• Formulating

  Specific gravity of Lipstick bulk

  Posted by MichaelR on March 26, 2024 at 9:16 am

  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.

  chemicalmatt replied 2 weeks, 4 days ago 2 Members · 1 Reply
• 1 Reply

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  chemicalmatt

  Member

  April 8, 2024 at 1:20 pm

  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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