Why the silicone pad is non-durable？

Many customers always think about why the silicone pad is non-durable?In fact,this problem is caused not by the pad printing silicone rubber itself,but in the process of filtering,the filtering handled not properly and impurities are not all filtered out,or in the process of packing as containers not cleaned thoroughly. 　　Some customers do not know well about the performance of silicone rubber. Actually,the durability of printing pad is closely related to the size of printing pattern.Some factories do not want to take the trouble to change the printing pad.While in fact,for large pattern,large silicone pads should be used, otherwise,use small one.Generally,the ratio of the silicone pad to printing pattern is 3:1.   　　In addition,as the silicone oil will break the molecular chain of the silicone rubber.More silicone oil added,softer the pad printing will be, meanwhile nondurable and easy aging it will also turn to be.