sun tan lotion
The sun protection factor
(SPF) of a sun tan lotion is determined after
phototesting products at an internationally agreed
application thickness of 2 mg per cm2.
sun tan lotion
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 tan lotion 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 tan lotion
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 tan lotion effectively.
sun
tan lotion
How
to Apply Sun Cream more Effectively for Protection
sun tan lotion
We suggest here a method
that would allow users to apply a quantity of
sun tan lotion that would result in closer agreement
between the expected and delivered protection.
sun tan lotion
•
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.
