Foaming agents

[Monomer]

Hi all,

We are currently using a foaming agent on a transfer tool from another company. The foaming agent is used to help eliminate the warp. When we cut the part in half we notice that there are not any voids in the part we are molding. When we cut the part in half that the customer supplied we are seeing lots of voids.

We are using a 1% endothermic foaming agent. Is the foaming agent not being activated upon injection? Is there a difference in the foaming agents?