Rubber products (pads) appear white, just like mildew, and the ingredients are the same as before, starting in September last year,
If, as you say, the material is the same, it has only recently been discovered
Please ensure that the vulcanization time is long enough and that the two vulcanization time is sufficient, which will effectively improve the problem
The possible reason is to steal sulfur, is the curing time is not enough, the chemical composition of rubber added during the curing process is not fully volatile, so after a period of time will be the formation of white powder in the chemical composition of volatile products to surface crystallization.
