Industrial Grade Dimethyl Phosphite
Industrial dimethyl phosphite, typically 97-98% pure, is employed in manufacturing water treatment agents and as a reducing agent, classified in HTS 2920.21.00.00 as a pure phosphite ester. Its structure qualifies under chapter provisions for esters of inorganic nonmetal acids.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If hydrolyzed to phosphorous acid
Inorganic acids fall under Chapter 28, excluding organic esters per chapter notes.
If for retail-packaged finishing agents
Formulations for textile finishing shift to Chapter 38 as preparations.
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Import Tips & Compliance
• Label drums with UN 2845 hazmat markings; obtain end-user statements for chemical weapon convention compliance; test for stabilizer content to confirm single-compound status
Related Products under HTS 2920.21.00.00
Dimethyl Phosphite (DMP)
Dimethyl phosphite is a colorless liquid organophosphorus compound with the formula (CH3O)2P(O)H, classified under HTS 2920.21.00.00 as a phosphite ester of an inorganic acid of nonmetal (phosphorous acid). It serves as a key reagent in organic synthesis for producing phosphonate esters and flame retardants.
Distilled Dimethyl Phosphite 99%
High-purity distilled dimethyl phosphite (99% assay) is a phosphite ester used in pesticide intermediate production, falling under HTS 2920.21.00.00 due to its chemical definition as (CH3O)2P(O)H. It meets chapter note (a) for separate chemically defined organic compounds.
Dimethyl Phosphite with Stabilizer
Dimethyl phosphite stabilized with BHT for transport stability is a phosphite ester under HTS 2920.21.00.00, as chapter note (f) allows stabilizers necessary for preservation without changing classification. Used in herbicide synthesis.
Technical Dimethyl Phosphite for Flame Retardants
Technical grade dimethyl phosphite designed for flame retardant production is classified as a pure phosphite ester in HTS 2920.21.00.00 per chapter note (a). It reacts to form phosphorus-containing polymers.
High Assay Dimethyl Phosphite 99.5%
Ultra-high purity 99.5% dimethyl phosphite for pharmaceutical intermediates falls under HTS 2920.21.00.00 as a chemically defined phosphite ester. Its precision purity supports sensitive reactions.
Dimethyl Phosphite in Aqueous Solution 50%
50% dimethyl phosphite in water, prepared for safe transport, remains under HTS 2920.21.00.00 per chapter note (d) for products of note (a) dissolved in water. Used in corrosion inhibitors.