Preservatives: Optiphen ND or Rokonsal ND

Optiphen ND is a liquid broad spectrum preservative with the INCI Phenoxyethanol (79% to 81%), Benzoic Acid (11.5% to 12.5%) Dehydroacetic Acid (7.7% to 8.5%). It is suitable for products containing water and can be added at any point in the product making process as it isn't heat sensitive. It is best used with products with a pH under 6.0. It's paraben free and isn't a formaldehyde donor.

We know benzoic acid has moderate bactericidal activity and great fungicidal activity, and we know that phenoxyethanol has great bacteria and yeast killing abilities, but we don't know anything about dehydroacetic acid. What does it do?

Dehydroacetic acid is one of our organic acids. It has great fungicial properties but low bactericidal properties, so it's a good addition to this mix to make it a broad spectrum preservative. Unfortunately, it tends to work very poorly when included at a pH of 5.0, and it can be inactivated easily by cationics, non-ionics, and proteins.

Summary of Optiphen ND:
INCI: Phenoxyethanol (and) Benzoic Acid (and) Dehydroacetic Acid.
Usage at 0.2% to 1.2% in any phase of your creation.
Suitable for creations containing water. Not suitable for anhydrous products.
May not be suitable for products that include cationic polymers or quaternary compounds.
Best used in products with a pH lower than 6.0.