Methyl Red

Melting point

179-182 °C (lit.)

Boiling point

412.44°C (rough estimate)

Density

0.839 g/mL at 25 °C

Bulk density

300-500kg/m3

Vapor density

9.3 (vs air)

Refractive index

1.5930 (estimate)

Fp

11 °C

storage temp.

Store at +5°C to +30°C.

Solubility

Ethanol: soluble1mg/mL

Form

Solid

Pka

4.95(at 25℃)

Colour Index

13020

Color

Reddish-violet

PH Range

4.4(red)-6.3(yellow)

Odor

Odorless

Water Solubility

Practically insoluble in water. Soluble in alcohol, acetic acidSoluble in ethanol. Insoluble in water.

λmax

410nm, 530nm, 427nm, 519nm

ε(extinction coefficient)

≥10000 at 282-288nm in methanol≥20000 at 509-519nm in methanol≥7000 at 329-335nm in methanol

Merck

14,6119

BRN

750102

Stability:

Stable. Incompatible with strong oxidizing agents.

Major Application

Waveguides, LED sensors, photoresists, liquid crystals, sol-gel matrix, optical sensors, paints, toys, detection of thiols, food freshness sensors, dental product, saliva sampling method, detecting lactic acid, carbohydrates

InChIKey

CEQFOVLGLXCDCX-MSUUIHNZSA-N

CAS DataBase Reference

493-52-7

NIST Chemistry Reference

Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-(493-52-7)

IARC

3 (Vol. 8, Sup 7) 1987

EPA Substance Registry System

Methyl red (493-52-7)