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Dye Intermediate

Product Name	Appearance	MP	Assay
H-ACID(DRY POWDER)	white powder		≥85%
H-ACID(DRY POWDER)	white paste		≥42%
3.3-DICHLOROBENZIDINE HYDROCHLORIDE	white crystal		≥72%
FAST SCARLET BASE G C.I.AZOIC DIAZO COMPONENT 12	light yellow powder	103 ^oC	≥88%
FAST SCARLET BASE b C.I.AZOIC DIAZO COMPONENT 5	orange yellow powder	137 ^oC	≥98%
FAST SCARLET BASE GL C.I.AZOIC DIAZO COMPONENT 8	orange red powder	113 ^oC	≥98.5%
FAST BORDEAUX GP BASE C.I.AZOIC DIAZO COMPONENT 1	orange red powder	120 ^oC	≥98%
1-AMINO 8-NAPHTHALl, 3,6-DISULPHONIC ACID

1-Amino 8-naphthal, 3,6-disulphonic Acid

Structural Formula:

Molecular Formula: C10H8O7NS2Na
Molecular Weight: 341.3

Physical and Chemical Properties:

(1)the solubility in water is 0.17% (20°C);
(2)the solubility in water is 2.40% (60C°C);
(3)insoluble in alcohol and aether;
(4)soluble in solutions of alkali, sodium carbonate and ammonia;
(5)the dilute solutiono f H-acid appears blue red fluorescence;
(6)H-acid can couple in both acid and alkali condition;
(7)a. the alkali solution of H-acid fast becomes dark in air; b. to produce yellow crystalline diazo compound when reacting with nitrous acid; c. diazo compounds are soluble in soda and alkali solution; d. appears light violet when dissolving in soda solution, appears dark green when dissolving in alkali solution.

Main Uses: used to produce all kinds of azo dyes, used to dye wools, textiles, papers and paper textiles; also used to synthesize pharmaceutical.