Kraft Pulping Digester
A kraft pulping digester is a large pressure vessel used in the kraft process to cook wood chips with chemicals to separate lignin and produce pulp from fibrous cellulosic material, operating under high temperature and pressure. This machinery is essential for making pulp of fibrous cellulosic material, fitting tariff item 8439.10.00.
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 imported as a part of a pulp-making system
Parts of pulp-making machinery are classified under this item.
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
• Ensure the digester is classified as machinery for making pulp of fibrous cellulosic material
• Verify it is not a pressure vessel of Chapter 73, which would be excluded by Section Note 1
• Have technical documentation showing its use in the kraft pulping process
Related Products under Tariff item 8439.10.00
Atmospheric Diffuser Washer
An atmospheric diffuser washer is a key component in the pulp production process, operating at atmospheric pressure to displace black liquor from brownstock pulp using countercurrent washing. This machinery improves pulp cleanliness and is integral to processing fibrous cellulosic material, falling directly under tariff item 8439.10.00 for machinery for making pulp.
Batch Pulp Digester
A batch pulp digester is a cylindrical vessel loaded in batches with wood chips and cooking liquor to produce chemical pulp through intermittent cycles, commonly used in smaller mills for flexible production. This machinery is essential for making pulp of fibrous cellulosic material, fitting the scope of tariff item 8439.10.00.
Brown Stock Pump for Pulp Lines
A brown stock pump for pulp lines is a heavy-duty centrifugal pump designed for transferring brownstock pulp slurry at 10-15% consistency post-digestion, with an open impeller to prevent fiber clogging. This pump is used in cellulosic pulp processes and is classified under tariff item 8439.10.00 as machinery for making pulp of fibrous cellulosic material.
Chip Metering Feeder
A chip metering feeder is a precision screw feeder that accurately meters wood chip flow into digesters, controlling inventory and digester filling for consistent pulp production from cellulosic material. This machinery is essential for the pulping process and falls under tariff item 8439.10.00 for machinery for making pulp of fibrous cellulosic material.
Chip Presteaming Bin
A chip presteaming bin is a vessel that heats wood chips with low-pressure steam to soften fibers and remove air before pulping, enhancing impregnation efficiency. This equipment is an essential first step in chemical pulp production from cellulosic material, fitting tariff item 8439.10.00 for machinery for making pulp.
Continuous Wood Chip Digester
A continuous wood chip digester is an automated digester that continuously feeds wood chips through cooking zones for efficient pulp production from cellulosic fibers, featuring stratified impregnation and cooking stages for optimal lignin removal. This machinery is central to making pulp of fibrous cellulosic material, falling under tariff item 8439.10.00.