Table 2.
Specifications for propane‐1,2‐diol (E 1520) according to Commission Regulation (EU) No 231/2012 and JECFA (2006)
| Commission Regulation (EU) No 231/2012 | JECFA (2006) | |
|---|---|---|
| Assay | Content not less than 99.5% on the anhydrous basis | Not less than 99.5% on the anhydrous basis |
| Description | Clear, colourless, hygroscopic, viscous liquid | Clear, colourless, hygroscopic, viscous liquid |
| Identification | ||
| Solubility | Soluble in water, ethanol and acetone | Soluble in water, ethanol and acetone |
| Specific gravity (20°C/20°C) | 1.035–1.040 | 1.035–1.040 |
| Refractive index | [n]D 20: 1.431–1.433 | – |
| Infrared absorption | – | The infrared spectrum of a potassium bromide dispersion of the sample corresponds with the infrared spectrum below [in the specifications] |
| Purity | ||
| Distillation | 99.5% of the product distils between 185°C and 189°C. The remaining 0.5% consists mainly of dimers and traces of trimers from propane‐1,2‐diol | 99% v/v distils between 185‐ and 189°C |
| Water | Not more than 1.0% (Karl Fischer method) | Not more than 1.0% (Karl Fischer) |
| Sulphated ash | Not more than 0.07% | Not more than 0.07% |
| Free acid | – | Add 3–6 drops of phenol red TS to 50 mL water, then add 0.1N sodium hydroxide until solution remains red for 30 s. To this solution, add about 50 g of the sample accurately weighed. Titrate with 0.01N sodium hydroxide until the original red colour returns and remains for 15 s. Not more than 1.67 mL of 0.01N sodium hydroxide are consumed by a sample of 50.0 g |
| Lead | Not more than 2 mg/kg | Not more than 2 mg/kg |