• Formulating

  Preservative and water content

  Posted by davidsotochimex on September 2, 2016 at 3:46 pm

  Is there a recommended amount of preservative (methylchloroisothiazolinone) for a shampoo formulation that is about 67% water? I’m looking for stability that will last at least 6 months. Is this more of a microbiology question?

  Microformulation replied 8 years, 2 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Microformulation

  Member

  September 2, 2016 at 6:02 pm

  The usage level really has nothing to do with the water content but rather more properly the application and if it is leave on or rinse off. Of course MCT should be rinse off. I would pull the manufacturer spec sheets.
  Free water (Aw) which you may be referring to is measured with specialized equipment, not the water portion of the Formula.
  

Log In to Reply