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Pour Temperature and Hardness
Can someone please explain why the hotter you pour, let’s say a lipstick, the harder the bullet? Been trying to search and try to understand for a clear explanation, but I haven’t found one.
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2 Replies
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This is actually only true for some formulations. For others, the opposite is true.
The explanation is something that you’ll probably never see published - it has to do with the way the waxes crystallize/solidify in the sticks. -
http://www.dweckdata.com/Published_papers/Lipstick_moulding_C&T.pdf and more particularly:
http://www.dweckdata.com/Published_papers/Sweating_Lipsticks.pdf … might indicate the reasons for the hardening of the outer surface, with respect to pour temperature, and formulation.
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