturated polyester offers faster cure times and lower material cost, making it the industry standard for large-scale composite structures that do not require the highest performance characteristics.

fiberglass reinforced compositesmarine/boat hullsautomotive body panelswind turbine bladeschemical storage tankspool construction

Compliance & Regulations

?UL 94?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

Property	Value	Unit	Conditions	Source
Glass Transition Temperature(Tg)	-77.79	°F	—

Verified Unverified Low confidence (<80%) Link to source

Regulatory Screening

Environmental

Safety & Biocompatibility

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.

unsaturated polyester

Thermal Properties

Regulatory Screening

Environmental

Safety & Biocompatibility