METHYL RED INDICATOR
METHYL RED INDICATOR AR
C.I.No.13020
Short Name: METHYL RED INDICATOR
Synonym: 2-(N,N-Dimethyl-4-aminophenyl)azobenzenecarboxylic acid, C.I. Acid Red 2
Basic Details
Article No.
LG3108
Grade
AR
Purity
CAS No.
493-52-7
HS Code
2927.0090
Shelf Life
60 Months
Packings Avialable
Physical Properties
Physical state at 20 °C
Solid
Colour
Dark red powder
Odour
Odorless
Melting point/ Freezing point [°C]
179°C
Vapour density
9.3
Solubility in water [% weight]
Insoluble in water
Chemical Specifications
Appearance
Dark red to maroon to violet or purple powder or crystals
Identity
Passes test
pH transition range (4.4 - 6.2)
Pink Red – yellow orange
Insoluble matter in ethanol (1 g/L)
Passes test
Absorption maxima (buffer pH 4.5)
523 - 526 nm
Absorption maxima (buffer pH 6.2)
427 - 437 nm
Loss on drying (at 110°C)
Max 5.0%
Residue on ignition (as SO4)
Max 2.0%
Safety Information & Hazard Symbols
Safety Statement
22-24/25