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Propylene Glycol Manufacturer/High quality/Best price/In stock
Cas No: 57-55-6
USD $ 3.0-3.0 / Kilogram 1 Kilogram 1-100 Metric Ton/Month Hangzhou Dayangchem Co., Ltd. Contact Supplier
High Purity Propylene glycol (PG)
Cas No: 57-55-6
No Data 200 Kilogram 1000 Kilogram/Day Shandong Chi Run Chemical Trading Co., Ltd. Contact Supplier
Propylene Glycol
Cas No: 57-55-6
USD $ 1.0-1.0 / Metric Ton 1 Metric Ton 3000 Metric Ton/Year Hefei TNJ chemical industry co.,ltd Contact Supplier
Competitive price Propylene Glycol
Cas No: 57-55-6
No Data 1 Metric Ton 100 Metric Ton/Day EAST CHEMSOURCES LIMITED Contact Supplier
1,2-Propanediol CAS NO.57-55-6
Cas No: 57-55-6
USD $ 1.0-1.1 / Gram 500 Gram 500 Kilogram/Week Hebei Ruishun Trade Co.,Ltd Contact Supplier
Propylene glycol
Cas No: 57-55-6
USD $ 1600.0-1800.0 / Metric Ton 1 Metric Ton 100 Metric Ton/Day DB BIOTECH CO., LTD Contact Supplier
Propylene Glycol Solvent raw materials
Cas No: 57-55-6
No Data 1 Kilogram 100 Metric Ton/Month Hangzhou Yierdechem Co. Ltd Contact Supplier
Propylene Glycol
Cas No: 57-55-6
USD $ 900.0-950.0 / Metric Ton 20 Metric Ton 3000 Metric Ton/Month Selena Zhou Contact Supplier
Propylene glycol (PG) price food grade CAS No 57-55-6
Cas No: 57-55-6
USD $ 51.0-55.0 / Gram 10 Gram 200 Metric Ton/Month Hebei Huanhao Biotechnology Co.,Ltd Contact Supplier
Propylene glycol
Cas No: 57-55-6
No Data 1 Metric Ton 1-10 Metric Ton/Day ENAO Chemical Co, Limited Contact Supplier

57-55-6 Usage

Chemical property

It is a colorless, stable and viscous hydroscopic liquid, and is almost odorless and tasteless. It is miscible with water, ethanol and various organic solvents.

Physical and Chemical Properties

Propylene glycol is scientifically named as “1,2-propanediol”, and has a chemical formula of CH3CHOHCH2OH and a molecular weight of 76.10. There is a chiral carbon atom in the molecule. Its racemate is a hygroscopic viscous liquid and is slightly spicy. It has a specific gravity of 1.036 (25/4 °C), a freezing point of-59 °C, and a boiling point of 188.2 °C, respectively 83.2 °C (1,333 Pa). It is miscible with water, acetone, ethyl acetate and chloroform, and is soluble in ether. It is soluble in many essential oils, but is not miscible with petroleum ether and paraffin oil. It is relatively stable to heat and light, and is more stable at low temperatures. Its L-isomer has a boiling point of 187 to 189 °C and a specific optical rotation [α] of D20-15.0°. It can be oxidized at high temperatures to propionaldehyde, lactic acid, pyruvic acid and acetic acid.
 the molecular structure of propylene glycol
Figure 1 the molecular structure of propylene glycol.
Propylene glycol is a diol having the general nature of the alcohol. It can react with inorganic and organic acids to generate mono-or di-esters. It reacts with propylene oxide to generate ether, with hydrogen halide to generate halohydrin, and with acetaldehyde to generate methyl dioxolane.

Irritation data

Eyes-rabbit 100 mg mild

Extinguishing agent

Dry powder, foam, sand, water.

