| CAS
NO. |
502-02-3 (Base)
547-58-0
(Sodium) |
|
| EINECS
NO. |
208-925-3 |
| FORMULA |
(CH3)2NC6H4N=NC6H4SO3Na |
| MOL
WT. |
327.33 |
| H.S.
CODE |
|
| TOXICITY |
|
| SYNONYMS |
C.I. Acid Orange 52;
C.I. 13025; |
|
Sodium 4-(4-dimethylaminophenylazo)benzenesulphonate;
Tropaeolin D; p-((p-(Dimethylamino)phenyl)azo)benzenesulfonic acid
sodium salt; Sodium 4-(dimethylamino)azobenzene-4'-sulfonate; Sodium p-dimethylaminoazobenzenesulfonate;
Orange 3; Orange III; Methyl Orange B; 4-Dimethylaminoazobenzene-4'-sulphonic acid sodium salt;
Helianthin; Other CAS RN 1342-24-1; 66777-17-1; |
|
CLASSIFICATION
|
DYES
/ STAINS / DISINFECTANTS / INDICATORS /
|
|
PHYSICAL AND CHEMICAL PROPERTIES
|
| PHYSICAL
STATE |
orange fine crystalline powder |
| MELTING POINT |
300
C |
| BOILING
POINT |
|
| SPECIFIC GRAVITY |
|
| SOLUBILITY
IN WATER |
Soluble in hot water
(Insoluble in alcohol) |
| SOLUBILITY |
|
| AUTOIGNITION |
|
| pH |
|
| VAPOR DENSITY |
|
| NFPA RATINGS |
|
|
REFRACTIVE
INDEX
|
|
| FLASH
POINT |
|
| STABILITY |
Stable under ordinary conditions |
|
APPLICATIONS
|
|
Acid dyes are water-soluble dyes employed mostly in the form of sodium salts of
the sulfonic or carboxylic acids. They are anionic which attach strongly to
cationic groups in the fibre directly. They can be applicable to all kind of
natural fibres like wool, cotton and silk as well as to synthetics like
polyesters, acrylic and rayon. But they are not substantive to cellulosic
fibres. They are also used in paints, inks, plastics and leather. Orange acid
azo dyes produce an orange-pink color. They are used in coloring foods and drugs
and as intermediates for making photosensive dyes and drugs. They are used as
counter stains in histology and cytology and as components of Mallory's acid
fuchsin. Acid Fuchsin (acid magenta) is a various mixture of sulfonated fuchsins.
There are four of these compounds which have three sulfonic groups each. It is
used in Andrade's indicator and in various complex stains to demonstrate
collagen fibres red and in smooth muscle in contrast to
collagen. It is used as a pH indicator. The
pH range of Methyl Orange id form pH 3.0 pink-red to pH 4.4 yellow.
Methyl Orange
is used in oil field industry for alkalinity test of mud filtrate.
Examples of orange acid
dyes
- Ethyl orange Sodium salt (
CAS RN: 62758-12-7)
- Orange II
( CAS RN: 633-96-5)
- Orange
III (methyl orange, CAS RN: 547-58-0)
- Orange IV (CAS
RN: 554-73-4)
- Orange G
( CAS RN: 1936-15-8)
- Tropaeolin O
(CAS RN: 547-57-9)
- Victoria orange
- Acid Orange II
(Dibromofluorescein, 596-03-2)
|
| SALES
SPECIFICATION |
|
APPEARANCE
|
orange fine crystalline powder |
| DYE
CONTENT |
95.0%
min
|
|
LOSS
ON DRYING
|
5.0%
max
|
|
ABSORPTIVITY |
(pH 3.0)501-504nm: 1050
- 1150
(pH 4.4)467-471nm: 750 - 850 |
| TRANSPORTATION |
| PACKING |
|
| HAZARD CLASS |
6.1
(Packing Group: III) |
| UN
NO. |
3143 |
|
OTHER
INFORMATION
|
|
Hazard
Symbols: T, Risk Phrases: 25, Safety Phrases: 45 |
|
PRICE
INFORMATION
|
|
|
