HS Code for Diethyl phosphite

Diethyl phosphite is classified under HS code 2920.22. This chemical is an ester of an inorganic acid of a non-metal. Chapter 29 of the Harmonized System covers organic chemicals, and heading 2920 is specifically for "Esters of other inorganic acids of non-metals (excluding esters of hydrogen halides) and their salts; their halogenated, sulphonated, nitrated or nitrosated derivatives." Within this heading, the 2920.2 series covers phosphite esters and their salts. Subheading 2920.22 is the specific international code for diethyl phosphite. This classification is based on the phosphorus-oxygen-carbon linkage characteristic of phosphite esters. Diethyl phosphite is a colorless liquid used primarily as a reagent in organic synthesis and as an intermediate for the production of various agricultural and industrial chemicals. The classification is determined by the fact that it is a phosphite ester (containing the P(OR)2(O)H or P(OR)3 structure) rather than a phosphate ester. The distinction between phosphites and phosphates is critical for correct HS classification. Under GRI 1, the specific name provided in the subheading 2920.22 takes precedence over more general categories. This compound is often used in the synthesis of flame retardants and as a catalyst in certain polymerization reactions. Because it is a clearly defined chemical compound, it must be classified in Chapter 29. If it were part of a formulated pesticide, it would move to heading 3808, but as a raw material or intermediate, 2920.22 is the correct designation.

Products Included

• Diethyl phosphite
• Diethyl hydrogen phosphite
• Salts of diethyl phosphite
• Technical grade diethyl phosphite

Common Misclassification

Diethyl phosphite is often confused with Dimethyl phosphite (HS code 2920.21) or other phosphite esters (HS code 2920.29). It is also frequently misclassified under HS code 2919.90, which covers phosphoric esters (phosphates). Phosphates have a different oxidation state for phosphorus compared to phosphites, and this chemical difference is reflected in the separate HS headings.

FAQ

What is the HS code for Diethyl phosphite?

The HS code for diethyl phosphite is 2920.22.

What are the primary industrial uses for diethyl phosphite?

It is primarily used as an intermediate in the synthesis of organophosphorus compounds, including flame retardants, pesticides, and lubricants.