Flammability hazard characteristics

Flammable; generate irritating smoke upon combustion


1. It is used as a resin, a plasticizer, a surfactant, and materials for emulsifier and demulsifier. It is also used as antifreeze and heat carrier.
2. It is used as gas chromatography stationary phase, solvents, antifreeze, a plasticizer and a dehydrating agent.
3. A carrier solvent; wetting agents; moisturizing agents; anti-caking agents; antioxidants; texturizing agents; surfactant; stabilizer; a thickener; dough modifiers; emulsifiers; flavoring agents; excipient; processing aids.GB2760-96 lists it as food processing aids.
It is mainly used as solvents for a variety of flavors, colors and preservatives, and as extraction solvents for vanilla beans, roasted coffee grains and natural spices. It is used as moisturizing agents and softeners for candy, bread, packaged meats and cheese. It is also used as mildew agents for noodles and sandwiches class. Addition of 0.006% in soymilk enables the flavor not to change upon heating and produces white glossy packaging tofu, which undergoes volume expansion when fried.
4. Propylene glycol is an intermediate for fungicide difenoconazole.
5. It is used a solvent. Preservatives, colorings, antioxidants and other poorly water-soluble food additives can be dissolved therein, which is then added into food; it is strongly hygroscopic and has food moisturizing and anti-freeze effect. China stipulates its use for pastry, and the maximum usage is 3.0g/kg.
6. Propylene glycol is an important raw material for unsaturated polyester, epoxy resin, and polyurethane resin. The use amount in this area accounts for about 45% of the total consumption of propylene glycol. Such unsaturated polyester is used extensively for reinforced plastics and surface coatings. Propylene glycol is excellent in viscosity and hygroscopicity and is non-toxic, and thus is widely used as hygroscopic agent, antifreeze, lubricants and solvents in the food, pharmaceutical and cosmetic industry. In the food industry, propylene glycol reacts with fatty acid to give propylene ester of fatty acids, and is mainly used as food emulsifier; Propylene glycol is a good solvent for flavorings and pigments. Propylene glycol is commonly used as solvents, softeners and excipients, etc. in the pharmaceutical industry for the manufacture of various types of ointments and salves. Propylene glycol is also used as a solvent and a softener for cosmetic since it has good mutual solubility with various spices. Propylene glycol is also used as tobacco moisturizing agents, antifungal agents, food processing equipment lubricants and solvents for food marking ink. Aqueous solution of propylene glycol is an effective anti-freeze agent.
7. It is used as a drug carrier, and agents for drug particles. It can be used as humectants, softeners, solvents and the like in cosmetics. It can be used as tobacco flavor, tobacco moisturizing agents, preservatives and the like in the tobacco industry. It can be used as flavor, food coloring solvents, food packaging softeners, food release agent and the like in food industry. It can also be used for the production of unsaturated polyester resins, and is also raw materials for plasticizers, dehydrating agents, surfactants, curing agents and binders. It can also be used in paints, pesticides, coatings and other industries.
8. It is used in aviation de-icing fluid, refrigerant and antifreeze, food and spices, fragrances, cosmetics and personal care products, heat transfer fluids, hydraulic and brake fluids, paints and coatings, pet food/animal feeding stuffs, medicines, polyurethane, unsaturated polyester resin and the like.

Reactivity Profile

1,2-Propanediol is hygroscopic. 1,2-Propanediol is sensitive to excessive heat (tends to oxidize at high temperatures). 1,2-Propanediol can react with oxidizing materials. 1,2-Propanediol is incompatible with acid chlorides, acid anhydrides, chloroformates, and reducing agents. 1,2-Propanediol dissolves many essential oils. A mixture of 1,2-Propanediol with hydrofluoric acid and silver nitrate was put in a glass bottle which burst 30 minutes later.


FAO/WHO (2000): ADI is 0 to 25mg/kg.
LD50 is 22 to 23.9 mg/kg (mouse, oral).
GRAS (FDA, §184.1666, 2000).

Brand name

Sentry Propylene Glycol (Union Carbide); Sirlene (Dow Chemical).

