Silicone mold size cavity effecting hardening process

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Garden Gives Me Joy

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I believe I am seeing a patter across 3 slightly different brine soap batches so far with these molds. I pour a single batter into both (that smaller for samples). However, I notice that the small sample bars take considerably longer than the large ones to harden enough before I can unmold. Is this normal? In one case the big bars were ready to be unmolded within about 9 to 12 hours. However, I needed to wait for over 24 hours to unmold the sample bars.

Can I do anything to speed up the hardening of the small sample bars? Would insulating them somehow help? On a slightly different note, when I increased my batch sizes, I noticed that the lye water temperatures rose higher than it did with less mass. So I wonder whether something similar is happening.

FYI, the large cavities hold roughly 130 g while the small holds roughly 20 g.

Molds - cavity capacity relates to hardening process of CP soap.jpeg
 

TheGecko

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I made some miniature donuts...took a week for them to harden. I have notice with making smaller size soaps...2oz or less...that they need more time in the mold. I would like to say that it's because the smaller amount of soap doesn't generate heat, but I make GMS and refrigerate it with no real problems.

When I was making wedding soaps (lots of detail), I found it helpful to double my Sodium Lactate and increase my Lye Concentration. You could try that. You could place the molds on a heating pad on low for an hour. You could put the molds on a cookie sheet and CPOP*** them.

***CPOP - Heat your over to 170F, turn off, put in soap and leave overnight.
 
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I agree with @TheGecko and would add that I use a heating pad under my cavity molds, and I put an insulated cooler over the top of all that. I only leave the heating pad on for an hour, which builds up enough heat inside the inverted cooler that the soaps usually gel and harden within 12 hours.
 

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