Difference between Preserve-Free BHL and PHL
Question
I saw the preservatives Preserve-Free BHL and Preserve-Free PHL, which have slightly different names but the information for both substances is written exactly the same. How can I know how they are different? I'm confused about which one to buy. Please explain.
Answer
Based on the product information, the main difference between Preserve-Free BHL and Preserve-Free PHL lies in their composition, specifically the third ingredient listed in the INCI name.
- Preserve-Free BHL contains Caprylhydroxamic Acid, 1,2-Hexanediol, and Butylene Glycol.
- Preserve-Free PHL contains Caprylhydroxamic Acid, 1,2-Hexanediol, and Propanediol.
Both products use the same primary active components for preservation (Caprylhydroxamic Acid and 1,2-Hexanediol), which is why their general descriptions regarding effectiveness, gentleness, and classification as "preservative-free" are identical.
The difference is in the solvent/carrier used: Butylene Glycol in BHL and Propanediol in PHL. Both Butylene Glycol and Propanediol are commonly used in cosmetics as solvents, humectants (to help retain moisture), and texture enhancers. While they have similar functions, some formulators may have a preference for one over the other based on feel, source (Propanediol can be derived from corn), or specific compatibility with other ingredients in their formula.
In summary, the core preservative function is the same for both products. The choice between BHL and PHL would primarily depend on whether you prefer Butylene Glycol or Propanediol as the accompanying ingredient in your formulation.
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