The solution silica gel mold always changes form the reason which method the mold rubber distorts mainly to have: First, the mold rubber's lining shell does insufficiently accurately. Second, before the mold silica gel does not have the full solidification, put into the use. Although after pouring the mold, generally may take out the mold in several hours, but the mold rubber full solidification takes above at least generally one week, if the time permission telephone, the experienced person usually must pour mold one month later only then to take out the appearance to start to use the mold. Third, after each time mold use, has not put in the soft nature silica gel mold in the flinty lining shell to preserve immediately. Fourth, the mold receives the long time in the use process the distortion pressure. Fifth, uses the mold silica gel quality is too bad, either the shrinkage is too high or the filling material are too many (reduces mold rubber cost) the upscale mold rubber shrinkage is 0.1%, what is ordinary is about 3%, the difference mold rubber shrinkage is higher
