Insulating Clay Refractory Blocks from Japan
Lightweight clay refractory blocks with insulating properties for boiler and incinerator construction, fired from shaped clay mixtures. HTS 6902.90.50.10 covers these as clay-based refractory blocks other than siliceous types. They minimize heat loss in high-temperature applications.
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%
Import Tips
• Include thermal conductivity test results (<0.5 W/mK typical) to substantiate refractory insulation claims
• Ensure packing lists specify 'fired clay refractory' to avoid scrutiny as unfinished goods
• Check for chrome content; if >10%, may require additional hazardous material declarations