Polydimethylsiloxane (PDMS) Fluid
Polydimethylsiloxane (PDMS) fluid is a clear, viscous silicone polymer in liquid primary form, used in lubricants, cosmetics, and as a release agent. It falls under this tariff item as a silicone in primary forms, with the siloxane monomer units contributing 95% or more by weight of the polymer content.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the PDMS is in primary form (liquid) and not a finished article
• Declare the viscosity and siloxane content on the customs invoice to support classification
• Check if the product is subject to Canadian cosmetic regulations if used in personal care products
Related Products under Tariff item 3910.00.00
Amino-Modified Silicone Fluid
Amino-modified silicone fluid is a chemically modified silicone polymer in liquid form, used to enhance adhesion in textiles and hair care products. It falls under this tariff item as a silicone in primary forms, with the siloxane backbone predominating and the amino modification not altering its classification as a chemically modified polymer.
Fluorosilicone Polymer Gum
Fluorosilicone polymer gum is a silicone polymer in an uncured, gum-like primary form, used in aerospace seals for fuel resistance. It is classified here because the siloxane monomer units predominate and the fluoroalkyl side groups are appendages to the main polymer chain, making it a chemically modified silicone.
Hydroxy-Terminated Polydimethylsiloxane
Hydroxy-terminated polydimethylsiloxane is a reactive silicone fluid in primary form, used as a precursor in sealants and adhesives. It is classified under this tariff item as a silicone in primary forms, with the hydroxy termination being a chemical modification that does not change the predominant siloxane polymer classification.
Phenyl-Modified Silicone Oil
Phenyl-modified silicone oil is a silicone polymer in liquid primary form, offering high thermal stability for use in transformer fluids. It is classified here as a silicone in primary forms, where the phenyl groups are chemical modifications to the siloxane backbone, and the siloxane units predominate by weight.
Silicone Elastomer Base Uncured
Uncured silicone elastomer base is a silicone polymer in primary form, containing silica filler and peroxide catalyst for subsequent curing. It is classified here as a silicone in primary forms, provided the polymer content predominates and the fillers are subsidiary to the polymer's function.
Silicone Resin in Solid Form
Silicone resin in solid form is a heat-resistant silicone polymer used in coatings and electrical insulators. It is classified under this tariff item as a silicone in primary forms, meeting the 95% siloxane monomer requirement per the subheading notes, and is in a solid primary form such as lumps or powder.