MT 48 - Stability of tar oil products
Content Handbook F
Outline of method
48.1 Undiluted miscible type
The product is stored at -10°C for 16 h and is examined for the presence of cloudiness and deposits. It is then warmed to 0°C and rapidly poured into ice-cold, distilled water. The mixture is allowed to stand at room temperature for 4 h and is examined for the separation of oil, then poured through a sieve and the sieve examined for any material retained e.g. crystalline or slimy deposits.
48.2 Stock emulsion type
A sample is cooled to -5°C for 48 h and is then examined for traces of separated oil and sediment. It is then heated to 20°C for 1 h, poured into distilled water at the same temperature, and allowed to stand for 4 h. The amount of oil that has separated is noted. The mixture is then poured through a sieve which is examined for any material retained e.g. crystalline or slimy deposit.