Maleic Acid for Unsaturated Polyester Resins
High-reactivity maleic acid specifically produced for unsaturated polyester resin (UPR) manufacture, classified under HTS 2917.19.23.00. Optimized color (APHA <20) and acid number (390-410 mg KOH/g). Essential raw material for composites and gelcoats.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when used with phthalic anhydride in resin production
Phthalic derivatives in resin context may influence classification considerations.
If pre-reacted to polyester stage
Partially polymerized resins classify under Chapter 39 plastics.
If phthalic acid impurities exceeding specification
Contaminated maleic acid may fall under other acyclic acid provisions.
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Import Tips & Compliance
• Specify Gardner color scale and APHA color values in COA for resin manufacturers
• Use nitrogen-blanketed storage to prevent oxidation during transshipment
• Verify ortho-phthalic acid ratio compatibility for specific resin formulations
Related Products under HTS 2917.19.23.00
Maleic Acid (99% Purity, Industrial Grade)
Maleic acid is a dicarboxylic acid with the formula HO2CCH=CHCO2H, classified under HTS 2917.19.23.00 as an acyclic polycarboxylic acid. This high-purity industrial grade product is used in the production of unsaturated polyester resins, coatings, and agricultural chemicals. It meets Chapter 29 requirements for separate chemically defined organic compounds.
Maleic Acid Anhydride-Derived Maleic Acid
Maleic acid produced through hydrolysis of maleic anhydride, explicitly covered under HTS 2917.19.23.00 as 'maleic acid' regardless of production method. Used primarily in resin manufacturing and as a precursor for malic acid production. Qualifies as chemically defined acyclic polycarboxylic acid per Chapter 29 note (a).
Pharmaceutical Grade Maleic Acid USP
Ultra-pure maleic acid meeting United States Pharmacopeia (USP) standards for pharmaceutical applications, classified under HTS 2917.19.23.00. Used as counterion in drug salt formation and synthesis intermediate for APIs. Remains classified as the pure chemical compound despite high purity standards.
Maleic Acid Flakes (Technical Grade)
Technical grade maleic acid supplied in flake form for industrial applications, classified under HTS 2917.19.23.00. The physical form (flakes vs. powder) does not affect chemical classification as maleic acid. Primarily used in polyester resin production and water treatment formulations.
Stabilized Maleic Acid for Transport
Maleic acid with added polymerization inhibitor (hydroquinone 50-200 ppm) per Chapter 29 note (f) for safe transport, classified under HTS 2917.19.23.00. Stabilizer prevents exothermic polymerization during shipping. Used in unsaturated polyester resin manufacturing.
Food Contact Grade Maleic Acid
Maleic acid meeting FDA 21 CFR 175.300 specifications for food contact applications, classified under HTS 2917.19.23.00. Used in resin production for food packaging and as processing aid. Purity exceeds 99.5% with low heavy metals.