BHT

DoreenDoreen Member
in Formulating
I keep seeing BHT listed in the heated oil phase in several formulations.
I know it doesn't dissolve fast at room temperature, but isn't a heated oil phase too close to its melting point? (70C) Won't it chemically break down/decompose?
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Comments

  • em88em88 Member
    Yes, a degradation should happen, reducing its function. 
  • DoreenDoreen Member
    @em88
    Thank you! In what phase would you recommend to put it?
  • em88em88 Member
    I have worked with BHA, which was used for a shampoo.
    We add BHA at 40 C, at the end of the process. We use temperature just to speed up the solubility, after that the process is continued at RT. 
    What if you dissolve it in ethanol and add it at the end? 


  • DoreenDoreen Member
    @em88
    BHA has a lower melting point (48-55C), so I guess I can heat BHT (70C) up to 60C or so?
    I only have isopropyl alcohol, but I see it's (partly) soluble in IPA as well as ethanol (Making Cosmetics).
  • em88em88 Member
    I thought BHT was very soluble in ethanol. I should recheck this. 
    I guess, 60 C heated for a short time should be ok. 
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