The International Organization for Standardization (ISO) has recently greenlighted two groundbreaking techniques designed to measure the Sun Protection Factor (SPF) of sunscreen products.
This announcement follows extensive research and aims to improve the accuracy and efficiency of SPF evaluations while promoting ethical practices and cutting costs.
Innovative In Vitro Testing Method
The first method, known as ISO 23675 or the “double plate” standard, marks a pivotal moment as it becomes the first fully in vitro test for SPF approved by ISO.
Unlike conventional testing protocols that require human volunteers, this entirely lab-based approach eliminates the need for human involvement altogether.
It applies specifically to sunscreen formulations such as emulsions and one-phase alcoholic solutions.
However, it’s important to note that this technique does not cover loose or compressed powders or stick products, nor does it evaluate the water resistance of sunscreens.
Experts view this development as a significant leap forward, providing quicker and more accurate assessments that align with regulatory recommendations for sun protection solutions.
A Combined Testing Strategy
The second method, ISO 23698, takes a different route by employing a hybrid approach that merges both in vitro and in vivo strategies.
Dubbed Hybrid Diffuse Reflectance Spectrology (HDRS), this method allows for a detailed analysis of a sunscreen’s effectiveness based on its absolute spectral absorbance when applied to the skin.
This innovative technique enables manufacturers to estimate the level of sunburn protection and ultraviolet A (UVA) defense offered by their products.
With this hybrid strategy, the SPF rating, UVA Protection Factor (UVA-PF), and critical wavelength (CW) of a sunscreen can be accurately identified without relying on biological responses.
It is particularly useful for formulations designed to absorb, reflect, or scatter ultraviolet radiation, mainly targeting emulsions and single-phase liquids.
However, it hasn’t yet been assessed for powder-based products.
Conclusion
In conclusion, the approval of these two novel testing methods by ISO represents a meaningful advancement in SPF evaluation.
They offer more reliable, ethical, and cost-effective solutions for assessing sun protection products, paving the way for advancements in the field of sun safety.
Source: Premiumbeautynews