the moulds made by a mate of me.
once polyurethan´s polymerisation is done,you cant melt it again,you have to use 2-component-resin.
that thing is actually just bolted together,wich gives the shape of the pads.
i took my measurements from echo cnc pad refills and designed the cad to it.
afaik those are the ones which have the biggest recesses,so its basically aimed at having pads that can be cut to every other backing.
the mould is only to be pre-heated to 80° C,the curing time of the PU is around an hour,and steel would hold most of the temperature for long enough to get a homogene cured pad.
if not,i have an old microwave oven that i could use for post-curing.
you didnt really read the whole topic did you?