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EC number: 220-912-4
CAS number: 2935-90-2
A preliminary test was performed to check
the approximate freezing temperature of 3 - mercaptopropanoic acid
methyl ester (MMP). The test item was stored at -18 degrees C in a deep
freezer. As the sample was not frozen after storage for 22 hours, the
freezing temperature of 3 -mercaptopropanoic acid methyl ester (MMP) is
below -18 degrees C.
The determination of the freezing
temperature with thermocouples showed no heat effect from which freezing
can be deduced. Therefore, the phase transformation was determined
During the tests, 7 mL of the test item
placed in a small test tube were cooled down from room temperature to
about -70 degrees C using a dry ice and acetone mixture. Until -60 degrees
C, the appearance of the test item was unchanged. At -64 degrees C, the
test item becomes turbid. At -69 degrees C, the test item was more
viscous, but still movable.
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