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Mercaptoacetic acid

Mercaptoacetic acid
Mercaptoacetic acid structure
Chemical Name:
Mercaptoacetic acid
TGA;usafcb-35;MEQUINDOX;USAF cb-35;thioglycolic;thiovanicacid;Thioglycolate;Thiovanic acid;Thiovanie acid;mercaptoacetic
Molecular Formula:
Formula Weight:
MOL File:

Mercaptoacetic acid Properties

Melting point:
−16 °C(lit.)
Boiling point:
96 °C5 mm Hg(lit.)
1.326 g/mL at 20 °C(lit.)
vapor density 
3.2 (vs air)
vapor pressure 
0.4 mm Hg ( 25 °C)
refractive index 
n20/D 1.505(lit.)
Flash point:
126 °C
storage temp. 
3.68(at 25℃)
clear clear, colorless
1 (H2O, 20℃)
Water Solubility 
Air Sensitive
Exposure limits
TLV-TWA 1 ppm (~3.8 mg/m3) (ACGIH).
CAS DataBase Reference
68-11-1(CAS DataBase Reference)
NIST Chemistry Reference
Acetic acid, mercapto-(68-11-1)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  T,T+
Risk Statements  23/24/25-34-26-24/25
Safety Statements  25-27-28-45-36/37-28C-23
RIDADR  UN 1940 8/PG 2
WGK Germany  1
RTECS  AI5950000
Autoignition Temperature 662 °F
HazardClass  8
PackingGroup  II
HS Code  29309070
Hazardous Substances Data 68-11-1(Hazardous Substances Data)
Toxicity LD50 orally in rats: 0.15 ml/kg (Deichmann, Mergard)
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H290 May be corrosive to metals Corrosive to Metals Category 1 Warning P234, P390, P404
H301 Toxic if swalloed Acute toxicity,oral Category 3 Danger P264, P270, P301+P310, P321, P330,P405, P501
H311 Toxic in contact with skin Acute toxicity,dermal Category 3 Danger P280, P302+P352, P312, P322, P361,P363, P405, P501
H312 Harmful in contact with skin Acute toxicity,dermal Category 4 Warning P280,P302+P352, P312, P322, P363,P501
H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501
H330 Fatal if inhaled Acute toxicity,inhalation Category 1, 2 Danger P260, P271, P284, P304+P340, P310,P320, P403+P233, P405, P501
H331 Toxic if inhaled Acute toxicity,inhalation Category 3 Danger P261, P271, P304+P340, P311, P321,P403+P233, P405, P501
H370 Causes damage to organs Specific target organ toxicity, single exposure Category 1 Danger P260, P264, P270, P307+P311, P321,P405, P501
H402 Harmful to aquatic life Hazardous to the aquatic environment, acute hazard Category 3
Precautionary statements:
P234 Keep only in original container.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P271 Use only outdoors or in a well-ventilated area.
P272 Contaminated work clothing should not be allowed out of the workplace.
P273 Avoid release to the environment.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P284 Wear respiratory protection.
P390 Absorb spillage to prevent material damage.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P307+P311 IF exposed: call a POISON CENTER or doctor/physician.
P405 Store locked up.
P406 Store in corrosive resistant/… container with a resistant inner liner.
P403+P233 Store in a well-ventilated place. Keep container tightly closed.
P501 Dispose of contents/container to..…

Mercaptoacetic acid price More Price(15)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 528056 Thioglycolic acid ≥99% 68-11-1 100ml $18.7 2018-11-20 Buy
Sigma-Aldrich 88652 Thioglycolic acid solution ~80% in H 68-11-1 1l $103 2018-11-20 Buy
TCI Chemical M0052 Thioglycolic Acid >98.0%(T) 68-11-1 25g $14 2018-11-22 Buy
TCI Chemical M0052 Thioglycolic Acid >98.0%(T) 68-11-1 500g $38 2018-11-22 Buy
Alfa Aesar B20391 Mercaptoacetic acid, 97+% 68-11-1 100g $23.3 2018-11-13 Buy

Mercaptoacetic acid Chemical Properties,Uses,Production


Thio glycolic acid (TGA) is the organic compound HSCH2CO2H . It contains both a thiol (mercaptan) and a carboxylic acid. It is a clear liquid with a strong unpleasant odor. It is readily oxidized by air to the corresponding disulfide [SCH2CO2H]2.
TGA was developed in the 1940s for use as a chemical depilatory and is still used as such, especially in salt forms, including calcium thioglycolate and sodium thioglycolate. TGA is the precursor to ammonium thioglycolate that is used for permanents. TGA and its derivatives break the disulfide bonds in the cortex of hair. One reforms these broken bonds in giving hair a "perm." Alternatively and more commonly, the process leads to depilation as is done commonly in leather processing. It is also used as an acidity indicator, manufacturing of thioglycolates, and in bacteriology for preparation of thioglycolate media.
TGA is also used in the making of tin stabilizers often used in certain polyvinyl chloride products (such as vinyl siding).
TGA, usually as its dianion, forms complexes with metal ions. Such complexes have been used for the detection of iron, molybdenum, silver, and tin.
Thioglycolic acid is used as nucleophile in thioglycolysis reactions used on condensed tannins to study their structure.

