Direct Black 32
Synonyms
C.I. 35440;
C.I. Direct Black 32;
2-Naphthalenesulfonic acid, 6-((2-amino-4-((2-hydroxyethyl)amino)phenyl)azo)-3-((4-((4-((7-((2-amino-4-((2-hydroxyethyl)amino)phenyl)azo)-1-hydroxy-3-sulfo-2-naphthalenyl)azo)phenyl)amino)-3-sulfophenyl)azo)-4-hydroxy-, trisodium salt;
Category
Zwitterionic Surfactant
> Sulfonate Type
>> Azo Dye
Chemical Numbering System
CAS: 6428-38-2
EINECS: 229-209-7
Molecular Formula & Molecular Weight
Molecular Formula: C48H40N13Na3O13S3; C48H43N13O13S3.3Na
Molecular Weight: 1172.07
Structure
Properties
Appearance (1), solid.
Solubility soluble in water.
Stability stable.
Risk Solid form: flammable material; irritation, irritation to skin, eye, respiratory system. Harmful products of combustion are CO, CO2, nitrogen oxides and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
mouse intraperitoneal LD50 |
1060mg/kg[1] |
|
mouse oral LD50 |
> 5000mg/kg[1] |
|
rat intraperitoneal LD50 |
1000mg/kg[1] |
|
rat oral LD50 |
> 10000mg/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent masking, dyeing, antistatic abilities.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
95.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
Major Uses
1, Typical applications
Use as dye.
Manufacturers
References
[1]: ChemIDplus. 6428-38-2, C.I. 35440
Update: 20190714(1);