We apply sunscreen to protect ourselves against the harmful ultraviolet rays of the sun.
A cream can contain a mineral or a chemical sun filter, or both. You get a mineral sunscreen if you add white dyes such as zinc oxide or titanium oxide to the cream.
These substances act as a filter because they reflect the UV radiation back to the environment. With creams with a mineral sunscreen, a white haze often remains on the skin for a while after rubbing.
UVA radiation causes leathery skin
This is often not the case with creams with a chemical filter; they contain organic molecules such as benzophenone, camphor compounds, cinnamates and salicylates.
These substances absorb the UV rays and convert them into infrared radiation, that is, heat that is released into the air or carried away through the bloodstream.
Almost all sunscreen creams protect against both UVA and UVB radiation. The UVA radiation influences the resilience of the skin and causes wrinkles and leathery skin.
The UVB radiation causes sunburn, which we all know of sitting in the sun for too long without applying ourselves. Both types of radiation can also lead to skin cancer, and although UVB radiation is considered more harmful than UVA radiation, there is no 'safe' ultraviolet radiation.
The amount is decisive
The factor indication that is on sunscreen refers exclusively to the protection that the cream offers against UVB radiation, ie against sunburn.
That many people still burn despite the use of a sunscreen with a high factor, is because they do not apply enough cream.
You need a whole hand full (about 40 grams for an adult), not just a lump here and there. Furthermore, a water-resistant cream is best, because it also offers protection if you often take a dip and perspire a lot.