II 2 G IIB (or IIC) T4 Gb
NEC 500: Class I, Div. 2, Groups B, C and D
NEC 505: Class I, Zone 1, AEx d e ib px IIB or IIB+H2
ASTM D2386, ASTM D2500, ASTM D1015
DIN ISO 3013
The freeze point as well as the cloud point are both important cold properties which need to be monitored by operators. A matter of fact is that cloud point and freeze point can be detected with one analyzer as the principle of detection is identical. The di erenc between the two properties is defi ned by the actual sample behavior. The sample e.g. gasoil is cooled down and below a certain limit small crystals start to appear, which results in a certain degree of cloudiness of the sample. At that point the so called Cloud Point temperature is determined via reduction of light intensity through an optical path. The cooling process is stopped and the crystals dissolve again. At that point the sample becomes clear and transparent again. As soon as all crystals have dissolved the so called Freeze Point temperature has been reached.
These cold properties are important also for the aviation industry, hence jet fuels and other aviation gasolines to avoid fi lter clogging or irregular combustion characteristics during operation of turbines. The same applies also to mainly gasoils and diesel products.