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01.
The amount of water to be mixed with 100 g of gypsum should be 70 ml.
02.
Mixing should be done for about five to seven minutes, until the viscosity of the slurry rises slightly.
03.
If possible, use a silicon rubber model for complex shapes.
04.
Thoroughly dry the model at a temperature below 45¡ÆC.
05.
Submerge the model in hot water with a temperature of more than 80¡ÆC, then start the collapsing method.
If the water temperature goes down, the effectiveness of collapsing is reduced.
06.
Using a hose, spray the pressurized hot water onto the gypsum model to reduce the collapsing time.
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