When we make silicone molds,It will have the phenomenon of the silicone uncured after 24hrs for some reason.but how can we avoid this phenomenon by control the ratio of silicone and catalyst?
In general, the curing time of molding silicone will be affected by temperature.it will be short with high temperature.conversely,it will be longer than before with low temperature.so please change the ratio of silicone and catalyst when make silicone molds in winter.
the curing time of molding silicone also will be affected the quantity of catalyst.but the ratio of silicone and catalyst can’t less than 1%,because it will not cured for a long time.Just the ratio of catalyst less than 5%,it will not change hardness ,tear strength and tensile strength too much.
- with 1% catalyst,the silicone also is liquid when mixed after 2.5hrs,demold time about 6-8 hrs.
- with 2% catalyst,the silicone also is liquid when mixed after 50-60mins,demold time about 2-3 hrs.
- with 3% catalyst,the silicone also is liquid when mixed after 28-30mins,demold time about 1.5-2hrs.
- with 4% catalyst,the silicone also is liquid when mixed after 10-15mins,demold time about 1-1.5hrs.
Just be sure to stir silicone and catalyst evenly after mixing,otherwise the silicone rubber will not cured completely.And please make molds again if the silicone rubber can’t cured completely within 48hrs,because it will not cured all the time.