Antifreeze glycerol freezing point determination solution
Antifreeze glycerol freezing point determination solution
The freezing point of pure glycerol was 17.9℃. With the increase of water content in glycerol, the freezing point gradually decreased. However, after the freezing point decreased to -46.5℃, if the glycerol content continued to decrease, the freezing point gradually increased
The freezing point of glycerol aqueous solution of different concentrations (% by weight) is: 10%, -1.6℃; 30%, to 9.5 ℃; 50%, to 23.0 ℃; 66.7%, to 46.5 ℃; 80%, to 20.3 ℃; 90%, to 1.6 ℃.
Instruments needed for experiments
1, SH128 automatic freezing point tester, using embedded system design, the whole process of the test automatic detection; Color touch screen; The test results can be stored; Historical data can be viewed; The printed results on the instrument, mechanical automatic stirring, the experimental results can be exported through the U disk, stored in the computer can be tested and compared for many times.
2, alcohol,
3, meet the standard for SHT0090-1991 engine coolant freezing point determination method