Euxyl K903, Natural Preservative, 10 ml

Euxy K 903 is a mild and effective preservative for modern cosmetic formulations with a pH up to approximately 6. It provides a broad, well-balanced protection spectrum against bacteria, yeasts and moulds, works excellently also in non-ionic systems and has good efficacy in the vapor phase. It is suitable for leave-on, rinse-off and wet wipes and is easy to incorporate into aqueous or water-glycol bases.

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Key benefits

• Broad-spectrum protection (bacteria, yeasts, moulds) with fast action kinetics.
• Skin-friendly use up to pH ~6; excellent performance in non-ionic systems.
• Good efficacy also in the vapor phase – suitable for products exposed to air (e.g. wipes).
• Mild to the formulation, does not affect colour or scent at correct dosage.
• Liquid form facilitates processing and uniform distribution.

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Suitable for products such as

• Face and body creams, lotions and gels (leave-on)
• Shower gels, shampoos, conditioners (rinse-off)
• Wet wipes and make-up removers
• Sensitive/low-pH formulations up to ~6

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Use in formulation

• Dosage (typically): 0,5 – 1,0 %; practical recommendation 0,4 – 1,2 % depending on product type and risk.
• pH: optimal ≤ 6 (lowering the pH increases efficacy); at pH > 6 it is stable but ineffective.
• Incorporation: pre-dissolve in the water-glycol phase (e.g. propylene glycol), add during cooling below 40 °C.
• Heating: avoid prolonged heating above ~80 °C (> 4 h).
• Compatibility: effective in anionic, non-ionic and cationic systems; with iron ions a yellow discoloration may appear – minimise their presence.
• Aerosols: do not use in aerosol sprays (restriction due to the content of dehydroacetic acid).
• Regulatory limits (overview): EU up to 1,23 % (leave-on and rinse-off)

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Safety and storage

In contaminated systems, allow for a minimum contact time of approximately 48 hours for complete disintegration of microorganisms. Observe production hygiene and use raw materials with low microbial load. Store in the original closed container at room temperature, protected from heat and direct light.

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