Marine-Grade Unsaturated Polyester Resin
Iso-polyester resin variant with enhanced water resistance for boat building and underwater composites. Falls under HTS 3907.91.5000 as other unsaturated polyester in primary form, classified by predominant comonomer weight under Chapter 39 notes. Ortho or iso-phthalic based formulations.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If polycarbonates instead of polyesters
Polycarbonates have distinct heading 3907.40, differentiated by polymer backbone structure.
If imported as monomeric precursors
Oxygen-function amino-compounds like isophthalic acid precursors classify under Chapter 29, pre-polymerization.
If pre-promoted with cobalt accelerators
Organic composite solvents with promoters exceed primary polymer purity, falling to 3814.
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Import Tips & Compliance
• Certify UV stabilizer content doesn't chemically modify beyond 'other' per note (a)(3); check for REACH compliance if EU origin; label drums with flash point for hazmat
Related Products under HTS 3907.91.50.00
Unsaturated Polyester Resin for Fiberglass
A liquid unsaturated polyester resin in primary form used as a base for composite materials in boat hulls and automotive parts. It falls under HTS 3907.91.5000 as an unsaturated polyester, not specifically named elsewhere, meeting the subheading note for polymers where the monomer units predominate by weight. Supplied in drums for industrial compounding with fiberglass reinforcement.
Gelcoat Unsaturated Polyester Resin
Thixotropic unsaturated polyester resin formulated as gelcoat for surface finishes on fiberglass reinforced plastics in marine and RV applications. Classified in HTS 3907.91.5000 as 'other' unsaturated polyester in primary liquid form, per polymer classification rules based on predominant monomer content. Used prior to curing with MEKP hardener.
Casting Unsaturated Polyester Resin
Low-viscosity unsaturated polyester resin designed for casting cultured marble countertops and decorative solid surfaces. It qualifies under HTS 3907.91.5000 as other unsaturated polyester in primary forms, with predominant monomer units per subheading note (a). Typically cured with fillers like ATH for opacity.
Clear Polyester Casting Resin
Crystal-clear unsaturated polyester resin for embedding objects in paperweights and art sculptures. Classified HTS 3907.91.5000 for other unsaturated polyesters in primary forms, adhering to monomer predominance rules. Low odor, styrene-monomer diluted.
Spray-Up Unsaturated Polyester Resin
Medium-reactivity unsaturated polyester resin optimized for spray-up fabrication of large FRP parts like tubs and pools. HTS 3907.91.5000 covers this as other unsaturated polyester, primary form per weight-based polymer notes. Compatible with continuous roving.
Iso-NPG Unsaturated Polyester Resin
Neopentyl glycol (NPG) modified isophthalic unsaturated polyester resin for corrosion-resistant panels and tanks. Under HTS 3907.91.5000 as other unsaturated polyester in primary forms, with NPG units predominant but not chemically modified per notes. High HDT properties.