SPF & PA+ Guide: Here provides definition of SPF & PA, brands recommendations of physical sunscreen and chemical sunscreen.Take smooth e as eg, it is divided by Smooth-E physical sunscreen SPF 52 & 72, Smooth-E physical sunscreen SPF 52 non chemical, Smooth-E physical white sunscreen SPF 52 PA++ & PA+++.

Tips for SPF & PA

Printed on package of sunscreen cream, SPF and PA+ are two main figures to observe capacity of sunscreen products. 
1. Full name of SPF is Sun Protection Factor, which refers to capacity against UVB that is the culprit of sunburn. SPF is time multiplier of sunscreen. For example, under summer sun, skin turns red after 15 min, but time prolong 15 multiplier after using sunscreen cream spf15. 
2. Misunderstandingly, the higher figure of SPF is, the better result of sunscreen is. It should be considered comprehensively according to individual skin, reaction of sunbathe, and condition of sweat. 
3. Duration effective sunscreen is presented by SPF. Duration unit of sunscreen is 20-25 min. As a result, sunscreen duration of SPF30 is (20-25 min)*30=600-750min. The higher SPF is, the longer sunscreen time is, the heavier burden of skin is.
4. PA, Protection of UVA-1, refers to capacity of being against UVA, resulting in photoaging and tanning. Marked as +, ++, +++, three kinds of strength, the more + is presented, the better result being against UVA. PA+ shows 2 times-4 times extension of tanning time, PA++ 4-8 times, PA+++ above 8 times.

Definition of Physical Sunscreen & Chemical Sunscreen

Physical sunscreen refers to sunscreen smearing against UV touch. However, chemical sunscreen refers to absorbing UV, with direct damage released  in a lower form of energy.
Physical sunscreen undermines burden of skin, strengthens capacity of sunscreen, being suitable for sensitive skin, but it takes the disadvantage of thick paste, and results in oily & white appearance.
Chemical sunscreen takes the advantage of light makeup, but it stimulates skin when resmearing sunscreen with the interval of 4 hrs.

Demand of Sunscreen

Work Or School: SPF 15-30, PA+ or PA++
Brand Recommend: HABA  is known as natural sunscreen definitely. It rejects UV absorber, preservative, essence, pigment. Sensivetive skin is available. It is better to use within 3 months.
the ginza is moisturizing without oily feeling, but it needs big budget.
Daily Life: SPF 30-50, PA++ or PA+++
Brand Recommend: THANN  is high-class brand of Thailand. After use, it feels like cream. It is anti-oxygen.
ELIXIR is cheap and divided by cool type and moisturing type. It is good for lighten and whiten.
Holiday or Travel: SPF 50, PA+++ or PA++++
Brand Recommend: Smooth-E    Natura Bisse Luminous Shield  POLA   Boots Salton
Take Smooth-E as eg, it is divided by Smooth-E physical sunscreen SPF 52 & 72, Smooth-E physical sunscreen SPF 52 non chemical, Smooth-E physical white sunscreen SPF 52 PA++ & PA+++. With a wide variety, it is so strongly recommended.
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