Effect of humidity on calcium sulphate hemihydrate.

Abstract:

:The conversion of calcium sulphate hemihydrate powders to dihydrate by reaction with atmospheric water vapour has been re-examined gravimetrically. Storage is usually said to be safe at less than '70 per cent RH', but this is shown to be an inadequate criterion (water vapour pressure being more useful in the context) and based on an inappropriate experiment. At 23 degrees C, greater than about 2.3 kPa water vapour pressure caused rapid reaction, and this may be taken as a more reliable critical value.

journal_name

Aust Dent J

authors

Torrance A,Darvell BW

doi

10.1111/j.1834-7819.1990.tb05399.x

subject

Has Abstract

pub_date

1990-06-01 00:00:00

pages

230-5

issue

3

eissn

0045-0421

issn

1834-7819

journal_volume

35

pub_type

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