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Methyl Red

  • Methyl Red
  • Methyl Red
  • Methyl Red
  • Methyl Red

Methyl Red

CAS No.: 493-52-7
Molecular Formula: C15H15N3O2
Molecular Weight: 269.3
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Product Description

Methyl Red is usually a lustrous purple crystal or reddish-brown powder. It is almost insoluble in water but soluble in ethanol, chloroform and acetic acid. It is mainly used in acid-base titration to indicate the pH value of the solution and determine the titration endpoint through color changes.


Chemical Properties
PropertyValue

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)


Safety Information

PropertyValue
Hazard symbolsXn, T, F, Xi, C, N
Hazard class codes10-20/21/22-68 /20/21/22-68-36/ 38-23/25-11-36/ 37/38-34-51/ 53-39/23/24/ 25-23/24/25
Safety descriptions36/ 37-24/ 25-22-45-33-24-16-7-36-26-36/ 37/ 39-61
UN dangerous goods numberUN 1170 3/PG 2
WGK Germany1
RTECS numberDG8960000
TSCATSCA listed
Hazard class3
Packing groupII
HS code29270000
Storage class11 - Combustible solids
Hazardous substances data493-52-7 (Hazardous Substances Data)


Product Usage

Methyl Red is a classic azo-type acid-base indicator extensively used in chemical analysis and laboratory testing. In acid-base titration, it provides a sensitive color transition between pH 4.4 (red) and pH 6.2 (yellow), making it a standard reagent for volumetric analysis. In the field of microbiology, it is the essential component of the Methyl Red (MR) test within the "IMViC" battery of tests, used to differentiate enteric bacteria based on their ability to produce stable acid end products from glucose fermentation. Additionally, it is widely applied in water quality testing and acidity monitoring for various industrial formulations.

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Shipping and Transportation

Delivery Time

Inventory 2-3 working days New manufacturing 7-10 working days

Mode of Transportation
1. By Air, fast but expensive.
2. By Sea, usual and economy.
3. By Train, suit for middle Asia countries.
4. By Express, suit for small package.
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FAQ

Q1: What international standards do your products and services comply with?

A1: Our products fully comply with international standards such as REACH, MSDS, and COA, and we strictly implement the ISO9001 quality management system. We can also provide third-party testing reports (SGS, BV, etc.) according to customer needs.


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A2: The delivery time depends on the transport mode and destination country. Generally, sea transport takes 15-30 days, air transport takes 3-7 days, and we will optimize the transport route to shorten the delivery time as much as possible.


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