1937-37-7 Usage
Chemical Properties
black crystalline powder
Uses
Chlorozol Black E is a chitin-specific stain and used to detect fungal filaments. Dyes and metabolites, Environmental Testing.Environmental toxin on US EPA Toxic Release Inventory list (TRI) list.
Preparation
4-(4-Aminophenyl)benzenamine double nitriding, in acid conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?coupling, aniline diazo, in alkaline conditions and 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid?group of adjacent a coupling, product again with Benzene-1,3-diamine coupling.
General Description
Gray-black microcrystals or black powder.
Air & Water Reactions
Azo dyes can be explosive when suspended in air at specific concentrations. Slightly soluble in water.
Reactivity Profile
Direct Black 38 is an azo compound. Azo, diazo, azido compounds can detonate. This applies in particular to organic azides that have been sensitized by the addition of metal salts or strong acids. Toxic gases may form with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases form with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides. Incompatible with strong acids [NTP, 1992)].
Hazard
Confirmed carcinogen. Moderately toxic
by ingestion and inhalation. An eye irritant.
Health Hazard
ACUTE/CHRONIC HAZARDS: Direct Black 38 may be absorbed through the skin. When heated to decomposition it emits very toxic fumes of nitrogen oxides, disodium oxide and sulfur oxides.
Fire Hazard
Flash point data for Direct Black 38 are not available; however, Direct Black 38 is probably combustible.
Safety Profile
Confirmed carcinogen
with carcinogenic and tumorigenic data.
Moderately toxic by ingestion and
inhalation. An eye irritant. Mutation data
reported. When heated to decomposition it
emits very toxic fumes of NOx, Na2o, and
so2.
Properties and Applications
black. Palm black powder. Soluble in water for green light black, solubility 40 g/l (85 ℃), and adequate soluble in alcohol for green light blue-black, right amount soluble in soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid is a deep red in blue, diluted Purple dark reddish brown for to red light black precipitation; In nitric acid solution for yellow brown (not completely); In strong hydrochloric acid for dark red light black solution (don’t). The dye solution to join strong hydrochloric acid for Purple dark reddish brown, precipitation; Concentrated sodium hydroxide solution is generated gray light blue precipitaten. Cellulose fiber of dyeing, the dye absorption rate as well, in 80 ℃ temperature when the biggest affinity. Can discharge. Used for cotton, viscose, silk, polyamide fiber and its blending fabric, leather, wood, biological and plastic color, also used as the raw material of black ink.
Standard
Acid Resistance
Alkali Resistance
Light Fastness
Soaping
Water
Fading
Stain
Fading
Stain
ISO
3
3
3
2
2-3
AATCC
3
3
4-5
3
2
Standard
Acid Resistance
Fading
Stain
ISO
3
AATCC
3
Check Digit Verification of cas no
The CAS Registry Mumber 1937-37-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,9,3 and 7 respectively; the second part has 2 digits, 3 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1937-37:
(6*1)+(5*9)+(4*3)+(3*7)+(2*3)+(1*7)=97
97 % 10 = 7
So 1937-37-7 is a valid CAS Registry Number.