1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid CAS 90-20-0

Product name: 1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid
CAS：90-20-0
MF：C10H9NO7S2
MW：319.31
EINECS:201-975-7

Product Description

Product name: 1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid

CAS：90-20-0

MF：C10H9NO7S2

MW：319.31

EINECS:201-975-7

Use:

It is an important intermediate in the production of azo dyes

Specifications :

1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid Basic information
Product Name:	1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid
CAS:	90-20-0
MF:	C10H9NO7S2
MW:	319.31
EINECS:	201-975-7
Mol File:	90-20-0.mol
1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid Chemical Properties
Melting point	>300 °C(lit.)
density	1.6832 (rough estimate)
refractive index	1.7640 (estimate)
pka	-0.95±0.40(Predicted)
CAS DataBase Reference	90-20-0(CAS DataBase Reference)
EPA Substance Registry System	2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy- (90-20-0)

COA

Item	Specifications	Results
Appearance	A grayish to grayish brown powder	Conforms
Content(dry) %	≥85	85.28
Purity(HPLC) %	≥97	97.57
Chromotropic acid content %	≤1.00	0.44
Omega Acid %	≤0.5	0.07
T Acid %	≤0.30	0.3
Alkali insoluble substance %	≤0.2	0.08
Moisture %	≤5.00	4.56
Conclusion	Qualified

公司信息

Quality Assurance

Full-Process Quality Control: From incoming raw material inspection to in-process monitoring and final outgoing checks, every batch is inspected at each production stage against strict acceptance standards.
Third-Party Certified & Tested: Our quality management system is certified to ISO 9001, and products are regularly tested by accredited laboratories (e.g. SGS, TÜV). Test reports are available on request.
100% Batch Traceability: Each batch carries a unique lot number that links raw material records, production parameters, and test results, enabling complete traceability from factory to final delivery.
Pre-Shipment Inspection: Every order passes a final pre-shipment inspection, with inspection photos and reports shared before dispatch.

FAQ From Customers

Q1: What is the minimum order quantity?

A: There is no quantity limit for the first sample or trial order. Just tell us the actual quantity you need.
Q2: How can I confirm that the quality meets the requirements?

A: Provide your specifications, and our technical team will check them or customize them for you; we can provide TDS, MSDS, and COA, and accept third-party testing.
Q3: How do you ensure stable quality?

A: We manufacture under an ISO 9001 quality system, test every batch before release, and retain samples for 24 months for traceability.
Q4: Do you provide samples?

A: Yes — Free samples are available; freight is at buyer's expense for express delivery.