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SPF

The Sun Protection Factor (SPF) is a vital measure for assessing the effectiveness of sun care products against erythemal UV rays. Understanding the importance of SPF is crucial for choosing a product suitable for your skin and your sun exposure.

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Facteur de protection contre UVA (PF-UVA).

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FAQ about spf

Is an SPF 30 sufficient for daily protection?
In winter, an SPF 30 is generally sufficient for daily protection, except in cases of prolonged exposure. In summer, it is preferable to switch to an SPF 50. This also depends on the UV index. If the UV index is 1 and the exposure only lasts for an hour, an SPF 30 is more than enough.
SPF 30 versus SPF 50: What's the difference?
The SPF 50 provides slightly superior protection compared to SPF 30, blocking about 98% of erythemal UV rays versus 97% for SPF 30.
Should we reapply a sunscreen with a high SPF?
Yes, in the event of prolonged exposure, it is recommended to reapply your sunscreen every two hours, even if it has an SPF of 50 or higher.
Does SPF protect against UVA?
The SPF measures the filtering rate of erythemal UV rays of a sunscreen, which are composed of 85% UVB and 15% UVA.
Is makeup with SPF as effective as sunscreen?
If the product is applied in sufficient quantity, it will be equally effective. However, this is rarely the case as it can lead to a pasty and unnatural result.
What is the difference between FPS and SPF?
There is no difference between FPS and SPF. FPS is the French term "Facteur de Protection Solaire" and SPF is the English term "Sunburn Protection Factor".
Are clothing with SPF effective?
Yes, clothing with an SPF rating can provide additional protection, especially for exposed areas.
Does layering multiple SPFs increase sun protection?
No, the SPFs cannot be added together. However, it can be beneficial to combine skincare products with sunscreens, as a certain amount is required to achieve the protection factor value indicated on the label.
After several days of exposure, is it possible to reduce the SPF applied?
According to some studies, applying sunscreen for several consecutive days prior to UV ray exposure can provide a basic level of skin protection. This might suggest that it's possible to use a product with an SPF 30 after having applied an SPF 50 for several days. However, research on this topic is currently insufficient and, as a precautionary principle, it is recommended to continue using a high SPF throughout the exposure period.