Molekula
Propylene Glycol USP
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Propylene Glycol USP is a colorless, odorless, viscous liquid used as a solvent, humectant, and carrier in pharmaceuticals, cosmetics, and food products. Industrial uses include antifreeze and deicing fluids for vehicles, boats and aircraft, solvent systems for paints and plastics, and emulsifying applications. It is chemically identified as CH3CH(OH)CH2OH, with a molecular weight of 76.09 g/mol and a CAS number of 57-55-6. It is stable at ambient storage conditions and carries no signal word. Molekula supplies Propylene Glycol USP from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Viscous liquid that is practically odorless and colorless |
| Refractive Index | 1.4310 - 1.4330 |
| Colour (Pt-Co) | ≤5 |
| Water | ≤0.1% |
| Heavy metals | ≤5ppm |
| Specific Gravity | 1.0350 - 1.0370 |
| Sulphated Ash | ≤70ppm |
| Chlorides | ≤1ppm |
| Distillation Range | 185.0 -189.0°C |
| Clarity | 3 |
| Cadmium (Cd) | ≤0.50ppm |
| Iron (Fe) | ≤0.30ppm |
| Lead (Pb) | ≤1ppm |
| Mercury (Hg) | ≤0.10ppm |
| Arsenic (As) | ≤ 2ppm |
| Sulphates (SO4)(2-) | ≤60ppm |
| Acid (Based on acetic acid) | ≤0.0020% |
| Diethylene glycol (%) | ≤0.10% |
| Monopropylene glycol, % | ≥99% |
| Dipropylene glycol, % | ≤0.1% |
| Monoethylene glycol, % | ≤0.10% |
| Neutralisation number, mgKOH/g | ≤0.0100mgKOH/ |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless viscous liquid |
| Odour | Practically odorless |
| Melting Point | -60 °C |
| Boiling Point | 187.6 °C |
| Density | 1.04 (relative, water = 1) |
| Water Solubility | 1000 g/L at 20 °C (miscible) |
| Solubility (other solvents) | Soluble in benzene |
| Vapour Pressure | 10.6 Pa at 20 °C |
| Refractive Index | 1.4324 |
| pKa | pKa = 14.9 |
| log P (octanol/water) | -0.92 |
Source: PubChem CID 1030 (HSDB, DrugBank, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 90033208 |
| CAS Number | 57-55-6 |
| IUPAC Name | propane-1,2-diol |
| EC Number | 200-338-0 |
| Molecular Formula | CH3CH(OH)CH2CH2OH |
| Molecular Weight | 76.09 |
| Exact Mass | 76.0524 |
| SMILES | CC(CO)O |
| InChIKey | DNIAPMSPPWPWGF-UHFFFAOYSA-N |
| InChI | InChI=1S/C3H8O2/c1-3(5)2-4/h3-5H,2H2,1H3 |
| PubChem CID | 1030 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| Tariff Code | 2905320090 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 1,2-dihydroxypropane
- 1,2-propanediol
- 1,2-Propylene glycol
- 2-Hydroxypropanol
- Dowfrost
- Isopropylene glycol
- Methylethyl glycol
- propane-1,2-diol
- propylene glycol
- Sirlene
Frequently asked questions
What is Propylene Glycol USP used for?
It is commonly used as a solvent, humectant, and plasticizer in pharmaceuticals, cosmetics, and food products.
What is the chemical formula and molecular weight of Propylene Glycol USP?
The formula is CH3CH(OH)CH2OH with a molecular weight of 76.09 g/mol.
How should Propylene Glycol USP be stored?
It should be stored at ambient temperature, protected from moisture and contamination.
What grade of Propylene Glycol USP is available?
Molekula supplies Propylene Glycol USP, meeting USP specifications for pharmaceutical use.
Can Molekula supply Propylene Glycol USP in bulk?
Yes, Molekula offers bulk quantities for industrial and commercial applications.
What documentation comes with a purchase of Propylene Glycol USP?
Each order includes a Certificate of Analysis (CoA) and, upon request, a Certificate of Compliance (CoC) or other regulatory documentation.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.