A formula is not finished when it looks right.

What a developed formula has to survive

Accelerated stability. Elevated temperature storage over defined intervals, with measurement of viscosity, pH, separation, colour and odour at each checkpoint. For mineral systems, particle size distribution is also tracked — a formula can look stable while the dispersion is quietly re-agglomerating.

Freeze-thaw cycling. Particularly relevant for water-based lotions and sprays that may be stored or transported through cold climates.

Pack compatibility. The formula is tested in the actual proposed pack, not a generic glass jar. Pump mechanisms, aerosol valves and airless systems each interact differently with a particulate system, and the interaction can only be assessed in the real container.

Cyclic temperature. Repeated warm-cool cycles simulate real transport and storage more closely than steady-state heat alone.

Protection verification

Measured SPF and UVA protection are established through third-party testing laboratories, in vitro and in vivo as the target market requires. We do not state protection values that have not been measured on the specific formula in question.

Where a brand has an existing claim they need to match, we formulate toward that target and treat the test result as the acceptance criterion. If the first formula misses, it is reworked rather than the claim being adjusted.

What is not claimed here

We publish no stability data on this site because we have no finished formula of our own to report on yet. This page describes the process we follow, not results we are representing as achieved.

When a formula is developed for a brand, its stability data belongs to that project and is shared with that partner — not used as a general marketing claim by us.