Kathon cg+ DMDM hydantoin as preservative for shampoo

If i use kathon cg(1.5% MIT/MCIT) with DMDM hydantoin or formalin as shampoo preservative, how much of each preservative should i use?  

According to data about Lonzaserve® PC from lonza, a blend of <0.1% DMDM hydantoin+ <1ppm MIT/MCIT can preservative shampoo. 
This would be my go to preservative blend if this is true. 

Comments

  • PhilGeisPhilGeis Member, Professional formulator
    edited January 20
    MCIT/MIT and DMDM Hydantoin have the same target segment.  Don't see to much reason to use both - but still limited vs fungi.  But think Unilever has some shampoos with both.

    Lonzaserve PC would certainly be a novel combination.  
  • PerryPerry Administrator, Professional Chemist
    @PhilGeis - I heard they did this because the company they bought (Helene Curtis) had a resident microbial biofilm in the Suave shampoo filling lines which required Kathon to kill.

  • PhilGeisPhilGeis Member, Professional formulator
    Both are on some suave labels.
  • AbdullahAbdullah Member
    edited January 20
    @PhilGeis ; @Perry 

    1. this is the composition of Lonzaserve PC. Is this 71% of 55% DMDM hydantoin solution or 71% DMDM hydantoin solid? 

    What i want to know is how much total formaldehyde is in this mixture.

    2. What percentage of Lonzaserve PC would you recommend in a Shampoo? In one file they recommend v0.05-0.2%. in another file they recommended 0.25-0.5%.

    3. If i add the same amount of MIT/MCIT and formaldehyde (in form of DMDM hydantoin or formalin) as Lonzaserve PC, would it function the same as Lonzaserve PC? 
  • PhilGeisPhilGeis Member, Professional formulator
    Ask Lonza #'s 1 and 2
  • PhilGeis said:
    Ask Lonza #'s 1 and 2
    Thanks
  •  DMDM hydantoin in shampoo. Does not cause scalp irritation??  
     MCIT/MIT +Phenoxyethanol.  not enough? @PhilGeis  
  • PhilGeisPhilGeis Member, Professional formulator
    edited January 21
     DMDM hydantoin in shampoo. Does not cause scalp irritation??  
     MCIT/MIT +Phenoxyethanol.  not enough? @PhilGeis  

    No. 

    With MCIT (at 5ppm) - you don't need phenoxyethanol. Of these, phenoxyethanol would be the least preferred.
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