Purification Methods

Dry the diol with Na2SO4, decant and distil it under reduced pressure. [Beilstein 1 IV 2468.]

Storage characteristics

Ventilated warehouse and low-temperature drying.

Content analysis

A 10μl sample is injected into the gas chromatograph, which has a thermal conductivity detector. The column is 1m × 6.35mm stainless steel column. The filler is polyethylene glycol 20M (Carbowax compound 20M) 4%, and the carrier is a 40/60 mesh sieved polytetrafluoroethylene (Chromosorb T) or similar material. Helium carrier gas has a flow rate of 75ml/min. Injector temperature is 240 °C; column temperature is 120 to 200 °C, temperature increment is 5 °C/min; final temperature is 250 °C. Under specified conditions, the residence time of propylene glycol is about 5.7 minutes, the residence time of three kinds of glycol isomers are respectively 8.2, 9.0 and 10.2 minutes. The area of each peak is determined using any proper method, and then the percentage of propylene glycol area is calculated and transformed into mass percentage.

Explosive hazardous characteristics

explosive when mixed with air

Fire Hazard

1,2-Propanediol is combustible.

General Description

Thick odorless colorless liquid. Mixes with water.

Contact allergens

Propylene glycol is used as a solvent, a vehicle for topical medicaments such as corticosteroids or aciclovir, an emulsifier and humectant in food and cosmetics, and as antifreeze in breweries, in the manufactures of resins. It was present as an occupational sensitizer in the color film developer Flexicolor?. Patch tests in aqua are sometimes irritant.

Use limitation

FAO/WHO (1984): Cottage cheese, the cream mixture amount of 5g/kg (used alone or in combination with other carriers and stabilizers).
Japan (1998): Raw noodles, raw stuffing and cuttlefish smoked products ≤2%; skins for dumplings, steamed dumplings, spring rolls and wonton ≤1.2%; other food ≤0.6%.
GB 2760-96: pastry 3.0g/kg, chewing gum.
FDA, §184.1666 (2000): Alcoholic beverages 5%; frosting and candy 24%; frozen dairy 2.5%; flavoring agents, flavor enhancers 97%; nuts and nut products 5%; other food 2.0%.

Medicinal property and application

Propylene glycol has good solubility and less toxicity and irritation, and is widely used as solvents, extraction solvents and preservatives for injections (eg. intramuscular injections, intravenous injections) and non-injectable pharmaceutical preparations (such as oral liquid, ophthalmic preparations, otic preparations, dental preparations, rectovaginal preparations, transdermal preparations, etc.). It is better than glycerol solvent and can dissolve many substances such as corticosteroids (sex hormone), chloramphenicol, sulfonamides, barbiturate, reserpine, quinidine, corticosterone acetate, tetrahydropalmatine sulfate, mechlorethamine hydrochloride, vitamin A, vitamin D, many volatile oils, most of the alkaloids and many local anesthetics.
Propylene glycol is similar to ethanol when used as a bacteriostatic agent, and its efficacy to inhibit mold is similar to glycerin and is slightly lower than that of ethanol. Propylene glycol is commonly used as a plasticizer for the aqueous film coating materials. Its mixture with equal amounts of water can delay the hydrolysis of certain drugs, and increase the stability of the preparation product. It is used as an antimicrobial preservative in 15% to 30% propylene glycol solution and semi-solid formulation, as humectants in about 15% propylene glycol topical formulation, and as solvent and co-solvent in 10% to 30% propylene glycol aerosol solvent, 10% to 25 % propylene glycol oral solution, 10% to 60% injectable formulation and 5% to 80% topical formulation.
[Stability and storage condition] It is very stable at room temperature, but is oxidized when left open at high temperatures (above 280 °C); has a chemical stability after mixing with 95% ethanol or water; can be sterilized by autoclaving or sterile filtration. Propylene glycol has hygroscopicity, and should be positioned at cool and dry place and stored in dark airtight container.
[Incompatibility] It has incompatibility with some oxidants (such as potassium permanganate).
The above information is edited by the Chemicalbook of Jin Yinxue.

