Products Description of Propylene glycol CAS# 57-55-6
Propylene glycol is a low-toxicity, highly stable hygroscopic viscous liquid under normal temperature and storage conditions. It is fully miscible with water, ethanol, methanol and most common organic solvents, with low volatility and weak corrosiveness to most metal materials.
Key technical indicators:
- Melting/Freezing Point: -59~-60 ℃
- Boiling Point: 187.4 ℃ (101.3kPa)
- Relative Density (20℃): 1.036~1.040
- Refractive Index n20/D: 1.431~1.433
- Closed Cup Flash Point: 99~104 ℃
- Vapor Pressure (20℃): 0.11 hPa
- pH Value (100g/L aqueous solution): 6.0–8.0
- Chemical Compatibility: Compatible with most cosmetic, food and pharmaceutical raw materials; acts as universal humectant, solubilizer and formulation stabilizer
- Safety Feature: Recognized as GRAS (Generally Recognized As Safe) by FDA, suitable for direct contact food and medical formulations
Parameters
| Parameter | Value |
| Melting point | -16 °C(lit.) |
| Boiling point | 188 °C(lit.) |
| density | 1.036 g/mL at 25 °C(lit.) |
| vapor density | 2.62 (vs air) |
| vapor pressure | 0.08 mm Hg (20 °C) |
| refractive index | n20/D 1.432(lit.) |
| Fp | 225 °F |
| storage temp. | Store at +5°C to +30°C. |
| solubility | Miscible with water |
| pka | 15.9 |
| form | Liquid |
| color | Colorless |
| Odor | Practically odorless |
| explosive limit | 2.6-12.5%(V) |
| Water Solubility | Fully miscible |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| LogP | -0.92 |
| CAS DataBase Reference | 57-55-6(CAS DataBase Reference) |
Safety Information
| Item | Value |
| Hazard Codes | None |
| Risk Statements | None |
| Safety Statements | 24/25 |
| RIDADR | UN 3082 |
| WGK Germany | 1 |
| RTECS | TY6300000 |
| Autoignition Temperature | 716 °F |
| TSCA | Yes |
| HS Code | 29053200 |
| Toxicity | LD50 orally in rats: 20 g/kg |
Product Application of Propylene glycol CAS# 57-55-6
This multi-functional diol raw material serves cross-industry demands, unified sorted without repeated description:
Cosmetic & Personal Care Industry
Core humectant, solubilizer and active ingredient carrier for facial creams, lotions, masks, hair care products and makeup. It optimizes product texture, locks skin moisture and improves system homogeneity.
Food & Beverage Industry
Approved food additive (E1520) functioning as humectant, flavor carrier, anti-freezing agent and stabilizer for baked goods, candy, beverages and food essences.
Pharmaceutical Industry
Widely used as solvent, excipient and lubricant for oral liquids, topical ointments, suppositories and external medical preparations to boost ingredient solubility and product stability.
- General Industrial Manufacturing
- Primary raw material for non-toxic antifreeze and heat transfer fluids for heating & cooling circulation systems
- Fundamental chemical intermediate for synthesizing polyesters, plasticizers, emulsifiers and fine chemical additives
Factory and Equipment Show
Fast delivery time
Inventory 2-3 working days New production 7-10 working days
FAQ
Q1: Can I test your propylene glycol samples before bulk order?
A1: Yes, we provide free lab samples of industrial, food and pharmaceutical grades for your quality verification. You only need to cover the sample shipping cost, and the sample expense will be fully deducted from your subsequent formal bulk order. All samples come with complete COA data for reference.
Q2: What differences between food grade and industrial grade propylene glycol? Can you customize special specifications?
A2: Food/USP grade has purity ≥99.5% with strict limits on heavy metals, ash and moisture, compliant with FCC, USP and global food safety standards for edible and medical use. Industrial grade (≥95% purity) is cost-effective for antifreeze, chemical synthesis and coating raw materials. We support customized purity, color and impurity indicators according to customers’ specific formulation requirements.
