I do CPOP soap — which means I put my soap molds in the oven at about 180-200 degrees. The soap mold stays there for 90 minutes. Can your, Triple Loaf soap molds be placed in a warm oven and withstand those temps?
I know people have used our soap molds for Oven Processed but as I recall, it was not more than 180. I cannot recommend it but of course it is strictly your decision how you use them. The utilization Temperature range of HDPE plastic is -180 to + 180, melting point 266.