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Mercaptan Polysulfide Elastomer Base M-100 from Canada

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.

Duty Rate — Canada → United States

10%

Rate breakdown

9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada

Import Tips

Require supplier declaration of no fittings/attachments to maintain heading 3917 exclusion note applicability

Test for polymer purity; impurities >5% may reclassify per predominant monomer rule

Avoid bulk packaging confusion with retail sets that could invoke 3924 household exclusions