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6903.90.00/Refractory Ceramic Furnace Muffle/Japan

Refractory Ceramic Furnace Muffle from Japan

High-alumina ceramic muffle protecting furnace heating elements from process atmosphere. Named example in HTS 6903.90.00 for refractory muffles used in industrial heat treatment. Fired ceramic construction per Chapter 69 standards.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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Import Tips

• Furnace OEM end-user letter prevents parts classification; verify no electrical function

• Common error: complete muffles with embedded heaters go to Chapter 85