Acute toxicity

Oral-rat LD50: 20000 mg/kg; Oral-Mouse LD50: 32000 mg/kg

Health Hazard

Liquid may irritate eyes.

Toxicity grading

low toxicity

Synthesis method

It can be obtained by hydrolysis of Propylene oxide:
Direct hydration
Propylene oxide and water are fed in a molar ratio of 1: 15, and react at 150-2000 °C, a pressure of 1.2-1.4 MPa for 30 minutes to obtain 16% aqueous solution of propylene glycol, which is subjected to evaporation to obtain the finished product.
Catalyzed hydrolysis
The reaction is performed under catalyzation of sulfuric acid or hydrochloric acid. 0.5% to 1.0% dilute sulfuric acid is added into 10% to 15% aqueous solution of propylene oxide, the mixture is hydrolyzed at 50 to 70 °C; the hydrolysate is neutralized and concentrated under reduced pressure, and refined to obtain the finished products.
The preparation method is a method in which propylene oxide is hydrolyzed to propylene glycol, and which can be carried out in the liquid phase. There are catalytic and non-catalytic processes in industry. Catalytic method is a method in which hydrolysis is carried out in the presence of 0.5% to 1% sulfuric acid at 50 to 70 °C. Non-catalytic process is carried out under high temperature and pressure (150 to 300℃, 980 to 2940kPa), and is used for production in domestic.


Used as a solvent.

Air & Water Reactions

Water soluble.


flammable liquid

Chemical Properties

clear viscous liquid

57-55-6 Well-known Company Product Price

Brand (Code)Product description CAS number Packaging Price Detail
Sigma-Aldrich (398039)  1,2-Propanediol  ACS reagent, ≥99.5% 57-55-6 398039-2L 2,127.06CNY Detail
Sigma-Aldrich (398039)  1,2-Propanediol  ACS reagent, ≥99.5% 57-55-6 398039-500ML 682.11CNY Detail
Sigma-Aldrich (398039)  1,2-Propanediol  ACS reagent, ≥99.5% 57-55-6 398039-25ML 374.40CNY Detail
Sigma-Aldrich (12279)  1,2-Propanediol  analytical standard 57-55-6 12279-5ML-F 993.33CNY Detail
Sigma-Aldrich (12279)  1,2-Propanediol  analytical standard 57-55-6 12279-1ML-F 255.06CNY Detail
Sigma-Aldrich (55417)  1,2-Propanediol  analytical reference material 57-55-6 55417-1ML 553.41CNY Detail
USP (1576708)  Propyleneglycol  United States Pharmacopeia (USP) Reference Standard 57-55-6 1576708-5X1ML 4,647.24CNY Detail
Sigma-Aldrich (Y0001547)  Propyleneglycol  European Pharmacopoeia (EP) Reference Standard 57-55-6 Y0001547 1,880.19CNY Detail
Sigma-Aldrich (82280)  1,2-Propanediol  puriss. p.a., ACS reagent, ≥99.5% (GC) 57-55-6 82280-1L 1,519.83CNY Detail
Sigma-Aldrich (82280)  1,2-Propanediol  puriss. p.a., ACS reagent, ≥99.5% (GC) 57-55-6 82280-250ML 579.15CNY Detail
Sigma-Aldrich (82280)  1,2-Propanediol  puriss. p.a., ACS reagent, ≥99.5% (GC) 57-55-6 82280-200L 0.00CNY Detail
Sigma-Aldrich (PHR1051)  Propyleneglycol  pharmaceutical secondary standard; traceable to USP 57-55-6 PHR1051-1.5G 732.19CNY Detail



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017


1.1 GHS Product identifier

Product name propane-1,2-diol

1.2 Other means of identification

Product number -
Other names 1,2-Propanediol

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Enzymes and Enzyme Stabilizers;Solvents
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:57-55-6 SDS

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