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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If vulcanized or chemically modified beyond primary form
Vulcanized synthetic rubbers fall under Chapter 40 as addition polymers, not primary form resins of 3911.
If primarily polyurethane-based elastomer
Polyurethanes are classified in 3909.30 regardless of elastomeric properties, based on predominant monomer units.
If non-elastomeric polysulfone or similar
Non-elastomeric versions of these polymers go to the residual 'Other' subheading within 3911.90.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify the polymer meets the elastomeric criteria per Chapter 39 Note 3 and provide monomer composition analysis showing predominant units
• Include Certificate of Analysis confirming primary form (not compounded or mixed) to avoid reclassification to 39.15
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.
Thiol-Terminated Polysulfide Prepolymer LP-3
Thiol-Terminated Polysulfide Prepolymer LP-3 is a viscous, elastomeric liquid used in aerospace sealants and coatings. Classified under HTS 3911.90.10.00 for elastomeric polysulfides in primary forms per subheading rules on polymer content. Its mercaptan-terminated structure provides elasticity for high-performance applications.