HS Code for CTMP pulp

Chemi-thermomechanical pulp (CTMP) is classified under HS code 4705.00. This code is designated for wood pulp obtained by a combination of mechanical and chemical pulping processes, often referred to as semi-chemical pulp. The classification process for wood pulp in Chapter 47 is primarily based on the method of production. CTMP is produced by a process where wood chips are first softened with chemicals (typically sodium sulfite) and heat (steam) before being processed in a mechanical refiner. This dual approach allows the pulp to maintain a high yield, similar to mechanical pulp, while gaining some of the strength and brightness characteristics associated with chemical pulp. Because the process involves both chemical and mechanical stages, it does not meet the criteria for purely mechanical pulp (4701) or purely chemical pulp (4703 or 4704). Therefore, it falls into the specific category of 4705.00. This is consistent with the Explanatory Notes to the Harmonized System, which clarify that pulps produced by such combined methods must be classified under this heading. The classification is essential for the paper industry as it distinguishes the pulp's physical properties and its suitability for various paper and board grades.

Products Included

• Bleached chemi-thermomechanical pulp
• Unbleached chemi-thermomechanical pulp
• Semi-chemical wood pulp
• Pulp produced by the neutral sulfite semi-chemical (NSSC) process
• Chemi-mechanical pulp (CMP)

Common Misclassification

CTMP is frequently misclassified under HS code 4701.00, which is reserved for purely mechanical wood pulp. While CTMP uses mechanical refining, the chemical pre-treatment excludes it from 4701.00. It is also sometimes confused with chemical wood pulp under HS code 4703.00 (soda or sulfate) or 4704.00 (sulfite). However, chemical pulps have the majority of their lignin removed, whereas CTMP retains most of the lignin. The distinction is based on the yield and the presence of chemical treatment during the refining process, making 4705.00 the only appropriate code for these hybrid pulps.

FAQ

What is the HS code for CTMP pulp?

The HS code for chemi-thermomechanical pulp (CTMP) is 4705.00, covering wood pulp obtained by a combination of mechanical and chemical processes.

How does CTMP differ from mechanical pulp in classification?

Mechanical pulp (4701.00) is produced solely by grinding, while CTMP (4705.00) involves a chemical pre-treatment step to soften the wood fibers before refining.