H-Acid Monosodium Salt (1-Amino-8-Hydroxy-4,6-NDS)
Known as H-Acid monosodium salt, this is 1-amino-8-hydroxy-4,6-naphthalenedisulfonic acid monosodium salt, a key dye coupler intermediate. It matches HTS 2922.21.2500 exactly as a named aminohydroxynaphthalenesulfonic acid salt with oxygen-function amino groups. Supplied as white to light brown powder for industrial synthesis.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for other amino-naphthol salts
If not exactly matching the named compound, it shifts to 'other' aminohydroxynaphthalenesulfonic acid salts in the same heading.
If supplied as technical grade mixture
Impure preparations or mixtures not meeting chemical purity notes fall to chemical preparations in Chapter 38.
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Import Tips & Compliance
• Use UN-approved chemical packaging for transport per safety notes (e); declare exact purity to prevent classification as impure mixture
• Common pitfall: confusing with disodium salt, which may fall under other subheadings
Related Products under HTS 2922.21.25.00
Monosodium 1-Amino-8-hydroxy-4,6-naphthalenedisulfonate
This is the monosodium salt of 1-amino-8-hydroxy-4,6-naphthalenedisulfonic acid, a chemically defined organic compound with amino and hydroxy oxygen functions on a naphthalene core, plus sulfonic acid groups forming the salt. It falls under HTS 2922.21.2500 as a specific aminohydroxynaphthalenesulfonic acid salt. Primarily used as an intermediate in dye synthesis.
CAS 117-94-2 1-Amino-8-Naphthol-4,6-Disulfonic Acid Monosodium Salt
CAS 117-94-2 identifies this pure monosodium salt of 1-amino-8-hydroxy-4,6-naphthalenedisulfonic acid, an oxygen-function amino-compound. Classified under HTS 2922.21.2500 due to its specific structure as an aminohydroxynaphthalenesulfonic acid salt. Used in manufacturing reactive dyes and pigments.
Technical Grade 1-Amino-8-Hydroxy-4,6-Naphthalenedisulfonic Acid Na Salt
Technical grade version of the monosodium salt, containing allowed stabilizers per chapter note (f), still classified as the pure compound under HTS 2922.21.2500. Features amino-hydroxy oxygen functions on naphthalene with disulfonic sodium salt. Used in bulk for azo dye manufacturing.
Dye Coupler H Salt Monosodium 1-Amino-8-OH-4,6-NDS
Industrial dye coupler known as H Salt, the monosodium salt of 1-amino-8-hydroxy-4,6-naphthalenedisulfonic acid. Precisely HTS 2922.21.2500 as a separate chemically defined oxygen-function amino-naphtholsulfonic salt. Essential for producing direct and reactive dyes in textile industry.