sun cream
The sun protection factor
(SPF) of a sun cream is determined after
phototesting products at an internationally agreed
application thickness of 2 mg per cm2.
sun cream
However, studies have shown that users apply much
less than this - typically between 0.5 and 1.5
mg per cm2. This has an appreciable effect on
what protection the sun cream gives, with
typical application rates achieving a sun protection
factor of perhaps one third of that stated on
the product. This mismatch may be one contributing
factor why sunscreens have been reported to be
a risk factor in melanoma.
sun cream
No international standard on sunscreens specifies
dosage criteria for users, although it is assumed
to be 2 mg/cm. So it is not surprising that users
do not know how to apply sun cream effectively.
tan accelerator
How
to Apply Sun Cream more Effectively for Protection
tan accelerator
We suggest here a method
that would allow users to apply a quantity of
sun cream that would result in closer agreement
between the expected and delivered protection.
tan accelerator
•
The
"rule of nines" is used to assess
the extent of a patient's burns as a percentage
of the patient's body surface area.
•
The
"fingertip unit" is used to measure
the amount of cream or ointment to be used
in dermatology: it is a strip of product
squeezed on to the index finger, from the
distal crease to the fingertip.
