Propylene glycol (PG)
CAS No.: 57-55-6
Formula: C3H8O2
It is a colorless liquid with steady viscosity and good water absorption. It is nearly odorless, uninflammable and minutely toxic. Its molecular mass is 76.09. Its viscosity (20oC), specific heat capacity (20oC) and latent heat of vaporization (101.3kpa) are respectively 60.5mpa.s, 2.49KJ/(kg. oC) and 711KJ/kg. It can be mixed and solved with alcohol, water and various organic agents.
Application:
PG is the raw material for preparing unsaturated polyester resin, antifreeze, etc.It is also a moisture preserving agent for tobacco, cosmetic, etc. Besides, it is a good solvent in coating, paints, and others.
Specification (It conforms to the Quality System Standard: ISO9001: 2000):
Index | High Grade | Technical Grade |
PG content % ≥ | 99.7 | 99.5 |
Moisture % ≤ | 0.10 | 0.20 |
Color (Pt-Co) No. ≤ | 10 | 16 |
Relative density d2020 g/cm3 | 1.035~1.038 | 1.035~1.040 |
Index of refraction(nd20) | 1.431-1.435 | 1.428-1.435 |
Acidity(as acetic acid), % ≤ | 0.01 | 0.02 |
Distillation range(IBP-DP) oC | 184~190 | 183~190 |
Appearance | Colorless, viscous and transparent liquid, no mechanical impurity | |
