at least 3 8 and at most 8 5 of the size of the corresponding portion of the cavity of mold 1 in the prior art the shrinkage of the external volume of the molded product was less than about 5 8 of the volume of the cavity of mold 1 and in the region of maximum shrinkage the shrinkage of the external size of the body portion of the molded product was at least 1 8 and at most 2 7 of the size of the corresponding portion of the cavity of mold 1 when pp is used the temperature of the body portion of the molded product when it is removed from a mold according to these embodiments is 82 u00b0 c to 85 u00b0 c this removal temperature was measured in the same way as in the case of the hdpe molded products the molded pp product can be removed from the mold at a considerably higher temperature than the conventional mold removal temperature of 46 u00b0 c to 62 u00b0 c when pp is used mold 1 from which molded products can be removed at high temperature has a mold cavity formed so that the external volume of.