1,2-Pentanediol (PG), also known as monopropyl alcohol and 1,2-dihydroxypropane, is a small molecule organic compound with the chemical formula C3H8O2. Under normal conditions, it is a colorless, odorless, slightly toxic, viscous and water-absorbing liquid with good stability and water-absorbing property.
【CAS】57-55-6 Molecular formula:C3H8O2 Relative molecular mass:76.09
Structural formula:
一．Product Property
1,2-Pentanediol can be prepared through methods such as hydration of propylene oxide, hydrolysis of 1,2-dichloropropane, and oxidation of propylene. It possesses properties such as lubrication, moisturizing, penetration, and solubilization.
二．Quality Index:
| Parameter | Specification (USP/FCC/EU) | Test Method |
| Purity (C₃H₈O₂) | ≥ 99.5% (w/w) | GC (USP <831>) |
| Water Content | ≤ 0.2% (w/w) | Karl Fischer (USP <921>) |
| Specific Gravity (25°C) | 1.035 – 1.040 | Pycnometer (USP <841>) |
| Refractive Index (20°C) | 1.431 – 1.434 | Refractometry (USP <831>) |
| Acidity (as Acetic Acid) | ≤ 0.005% (w/w) | Titration (USP <401>) |
| Chlorides | ≤ 0.007% (w/w) | Silver Nitrate Test |
| Sulfates | ≤ 0.006% (w/w) | Barium Chloride Test |
| Heavy Metals (as Pb) | ≤ 5 ppm | ICP-MS (USP <232>) |
| Arsenic (As) | ≤ 3 ppm | ICP-MS (USP <233>) |
| Residue on Ignition | ≤ 0.007% (w/w) | Gravimetry (USP <281>) |
| Oxidation Substances | Passes test (≤ 20 ppm as H₂O₂) | Permanganate Time Test |
| Microbial Limits | Total Aerobic Count ≤ 100 CFU/g | USP <61> |
| Yeast & Mold | ≤ 10 CFU/g | USP <61> |
| E. coli, Salmonella | Absent in 10g | USP <62> |
三．Application scope and Usage
Food-grade propylene glycol is a colorless, transparent, and non-precipitating viscous liquid. It is widely used in the food industry. According to national standards, it is approved as a food additive and is mainly used as a stabilizer, emulsifier, and solvent. It is commonly found in products such as bread and cream. Propylene glycol has good hygroscopicity and antifreeze properties, which can maintain the moisture and freshness of food. In addition, it can also be used in beer processing and the extraction of aroma substances.
四．Package and Storage
The product is packaged in plastic drums, with a specification of 215kg per drum, or in accordance with the packaging specifications requested by the customer.
It is extremely stable at room temperature, but oxidized when exposed to high temperatures (above 280℃); when mixed with 95% ethanol or water, it has chemical stability; it can be sterilized by heat pressing or filtration sterilization. Propylene glycol is hygroscopic and should be stored in a cool, dry place, in a light-proof and sealed container.
五． Safety Protection:
Safety operation measures: Avoid inhalation or contact with this product. It can only be used in an area with good air circulation. After handling or using, thoroughly clean with water.
