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Fri Dec 24, 2010 8:54 pm  |
| What does ppd stand for? |
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Wed Dec 29, 2010 4:37 am |
bump....
i dont know the percents  |
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Wed Dec 29, 2010 6:14 am |
If it has an SPF of 50 it should be absolutely fine - why do you need to know the PPD?
Another completely clear sunscreen that allot of people like is the Devita Natural Skin Care Body Block 30. |
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Born 1950. There's a new cream on the market that gets rid of wrinkles - you smear it on the mirror!! |
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Wed Dec 29, 2010 8:20 am |
| I think the PPD measures the UVA rays which are the ones that cause the most aging to the skin and the SPF measures more the UVB rays which cause burning. ( it may be the other way around) Makeup Alley website skin care board talks a lot about the PPD and there are some very knowledgeable posters like Haruka. My impression is that the highest PPD sunscreens are the ones from many Asian countries and Europe as they contain the most UVA blocking ingredients. And we should all be mindful of the PPD ratings especially when using certain skin care actives like lightening products. HTH Harriet |
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Wed Dec 29, 2010 10:45 am |
http://sun1.awardspace.com/Sunscreens/Standards/Standards.htm
Persistant Pigment Darkening (PPD, UVA-PF)
The Persistent Pigment Darkening (PPD) method is a method of measuring UVA protection, similar to the SPF method of measuring UVB light protection. Theoretically, a sunscreen with a PPD rating of 10 should allow you to endure 10 times as much UVA as you would without protection. People are irradiated with a UV-A light source (320 to 400 nm). Two or three hours after irradiation with UVA, the skin has changed yielding a persistent pigment darkening. The advantage of the persistent pigment darkening is that the residual colour that has developed after exposure to the radiation allows a more precise reading to be taken. They compare the sunscreen protected (MPDp) skin and the unprotected (MPDu) skin to determine the results. The results were expressed as UVA-protection factors UVA-PF. [Tinosorb] [Nora80] [Ciba]
The PPD response is stable and reproducible; however its clinical significance is questionable, because the action spectrum for PPD is not defined for wavelengths shorter than 320 nm, and the response is masked during outdoor sun exposure by other skin responses to UV. Thus it is impossible to relate the PPD protection factor directly to the degree of protection is sunlight. [Stanfield] |
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Wed Dec 29, 2010 3:24 pm |
| Keliu wrote: |
If it has an SPF of 50 it should be absolutely fine - why do you need to know the PPD?
Another completely clear sunscreen that allot of people like is the Devita Natural Skin Care Body Block 30. |
i want to know the PPD as im using skin lightening products
i have seen some SPF with 50 but a PPD of 5 
Thanks for the sunscreen recommendation |
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Wed Dec 29, 2010 4:59 pm |
| londongirl wrote: |
i want to know the PPD as im using skin lightening products
i have seen some SPF with 50 but a PPD of 5
Thanks for the sunscreen recommendation |
I thought that different countries just use different scales - but you ended up with the same result. But I admit to being very confused by all of this.
All I know is that Australia is the skin cancer capital of the world. Therefore, we are the most sunscreen conscious society in the world - we get it drilled into us constantly. Australia uses the SPF model and I would be surprised if it wasn't accurate and safe. |
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Born 1950. There's a new cream on the market that gets rid of wrinkles - you smear it on the mirror!! |
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Sat Jan 01, 2011 1:15 pm |
Thanks for bringing this up LondonGirl. I've got dark skin and the same requirements as you, so I may try your sunscreen as well as the Devita.
And I'll be adding PPD to my evergrowing list of ss concerns. urgh. |
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Olive, normal/oily skin. Using rinse-off ocm, Vit C, Tretinoin since Nov/10, GHK since Feb/12, Niacinamide & glucosamine, alternating, & now skipping nights! Concerns include oiliness, hyperpigmentation from occasional zits, 11's & nasolabial folds. |
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Sat Jan 01, 2011 11:12 pm |
Devita is by far the clearest high zinc oxide sunscreen I've ever tried. No other physical sunscreen even comes close in that respect.
You could also consider mixing your sunscreen with a foundation darker than your skin tone. |
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24 yrs old. favorite sunscreen right now: Burnout [now 35] |
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Sun Jan 02, 2011 8:32 am |
On the first post there is a chart showing the UVA/UVB protection of various sunscreen ingredients. Both SPF and PPD can cover both, for physical sunscreens the greatest protection comes with a combination of ZO and TD.
http://www.essentialdayspa.com/forum/viewtopic.php?tid=37359&start=0 |
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I'LL SEE YOU ON THE DARKSIDE OF THE MOON.... |
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