Euxyl K 903 Preservative

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Euxyl™ k 903 is a liquid preservative for personal care products, with strong, broad-spectrum efficacy against bacteria, yeasts and molds. This mild blend can be used for certified natural cosmetics, and has good efficacy in the vapour phase.   According to Schulke, the manufacturer, Euxyl® K 903 is particularly effective in nonionic systems.

The natural tocopherol in Euxyl® K 903 is GMO-free and complies with the criteria of NATRUE and COSMOS (including Ecocert) for natural products.

Euxyl® K 903 contains:

  • Benzyl Alcohol            78.0 - 84.0%
  • Benzoic Acid              11.0 - 13.0%
  • Dehydroacetic Acid     6.5 -   7.5%

While Euxyl® K 903 is classified as a "mild" preservative as formulated, the raw material should be handled with care as the full strength preservative causes severe eye irritation and may cause tissue damage.  Read the MSDS before use and follow recommended guidelines for handling, including Safety Goggles!

INCI: Benzyl Alcohol (and) Benzoic Acid (and) Dehydroacetic Acid (and) Tocopherol

Applications:  Leave-on products, Rinse-off products, Wet Wipes, Sensitive skin products.

pH 3 - 6
regulatory compliance Brazil, Canada, China, EU, Japan, Mexico, US
technologies without formaldehyde donor, without halogen, without isothiazolinones, without paraben, without phenoxyethanol
chemistry type with benzylalcohol, with organic acids

Including:  Highly aqueous products (oil in water emulsions - lotions and creams), room sprays, spritzers, toners, shampoo, conditioner and sugar scrubs (anhydrous).

  • Euxyl® K 903 is fully effective both in anionic as well as cationic and non-ionic systems
  • Euxyl® K 903 offers good head space protection in packaging
  • Euxyl® K 903 has limited solubility in water. 100g of water at 20°C will dissolve 1.2g of Euxyl® K 903.
  • Euxyl® K 903 exhibits no interaction with sulphite ions.
  • Euxyl® K 903, in the presence of iron ions, e.g. from mineral thickeners, yellow discoloration of a formulas was observed.
  • The recommended pH range for formulations is between pH 3 - 6.  Efficacy is increased by reducing the pH value of the final formulation. We recommend a pH of 5.0 or 5.5 or lower.
  • Prolonged heating periods greater than 176°F/80°C should be avoided.  It is advantageous to add Euxyl® K 903 in the cooling phase, e.g. with the fragrance, at less than 104°F/40°C.

Recommended use levels: 0.4% - 1.2%.
Appearance: Light yellow to dark yellow liquid (can vary batch to batch)
Solubility: Euxyl® K 903 has limited solubility in water. 100 g of water at 20°C dissolve 1.2 g of Euxyl® K 903. In polar solvents, such as 1,2-propylene glycol, propanol or acetone, Euxyl® K 903 is readily soluble. In polyalcohols, such as glycerol and sorbitol, Euxyl® K 903 is moderately soluble. In aliphates with hydrophilic groups, such as 2-octyldecanol and isopropyl myristate, Euxyl® K 903 has limited solubility. It is slightly soluble in pure aliphatic solvents.
pH as supplied: 3.0 - 4.0 (10g/L @20°C/68°F)
Country of Origin: Germany
Density:  1.067--1.079 g/mL at @20°C/68°F
Storage: Store in a cool dry place out of direct sunlight. Should be stored at a temperature between 8-25°C (46 - 77°F)


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