Vulcanized Fiber Electrical Insulation Sheets
Noncellular plates and sheets made from vulcanized fiber, a cellulose derivative processed with zinc chloride for high density and strength. These are used primarily for electrical insulation in motors and transformers due to their dielectric properties. Classified under HTS 3920.79.05.00 as non-reinforced sheets of vulcanized fiber.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when punched or cut to specific insulating shapes for electrical apparatus
Fabricated insulating fittings of vulcanized fiber for electrical machines fall under Chapter 85 as parts of apparatus.
If containing layers of metal foil backing
Laminated or supported with other materials like metal shifts classification to heading 3921 for combined plates/sheets.
If imported in rolls over 15 cm wide without plastic designation
Unmodified cellulose paper in web form may classify under paper headings if not chemically treated as vulcanized fiber.
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Import Tips & Compliance
• Verify material composition via lab testing to confirm vulcanized fiber content meets 95% polymer requirement per subheading notes
• Provide certificates of analysis documenting noncellular structure and absence of reinforcement or lamination
• Avoid misclassification as paper products; highlight chemical modification from cellulose to vulcanized fiber in documentation
Related Products under HTS 3920.79.05.00
Vulcanized Fiber Shim Stock Sheets
Thin precision sheets of noncellular vulcanized fiber used for shimming in machinery alignment. High tensile strength and machinability without lamination qualify it under this subheading. Specifically HTS 3920.79.05.00 for vulcanized fiber plates, sheets, film, foil, and strip.
Vulcanized Fiber Arc Chute Sheets
Non-reinforced sheets of vulcanized fiber cut for circuit breaker arc chutes to extinguish electrical arcs. The material's heat resistance and non-conductivity make it suitable without chemical modification beyond vulcanization. Classifies in HTS 3920.79.05.00 as vulcanized fiber plates/sheets.
Vulcanized Fiber Nameplate Blanks
Flat noncellular foil and strip of vulcanized fiber for engraving into machinery nameplates. Durable for outdoor exposure without reinforcement. HTS 3920.79.05.00 specifically for vulcanized fiber in these forms.
Vulcanized Fiber Transformer Pressboard
Dense noncellular plates of vulcanized fiber serving as pressboard in oil-immersed transformers. High compressive strength without lamination fits this cellulose derivative subheading. HTS 3920.79.05.00 applies to these unreinforced sheets.
Vulcanized Fiber Knife Handle Blanks
Noncellular sheets and blocks of vulcanized fiber rough-cut for custom knife handles. Moisture resistance and machinability without support classify it here. Under HTS 3920.79.05.00 as other vulcanized fiber plates/sheets.
Vulcanized Fiber Slot Liners
Thin strips and foil of noncellular vulcanized fiber for lining motor stator slots. Provides phase insulation without reinforcement. HTS 3920.79.05.00 for vulcanized fiber in strip/foil form.