Introduction

D A S Acid
Also known as: DSD acid, 4,4-Diaminostilbene-2,2-Disulphonic Acid,  Di Amino Stilbene Acid

DAS acid is one of a number of Valetime “integrated” products – so termed as being produced in China from imported raw materials sourced from European producers supported by the Group.

Uses: Intermediate for dyes and etc.

CAS 81-11-8
Appearance : light yellow crystal powder

Specification

DSD Acid Specification sheet

Safety Information

No explosive, toxic, oxidising and radioactive hazards

DSD Acid MSDS

GENERAL

Synonyms: amsonic acid, flavonic acid, NCI-C60162, DASD, DAS, Tinopal BHS 2,2′-(1,2-ethylenediyl)bis(5-aminobenzenesulfonic acid)

Molecular formula: C14 H14 N2 O6 S2

CAS No: 81-11-8

PHYSICAL

Appearance: yellow crystals or powder

Melting point: > 325 C

STABILITY

Stable. Combustible. Incompatible with iron, strong oxidizing agents.

TOXICOLOGY

Believed to be toxic by ingestion (which suggests that the toxicity data given below are wrong – the figure of 47g/kg noted in the NTP chemical repository should perhaps be 47 mg/kg).

TOXICITY DATA

ORL-GPG LD50 47000 mg kg-1 (?)

PERSONAL PROTECTION

Treat as potentially toxic – use gloves, safety glasses and adequate ventilation.