Elastomeric Polyether Polysulfide Resin PER-50
Elastomeric Polyether Polysulfide Resin PER-50 is a primary form copolymer for flexible sealants in construction. It qualifies for HTS 3911.90.10.00 as an elastomeric polysulfide where the named units contribute ≥95% by weight per subheading note (a)(2). The polyether modification enhances flexibility without altering primary classification.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If predominant polyether block copolymer
Polyethers classified by predominant monomer in 3907, not polysulfides.
If for petroleum resin blends
If mixed with coumarone-indene making it non-elastomeric, shifts to 3911.10.
If latex emulsion form
Latex dispersions of synthetic rubber go to Chapter 40 subheadings.
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Import Tips & Compliance
• Provide FTIR or NMR analysis confirming ≥95% polysulfide/polyether comonomer content for subheading (a)(2)
• Label clearly as 'primary form' to prevent confusion with finished adhesives in 3506 or 3921
Related Products under HTS 3911.90.10.00
Mercaptan Polysulfide Elastomer Base M-100
Mercaptan Polysulfide Elastomer Base M-100 is a low-viscosity primary resin for two-part sealants. Classified in HTS 3911.90.10.00 for elastomeric polysulfides, with thiol groups enabling crosslinking. Primary form ensures it stays in heading 3911, not as finished rubber.
Low-Tg Elastomeric Polysulfone Pellets
Low-Tg Elastomeric Polysulfone Pellets offer glass transition below -40°C for cold-flexible applications. Under HTS 3911.90.10.00 as primary elastomeric polysulfones per Chapter notes. Pellet form confirms primary state.
Crosslinkable Polysulfide Elastomer Prepolymer
Crosslinkable Polysulfide Elastomer Prepolymer for potting compounds, elastomeric per 3911.90.10.00. Primary liquid form with pendant thiols.
UV-Resistant Elastomeric Polysulfide Resin
UV-Resistant Elastomeric Polysulfide Resin for outdoor sealants, classified 3911.90.10.00.
High-Sulfur Elastomeric Polysulfone Gum
High-Sulfur Elastomeric Polysulfone Gum base for specialty rubbers, HTS 3911.90.10.00.
Liquid Polysulfide Polymer LS-50
Liquid Polysulfide Polymer LS-50 is an elastomeric polysulfide prepolymer in primary form used as a base for sealants and adhesives. It falls under HTS 3911.90.10.00 as an elastomeric product specified in note 3 to Chapter 39, in primary forms (not mixed with other substances). Its high elasticity and sulfur linkages distinguish it from other polymers.