 |
 |
 |
 |
 |
 |
 |
 |
METHYL PARABEN IP/BP/ USP C8H8O3 M.W. 152.15 |
| Chemical Name | Methyl Hydroxy benzoate. |
| Technical Information | White crystalline powder.1g dissolved in 400 ml of water; 40ml of warm oil; about 70 ml of warm glycerol, freely soluble in alcohol, acetone & ether. Melting Point : 125 - 128 oC Boiling Point : 270 - 280 oC (Decomposition) |
| Typical Analysis | |
| Description | Colourless crystals or white crystalline powder. |
| Odour | Odourless or has a faint characteristic odour. |
| Organic Volatile Impurities | Passes test |
| Acidity | 0.2g dissolved in 250 ml of hot CO2 free water, cooled and titrated with 0.1N Sodium Hydroxide using methyl-red solution as indicator requires not more than 0.1 ml of N/10 NaOH solution. |
| Melting Range | 125 oC to 128 oC |
| Residue On Ignition | 0.05% (max), U.S.P. |
| Chloride | 500 ppm |
| Sulphated Ash | 0.1% (max) |
| Sulphate | Practically Nil. |
| Clarity & Colour of solution | Passes test. |
| Related Substance | Passes test. |
| Loss on drying | 0.05%(max) U.S.P. |
| Assay | 99.0% (min) of C8H8O3 with reference to substance dried at 80 oC for 2 hours. |