Sunscreen dosages : The ANALYTEC Why, When and How


This is a quite rare event so it is worth a mention, a new sunscreen has been included in Appendix VI of the cosmetics regulations:

So here is Phenylene Bis-Diphenyltriazine!

Whilst it is not yet in general use, this is a good time for us to shed some light on these agents which require close monitoring.





Proving the protective capacities of a sunscreen product with a claimed SPF (using a suitable testing procedure: Vitro, vivo or both) is clearly a major obligation for those putting it on the market.

In the majority of cases, this test is only done once during the lifetime of a product, and most often using a laboratory formulation. However this can be too fragile to guarantee a sufficient degree of safety.

The Responsible Person must verify that the protection factor remains sufficient to ensure the safety of its users at each and every stage of the product’s development and marketing.

But for this there is no need to repeat the SPF tests at each stage. Checking the specifications of organic or mineral sunscreens by dosage will provide the essential information to prove that the stated degree of sun protection is still present; thus demonstrating the effectiveness of the formulation in protecting the consumer against exposure to the sun.






Sunscreen dosage checks should be completed:

1) when stable under accelerated conditions,
2) on at least the first 3 production batches,
3) at regular intervals for the following batches.
4) during spot checks at points of sale and in product sample libraries (actual ageing)

They also provide better formulation data and therefore add to the PIF.






ANALYTEC has recently improved its organic sunscreen dosage testing method :

– 1 single 20 minute run
– dosage testing for 18 organic sunscreens
– For all dosage forms
– Completed weekly, or more often if necessary

So there’s no excuse for not being in total control of this safety issue: YOU CREATE, WE TEST!