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
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If prepared as adhesive base with additives
Adhesive preparations of polymers fall under Chapter 35, shifting from primary forms.
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
• 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
Related Products under HTS 3910.00.00.00
Polydimethylsiloxane (PDMS) Fluid
Polydimethylsiloxane (PDMS) is a clear, viscous silicone polymer fluid used in lubricants, cosmetics, and as a release agent. It falls under HTS 3910.00.00.00 as a silicone in primary form, where the siloxane monomer units constitute 95% or more by weight of the polymer content per chapter notes.
Silicone Resin in Solid Form
Silicone resin is a heat-resistant, solid silicone polymer used in coatings and electrical insulators. Classified under HTS 3910.00.00.00 as silicones in primary forms, meeting the 95% siloxane monomer requirement per subheading notes.
Amino-Modified Silicone Fluid
Amino-modified silicone fluid enhances adhesion in textiles and hair care products. Falls under HTS 3910.00.00.00 as chemically modified silicones in primary form, compliant with Chapter 39 polymer classification rules.
Vinyl-Functional Silicone Polymer
Vinyl-terminated silicone polymers are crosslinking agents for RTV silicones. Classified in HTS 3910.00.00.00 as primary silicones where siloxane units exceed 95% by weight.
Phenyl-Modified Silicone Oil
Phenyl-modified silicone oil offers high thermal stability for transformer fluids. HTS 3910.00.00.00 applies as primary silicone per note (a)(3) for modified polymers.
Fluorosilicone Polymer Gum
Fluorosilicone gum stock is used in aerospace seals requiring fuel resistance. Primary form classification under HTS 3910.00.00.00 when fluoroalkyl siloxane monomers predominate.