Lotion

So here's my formula:

Water.........................................q.s to 100
Ultrez-30...................................0.2
EDTA..........................................0.05
Sodium Lactate...........................2.0
Glycolic Acid...............................1.0

Cetyl Stearyl Alcohol...................2.0
Glyceryl Stearate.........................2.0
Isononyl Isononanoate................2.0
Petrolatum..................................0.5
Dimethicone...............................1.0
Ceteareth-20..............................1.0
Caprylic/Capric Triglyceride........1.5


TEA............................................0.3
Cabosil......................................0.5
Tospearl....................................2.0
BTD 401....................................1.0


Euxyl PE....................................0.3
Vit. E........................................0.5
Alpha-Arbutin.........................0.2
Suncat DE................................1.5
Fragance..................................0.95


The problem here's that it feels "sandy". Is there any problem with the formula or the materials used? 

Comments

  • PerryPerry Administrator, Professional Chemist
    There is nothing obvious to me that would cause that. Although by "sandy" I'm assuming you mean gritty.

    To figure it out, conduct a knockout experiment.
  • Chemist77Chemist77 Member, PCF student
    Run knock outs with Tospearl and then BTD 401, or maybe you need homogenization of those powders.
  • could be Cabosil
  • LaineeLainee Member
    edited July 2017
    @DRBOB@VERDIENT.BIZ should I remove cabosil and tospearl? I feel that it is not needed. Although my superior insists. 

    I need to prove him wrong. 

    @Perry could I use veegum and ultrez together?
  • LaineeLainee Member
    @Chemist77 I think BTD 401 is used in creams and lotions. By any chance, is there any alternatives?
  • Lainee  Yes i would remove particularly cabosil as it has no reason for being and both may be  your grit problem.I dont think homogenizer will do it.You need to mix in a ball mill to grind particles similar to paint coatings:using Hegerman grind gauge until smooth.
  • Chemist77Chemist77 Member, PCF student
    I think Dr. Bob has given a perfect reply, my mistake that I spoke of homogenizer. Can you check if uou can get a smaller size or maybe micronized if you are not willing to remove it. 
  • LaineeLainee Member
    @DRBOB@VERDIENT.BIZ @Chemist77 Update: I removed Cabosil and Tospearl. Put BTD on a miller. The result is pretty fine to me.

    I heard my coworker uses the same formula but she keeps on adjusting TEA.  TEA is a pH adjuster right? 

    I have the desired pH with that percentage of TEA in my new formulation
  • Chemist77Chemist77 Member, PCF student
    That's been used to neutralize for the carbomer here but it is a pH buffer as well.
  • PerryPerry Administrator, Professional Chemist
    Usually, you neutralize Carbomer with a 1:1 ratio of TEA:Carbomer. But it really depends on the pH of your formula & other ingredients.
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