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Specific gravity of Lipstick bulk
What a good method to measure the specific gravity of lipstick bulk? Currently using a gravity cup and finding some discrepancies and long clean up process.
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2 Replies
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We’ve been through this many times before. Measure mass in a 100ml graduate cylinder to the line precisely at 60C both (liquid) product and water. Although the expansion coefficients are not same, this will NOT affect the SpG value significantly. Clean-up? Just pour out your lipstick and chase the cylinder with chloroform or methylene chloride (in a fume hood preferably.)
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Unless you have a good method that can be duplicated, I would suggest sending it out to an analytical testing lab to get the results. It’s less than $100 last time I checked.
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