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Hydroxy-Terminated Polydimethylsiloxane

Hydroxy-terminated PDMS is a reactive silicone fluid used in sealants and adhesives production. It qualifies under HTS 3910.00.00.00 as a primary form silicone per note (a)(3) for chemically modified polymers not more specifically covered.

Import Duty Rates by Country of Origin

Origin CountryMFN RateCh.99 SurchargesTotal Effective Rate
🇨🇳China3%+35.0%38%
🇲🇽Mexico3%+10.0%13%
🇨🇦Canada3%+10.0%13%
🇩🇪Germany3%+10.0%13%
🇯🇵Japan3%+10.0%13%

Alternative Classifications

This product could be classified differently depending on its characteristics or intended use.

3506.91Lower: 12.1% vs 38%

If prepared as adhesive base with additives

Adhesive preparations of polymers fall under Chapter 35, shifting from primary forms.

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Import Tips & Compliance

Document hydroxy modification as minor per Chapter 39 notes to stay in 3910; excessive modification risks 'Other' reclassification

Include viscosity and MW specs in import docs

Test for purity to avoid blending penalties