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1-Thioglycerol 98% (3-Mercapto-1,2-propanediol) – Asahi Chemical Co. Ltd.

Really? Is this a sulfur compound? Amazingly little odor

Compared with other mercaptans, it has extremely little odor.

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  • Mixes freely with water and alcohol

Every conceivable composition is at our disposal. It is easy to wash the equipment that is used.

  • Hypoallergenic and safe

LD50 (cat, intravenous): 0.22 g/kg
LD50 (mouse, intraperitoneal): 0.34 g/kg
LD50 (rabbit, intravenous): 0.25 g/kg
LD50 (rat, intraperitoneal): 0.39 g/kg

It is almost completely non-irritating and non-toxic at the concentrations normally used as pharmaceutical additives.

  • Excellent reducing ability and antioxidant performance

Not only can it be used as a stabilizer and antioxidant for antibiotics, but it can also be used permanent wave solutions because its excellent reducing ability causes it to cut the SS bonds in hair.
It also reduces metal oxides and is widely used as a metal rust preventive and rust remover.

  • Renders materials soluble that are generally insoluble in water (Fig. 1)

A water-soluble functional group can be created for water-insoluble compounds, via S (sulfur).
(Difficulties may be presented by certain substrates.)

  • Has antibacterial effects

It can also be used as an antibacterial preservative.

  • Has high chain transfer ability

It can be used as a polymerization regulator in the radical polymerization of water-soluble vinyl monomers.


1. General properties, etc.

AppearanceA viscous colorless to slightly yellowish hygroscopic liquid. It smells a bit sulfurous.
Chemical name3-Mercapto-1,2-propanediol
Other namesThioglycerin, monothioglycerol, α-monothioglycerol
Molecular weight108.16
CAS number96-27-5
CSCL number9-805
Boiling point248 ˚C
Specific gravity1.240 to 1.250 (25 ˚C)
Refractive index1.521~1.526 (25 ˚C)
pH3.5 to 7 (with 10% aqueous solution)
SolubilityMixes freely with water and various types of alcohol. Insoluble in BTXs.

2. Standard

PurityMore than 98% (as Iodometric titration)
OthersComplies with USP NF37 (Reference level)

3. Packaging

22 kg units20 L UN-Y PE cans
240 kg units200 L UN-Y chemical drums

4. Legal regulations, etc.

UN classificationUN2810, Class 6.1, Packing Group III
HS code2930.90.000
TSCAListed products
REACHNot registered by us
OthersListed on DSL, AICS, PICCS, NZIoC, and ASIA-PAC.

Contribute to society advancement by making better quality products with lower costs based on our higher technological value

Asahi Chemical Co., Ltd. has established a quality policy based on the continuous development of new technology, improved quality and reduced costs. This policy has served us well over the years as we have expanded in value and diversified our capabilities. Since we were established in 1932, we have commercialized one new product after another and succeeded in contributing to the world around us.

Products made by the technologies we have developed (in organic synthesis (thiochemistry), high-pressure gas reactions, coupling reactions (Ullmann reaction), and emulsification) are used widely in the fields of electronic and information-related materials, pharmaceuticals, cosmetics, textiles, and the environment.
In addition, by combining these core technologies, we are aggressively expanding into new fields where further growth is expected.

At the same time, we would like to contribute to human betterment by promoting CSR (corporate social responsibility) in such areas as compliance (legal compliance), protecting the environment, and safety measures.

We will continue to devote ourselves, day after day, to our aim of being a technology company that develops business with a global perspective.

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1-Thioglycerol, min 98% Catalog

Asahi Chemical Co., Ltd.

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