Chemical Properties

Thioglycolic acid is a colorless liquid with a strong unpleasant odor like rotten eggs.

Chemical Properties

Also known as mercaptoacetic acid, HSCH2COOH is a colorless liquid with a strong unpleasant odor. Used as a reagent for metals such as iron, molybdenum, silver, and tin,and in bacteriology.


Thioglycolic Acid is an organic compound containing both a thiol and a carboxylic acid. Thioglycolic Acid is a precursor to ammonium thioglycolate, a chemical used for permanents. Thioglycolic Acid is used in organic synthesis as a nucleophile in thioglycolysis reactions and is used as a S transfer agent for sulfonyl chloride synthesis.


Sensitive reagent for iron, molybdenum, silver, tin. With ferric iron a blue color appears, and when an alkali hydroxide is added to a solution contg ferrous salts and thioglycolic acid, a yellow precipitate forms. Used in the manufacture of thioglycolates. The ammonium and sodium salts are commonly used for cold waving and the calcium salt is a depilatory. The sodium salt also is used in bacteriology in the preparation of thioglycolate media.


Mercaptoacetic acid is used as a reagent formetals analysis; in the manufacture of thioglycolates, pharmaceuticals, and permanentwave solutions; and as a vinyl stabilizer.

General Description

A colorless liquid with an unpleasant odor. Density 1.325 g / cm3. Used to make permanent wave solutions and depilatories. Corrosive to metals and tissue.

Air & Water Reactions

Readily oxidized by air. Water soluble.

Reactivity Profile

Mercaptoacetic acid is readily oxidized by air . Reacts readily with other oxidizing agents as well in reactions that may generate toxic gases. Incompatible with diazo and azo compounds, halocarbons, isocyanates, aldehydes, alkali metals, nitrides, hydrides, and other strong reducing agents. Reactions with these materials may generate heat and toxic and flammable gases. May react with acids to liberate hydrogen sulfide. Neutralizes bases in exothermic reactions. Reacts with cyanides, sulfites, nitrites, thiosulfates to generate flammable and toxic gases and heat. Reacts with carbonates and bicarbonates.


Toxic by ingestion and inhalation, strong irritant to tissue, eyes, and skin.

Health Hazard

TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Health Hazard

Mercaptoacetic acid is a highly toxic and ablistering compound. Even a 10% solutionwas lethal to most experimental animals by dermal absorption. The oral LD50 value ofundiluted acid is less than 50 mg/kg (Patty1963). The lethal dose in rabbits by skinabsorption is 300 mg/kg. The acute toxicsymptoms in test animals include weakness,respiratory distress, convulsions, irritation ofthe gastrointestinal tract, and liver damage.
Mercaptoacetic acid is a severe irritant.Contact with eyes can cause conjunctivalinflammation and corneal opacity. Skin contact can result in burns and necrosis.

Fire Hazard

Combustible material: may burn but does not ignite readily. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.

Safety Profile

Poison by ingestion, skin contact, intraperitoneal, and intravenous routes. Moderately toxic by subcutaneous route. A corrosive irritant to skin, eyes, and mucous membranes. When heated to decomposition it emits toxic fumes of SOx. See also MERCAPTANS and HYDROGEN SULFIDE.

Potential Exposure

Thioglycolic acid is used to make thioglycolates; in sensitivity tests for iron; in formulations of permanent wave solutions and depilatories; in pharmaceutical manufacture; as a stabilizer in vinyl plastics.

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 20 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, contact a physician, hospital or poison center at once. If the victim is unconscious or convulsing, do not induce vomiting or give anything by mouth. If conscious, do not induce vomiting. For dilute acid; ive water, milk, milk of magnesia; A(OH)3, or Ca(OH) 2. Avoid carbonates or bicarbonates. For concentrated acid, it may be dangerous to administer water or antacids. Some authorities suggest ice water or a snow slurry. Medical observation is recommended for 24-48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema or pneumonitis, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy.


UN1940 Thyoglycolic acid, Hazard class: 8; Labels: 8-Corrosive material.

Purification Methods

Mix the acid with an equal volume of *benzene; the *benzene is then distilled off to dehydrate the acid. After heating to 100o to remove most of the *benzene, the residue is distilled under vacuum and stored in sealed ampoules at 3o. [Eshelman et al. Anal Chem 22 844 1960, Beilstein 3 IV 1130.]


Compounds of the carboxyl group react with all bases, both inorganic and organic (i.e., amines) releasing substantial heat, water and a salt that may be harmful. Incompatible with arsenic compounds (releases hydrogen cyanide gas), diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides (releasing heat, toxic and possibly flammable gases), thiosulfates and dithionites (releasing hydrogen sulfate and oxides of sulfur). Air, strong oxidizers; bases, active metals, for example, sodium potassium, magnesium, and calcium. Readily oxidized by air. Thermal decomposition causes release of hydrogen sulfide. May attack various metals.

Waste Disposal

Dissolve in flammable solvent and burn in furnace equipped with afterburner and alkaline scrubber.

Mercaptoacetic acid Preparation Products And Raw materials

Raw materials

Preparation Products

Mercaptoacetic acid Suppliers

Global( 228)Suppliers
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Mercaptoacetic acid Spectrum

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