Preformed Calcium Silicate Exhaust Duct Insulation
Molded half-sections of calcium silicate for insulating hot gas exhaust ducts in petrochemical plants, leveraging high-temperature performance. These are heat-insulating articles of expanded mineral materials, classified under tariff item 6806.90.00.
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 half-sections are refractory ceramic articles
Refractory ceramic goods are classified in Chapter 69.
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
• Provide the CBSA with the chemical composition to show it is calcium silicate, not a ceramic material
• If the ducts are part of a larger system, consider whether the insulation is classified separately
• Verify if the product requires any special import permits for use in petrochemical facilities
Related Products under Tariff item 6806.90.00
Acoustical Mineral Wool Ceiling Panels
Rigid ceiling panels made from compressed rock wool, designed to absorb sound waves and reduce echo in offices and auditoriums. They qualify under tariff item 6806.90.00 as sound-absorbing articles of mineral wools, not elsewhere specified.
Basalt Fiber Rock Wool Roofing Board
Rigid roofing insulation boards made from melted basalt rock fibers, providing thermal and acoustic insulation for buildings. They are classified as articles of mineral wool under this tariff item, which covers heat-insulating, sound-insulating, or sound-absorbing mineral materials other than those of heading 68.11, 68.12, or Chapter 69.
Calcium Silicate Boiler Wall Insulation Blocks
Dense molded blocks of calcium silicate used to line high-pressure boiler walls, offering thermal stability and fire resistance. They are heat-insulating articles made from expanded mineral materials, falling under tariff item 6806.90.00 as 'Other'.
Calcium Silicate Kiln Insulation Segments
Curved molded segments of calcium silicate for lining rotary kilns, providing heat insulation and erosion resistance. These are specialized heat-insulating articles of expanded mineral materials, classified under tariff item 6806.90.00.
Calcium Silicate Turbine Housing Insulation
Custom-molded linings for steam turbine housings, made from calcium silicate for extreme heat and vibration resistance. These are heat-insulating articles of mineral materials, falling under tariff item 6806.90.00.
Clay Aggregate Acoustic Ceiling Baffles
Hanging acoustic baffles made from expanded clay aggregate, used in open ceiling designs in retail spaces to absorb sound. They are classified under tariff item 6806.90.00 as sound-absorbing articles of expanded clays.