Liquid Polyisobutylene Napvis 10
Napvis 10 is a low-viscosity liquid polyisobutylene used in cable filling compounds and corrosion inhibitors, classified under tariff item 3902.20.00 as polyisobutylene in primary liquid form. The isobutylene monomer units predominate, meeting the classification criteria.
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:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the liquid is formulated as a prepared additive for lubricating oils.
Prepared additives for mineral oils are excluded from Chapter 39.
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 product is not mixed with fillers or other polymers that would change classification
• Provide viscosity and monomer composition data
• Verify the product is not a prepared additive for mineral oils, which would fall under Chapter 38
Related Products under Tariff item 3902.20.00
Butyl Rubber Vistanex L-100
Vistanex L-100 is a high molecular weight elastomeric polyisobutylene containing over 95% isobutylene monomer units, imported in primary pellet form. It falls under tariff item 3902.20.00 as polyisobutylene in primary forms, meeting the subheading note requirement of 95% or more monomer content.
Chewing Gum Base Polyisobutylene
Food-grade polyisobutylene specifically formulated for synthetic chewing gum base, with high monomer purity and classified under tariff item 3902.20.00 as polyisobutylene in primary forms. This elastomer provides the chewable texture required in gum.
Effage B100 Polyisobutylene
Effage B100 is a medium-high molecular weight polyisobutylene used for pharmaceutical sealants and transdermal patches, meeting monomer purity requirements. It is supplied as pharmaceutical-grade material in primary forms, qualifying under tariff item 3902.20.00.
Elastomeric Polyisobutylene Pellets for Tire Inner Liner
These elastomeric polyisobutylene pellets contain 97% isobutylene monomer content and are designed for compounding into tire inner liners. They are imported in primary pellet form and meet the 95% monomer threshold for classification under tariff item 3902.20.00.
Elastomeric Polyisobutylene Rubber
Elastomeric polyisobutylene rubber is a synthetic polymer where isobutylene monomer units constitute 95% or more by weight, imported in primary form. It is used in various applications requiring elasticity and gas impermeability, qualifying under tariff item 3902.20.00.
High Cis Elastomeric Polyisobutylene HMW
High molecular weight elastomeric polyisobutylene with high cis content and over 95% isobutylene by weight, imported as primary polymer. It is used in sealants, roofing membranes, and vibration dampers, and is classified under tariff item 3902.20.00.