Product Center

Physical Properties

1. Appearance: Colorless, viscous, stable, hygroscopic liquid, almost odorless and tasteless, flammable, low toxicity.

2. Boiling Point (ºC, 101.3 kPa): 187.3

3. Melting Point (ºC, Pour Point): -60

4. Relative Density (g/mL, 20/20ºC): 1.0381

5. Relative Density (20℃, 4℃): 1.0362

6. Refractive Index (n, 20ºC): 1.4329

7. Viscosity (mPa·s, 0ºC): 243

8. Viscosity (mPa·s, 20ºC): 56.0

9. Viscosity (mPa·s, 40ºC): 18

10. Flash point (ºC, closed cup): 98.9

11. Flash point (ºC, open cup): 107

12. Ignition point (ºC): 421.1

13. Heat of combustion (kJ/mol, isobaric): 1827.5

14. Heat of combustion (kJ/mol, isovolic): 1825.0

15. Heat of combustion (kJ/mol, 20ºC, 101) 16. Heat of vaporization (kJ/kg): 538.1

17. Heat of formation (kJ/mol, 20ºC): 500.3

18. Specific heat capacity (kJ/(kg·K), 20ºC, isobaric): 2.48

19. Critical temperature (ºC): 351

20. Critical pressure (MPa): 5.9

21. Thermal conductivity (W/(m·K)): 0.217714 22. Lower Explosive Limit (%, V/V): 2.6

23. Upper Explosive Limit (%, V/V): 12.5

24. Coefficient of Expansion (K⁻¹, 20ºC): 0.000695

25. Coefficient of Expansion (K⁻¹, 55ºC): 0.000743

26. Vapor Pressure (kPa, 55ºC): 0.19

27. Solubility: Miscible with water, ethanol, ether, chloroform, acetone, and many other organic solvents. While its solubility for hydrocarbons, chlorinated hydrocarbons, and oils is low, it is stronger than that for ethylene glycol.

28. Relative density (25℃, 4℃): 1.0328

29. Refractive index at room temperature (n25): 1.4314

30. Solubility parameter ((J·cm⁻³)¹/²): 29.516

31. Van der Waals area (cm²·mol⁻¹): 6.960 × 10⁹

32. Van der Waals volume (cm³·mol⁻¹): 46.760

33. Standard heat of combustion in the gas phase (enthalpy) (kJ·mol⁻¹): -1902.55

34. Standard claimed heat of combustion in the gas phase (enthalpy) (kJ·mol⁻¹) 35. Standard enthalpy of combustion in liquid phase (kJ·mol⁻¹): -1838.14

36. Standard enthalpy of claim in liquid phase (kJ·mol⁻¹): -485.72

37. Standard heat of melt in liquid phase (J·mol⁻¹·K⁻¹): 189.9

Applications

1,2-Propanediol is an important raw material for unsaturated polyesters, epoxy resins, polyurethane resins, plasticizers, and surfactants, accounting for approximately 45% of total propylene glycol consumption. This unsaturated polyester is widely used in surface coatings and reinforced plastics. 1,2-Propanediol has good viscosity and hygroscopicity, and is widely used as a humectant, antifreeze, lubricant, and solvent in the food, pharmaceutical, and cosmetic industries. In the food industry, 1,2-Propanediol reacts with fatty acids to form propylene glycol fatty acid esters, mainly used as food emulsifiers; 1,2-Propanediol is also an excellent solvent for flavorings and colorings. Due to its low toxicity, 1,2-propanediol is used as a solvent for flavorings and food colorings in the food industry. In the pharmaceutical industry, it is commonly used as a solvent, softener, and excipient in the manufacture of various ointments and creams. It is also used as a blending agent, preservative, and solvent for ointments, vitamins, and penicillin. Because of its good miscibility with various flavorings, propylene glycol is also used as a solvent and softener in cosmetics. 1,2-Propanediol is also used as a tobacco humectant, a mildew inhibitor, a solvent for lubricating oils in food processing equipment, and a solvent for food marking inks. Aqueous solutions of 1,2-propanediol are effective antifreeze agents. It is also used as a tobacco wetting agent, a mildew inhibitor, a fruit ripening and preservative, an antifreeze, and a heat transfer fluid.