Kieselguhr Insulating Brick from Germany
Insulating ceramic brick produced from kieselguhr (diatomite), offering excellent thermal resistance for boiler linings and high-heat applications. Classified under HTS 6901.00.00.00 due to its composition from siliceous fossil meals fired after shaping.
Duty Rate — Germany → United States
10%
Rate breakdown
9903.05.3910%Section 301 (forced labor) — European Union member state (col1 rate < 10 percent): MFN < 10% → total duty capped at 10%
Import Tips
• Include lab test results showing water absorption and silica content typical of diatomaceous earth
• Ensure marking indicates 'diatomite' or 'kieselguhr' composition for customs verification
• Avoid mixing with clay products in shipments to prevent average absorption calculations affecting classification