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💾 Data Updated: Latest version • Last updated: December 09, 2025

9902.05.39 - Tetrakis(hydroxymethyl)phosphonium chloride (CAS No. 124-64-1) (provided for in subheading 2931.90.90)

Details

FieldValue
Unit of QuantityN/A
General Rate of Duty (Column 1 - General)Free
Special Rate of Duty (Column 1 - Special)No change
Column 2 Rate of DutyNo change
Quota QuantityN/A
Additional DutiesN/A
About Duty Rates: Rates are divided into Column 1 and Column 2. Column 1 is subdivided into General (normal trade relations rates for all countries not eligible for special programs) and Special (preferential rates for countries with free trade agreements or preference programs). Column 2 rates apply to products from Cuba, North Korea, Belarus, and Russia. When no special rate exists for a classification, General rates apply.

Overview

This HTS code, 9902.05.39, specifically covers Tetrakis(hydroxymethyl)phosphonium chloride (THPC), identified by its CAS number 124-64-1. This compound is a chemical substance primarily used as a biocide and flame retardant, often employed in industrial applications such as oilfield operations, textile treatment, and wood preservation. It is important to note that while this entry falls under Chapter 99, it is *provided for* in subheading 2931.90.90, indicating its underlying chemical classification.

As a leaf node within Chapter 99, this classification does not have further subcategories. Its purpose is to denote a specific temporary or special provision for THPC, distinct from the general chemical classifications that would apply outside of this special provision. The distinction from its "sibling" categories, which would represent other temporary legislation or trade agreement provisions within Chapter 99, lies in the precise identification and intended treatment of THPC under this particular code.

Frequently Asked Questions

›What is HTS code 9902.05.39?
HTS code 9902.05.39 covers Tetrakis(hydroxymethyl)phosphonium chloride (CAS No. 124-64-1) (provided for in subheading 2931.90.90) under the US Harmonized Tariff Schedule. It falls under Chapter 99: Temporary legislation; temporary modifications proclaimed pursuant to trade agreements legislation; additional import restrictions proclaimed pursuant to section 22 of the Agricultural Adjustment Act, as amended.
›What products are classified under 9902.05.39?
This classification covers Tetrakis(hydroxymethyl)phosphonium chloride (CAS No. 124-64-1) (provided for in subheading 2931.90.90). It falls under Chapter 99: Temporary legislation; temporary modifications proclaimed pursuant to trade agreements legislation; additional import restrictions proclaimed pursuant to section 22 of the Agricultural Adjustment Act, as amended.
›What is the import duty rate for 9902.05.39?
The general rate of duty for HTS 9902.05.39 is Free. Special preferential rates may apply: No change. The Column 2 rate is No change.
Go up to Chapter 99: Temporary legislation; temporary modifications proclaimed pursuant to trade agreements legislation; additional import restrictions proclaimed pursuant to section 22 of the Agricultural Adjustment Act, as amended

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