Building a Stable Water-Based Formula Without Harsh Preserving Systems
Optiphen ND Preservative in the 10 g pack belongs to the Preservatives and Antioxidants section, which brings together ingredients designed to protect water-containing formulations from bacteria, yeast and mold growth. This preservative is formulated without formaldehyde-releasing agents, which makes it attractive to manufacturers looking for a milder yet broad-spectrum protection option for everyday cosmetic products. The strongest demand for this type of preservative comes from the cosmetic industry, where it is used in creams, lotions, shampoos, gels, wet wipes, hydrosols and liquid soap bases.
Optiphen ND remains active across a fairly wide pH range and tolerates moderate warmth, but for the best long-term stability it should be added during the cool-down phase, once the batch has dropped below roughly 40 degrees Celsius. Adding it too early, while the mixture is still hot, can reduce its protective capacity over time. A common starting dosage is between 5 and 10 grams per kilogram of finished product, with the exact amount adjusted according to water content, formulation complexity and the intended shelf life of the final item.
For formulas containing plant extracts, hydrosols or protein-based ingredients, many formulators pair this preservative with the chelating agent EDTA, which binds metal ions and boosts overall efficacy against gram-negative bacteria. When a formulation calls for a different resistance profile or a broader working range, alternatives such as Sharomix 300 for diverse emulsion types, or Euxyl K 300 for formulas aimed at sensitive skin, are worth considering.
The 10 g pack size is well suited for home-based cosmetic making and small trial batches, allowing a formulator to test the preserving system on a small scale before committing to larger production runs. This size makes it easy to fine-tune dosage across several pilot batches of cream, lotion or facial mist without wasting expensive raw materials. The preservative should be stored in a tightly sealed container, in a cool dry place away from direct sunlight and excess humidity, which keeps it stable throughout its stated shelf life.
It is also worth noting that Optiphen ND is compatible with most emulsifiers, plant oils, hydrosols and active extracts, making it a versatile choice across a wide range of skincare products, from lightweight serums to rich nourishing creams. Compared with some alternatives, it tends to be gentler on sensitive skin, which is why it is frequently chosen for baby care lines and minimalist formulations with a short ingredient list.
Lightweight Facial Mist Serum
Distilled water 160 g
Aloe vera juice 20 g
Glycerin 5 g
Panthenol liquid 3 g
Optiphen ND 1,3 g
EDTA 0,2 g
Rose hydrosol 10 g
Combine
the distilled water, aloe vera juice and rose hydrosol in a clean container and
warm gently to about 40 degrees Celsius to help dissolve the glycerin and
panthenol evenly. Once the mixture cools slightly, stir in the Optiphen ND and
EDTA until fully dissolved, then pour the finished serum into a spray bottle
for daily use.