Sunscreen/sunblock definition

[Guest guest]

Q: What's the difference between a " chemical sunscreen " and a

" physical sunblock " ?

A: There are currently two types of UV protection on the market:

chemical sunscreens and physical sunblocks. Both can protect against

UVA (Aging) and UVB (Burning) rays, but do so differently: sunscreens

containing chemical ingredients absorb UV rays, while those

containing ingredients such as Titanium Dioxide and Zinc Oxide block

out UV rays physically by deflecting the rays away from the skin. The

benefits of physical sunblocks are that they are effective

immediately following application (as opposed to waiting 15-30

minutes with chemical sunscreens), and are ideal for individuals with

sensitive skin or for people who may react to chemical sunscreens.

[Guest guest]

It is my understanding that not only do chemical and physical sunscreens

protect differently, but physical sunscreens (those containing zinc oxide or

titanium dioxide) and one type of chemical (avobenzone AKA Parsol 1789 or so)

provide superior protection against UVA.

This point is strongly emphasized by a Begoun in her books and website.

If you'd like more info her website is www.cosmeticscop.com and she discusses

this issue in " Skin " section.

Margaret C.