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Five points of knowledge about sunscreen

May 12, 2022
Table of Contents
Primary Item (H2)

1. Why should we use sunscreen?

What we protect against is ultraviolet rays, so what are ultraviolet rays? Ultraviolet rays in sunlight are newly divided into three types: long wave, medium wave, and short wave, which are the UVA, UVB, and UVC we are usually familiar with.

Guide to Sunscreens


UVA refers to long-wave ultraviolet rays with a 31-340nm wavelength. UVA can cause symptoms such as sunburn, redness and pain, and actinic keratosis (age spots).


UVB refers to long-wave ultraviolet rays with a 280-320nm wavelength. UVB can cause strong photodamage to the skin. The dermis of the irradiated area will expand. If exposed to UVB for a long time, the skin will experience redness, swelling, blisters, and other symptoms.


UVC refers to short-wave ultraviolet light with a 200-280nm wavelength. UVC is also very harmful to the human body. Short-term exposure can burn the skin. Long-term or high-temperature exposure can also cause skin cancer.

2. The dangers of not using sun protection

Spots: UV rays will accelerate the formation of spots and pigmentation.

Accelerated skin aging and fine lines and wrinkles: Only 10% of human aging is natural, and ultraviolet rays cause 90% of aging.

Skin allergies, enlarged pores, and deepened acne marks: Babies with sensitive skin, acne-prone skin, and enlarged pores should pay attention

After sunburn, the cost of whitening and repairing in the later stage is high: prevention is better than treatment. After getting sunburned, not only will you feel uncomfortable, but you will also spend a lot of time and money to repair it.

3. There are several types of sunscreen

Sunscreens & Broad Spectrum Sun Protection

A. Physical sunscreen

Using the principles of physics, the atomic particles of this sunscreen are in the form of sheets. When spread on the face, they act like a mirror, reflecting sunlight to achieve the purpose of sun protection. Titanium dioxide and zinc oxide are both physical sunscreen ingredients. They can form a protective film on the skin, making it impossible for ultraviolet rays to penetrate its surface. Both can provide comprehensive UVB protection, among which zinc oxide can block UVA better. Typical physical sunscreen ingredients are white and pasty and turn blue when exposed to water. However, this type of product also has certain limitations:

✔For people with darker skin, the polishing effect may not be natural.

✔For people with drier skin, it needs to be moisturizing more.

✔It is not suitable for full-body sunscreen.

✔Makeup remover products must be used to help Remove cleanly.

B. Chemical sunscreen

It uses chemical ingredients to protect it from the sun. This kind of sunscreen uses the absorption principle to protect from the sun. It is a light-transmitting substance that can absorb ultraviolet rays and convert them into molecular vibration energy or heat energy to achieve the effect of sun protection, such as para-aminobenzoic acid and Its derivatives, cinnamic acid, etc. When applied to the face, the atoms absorb sunlight to prevent it from reaching the skin. In theory, physical sunscreen is better than chemical sunscreen, but currently, most are chemical sunscreens.

4. The meaning of SPF

SPF30 means sun protection index 30 times, one time means sun protection time of 15 minutes, then 30 ×15=450 minutes, seven hours, which is everyday daytime sun protection.

PA+++ means 3+++ sunscreen, which means that the sunscreen can effectively resist ultraviolet rays indoors and outdoors.

5. How to choose sunscreen?

Sun Barrier Mineral Sunscreen Broad Spectrum SPF 50

① SPF suitable scene reference

✔Daily commuting, going to school, and shopping SPF30+, PA+++

✔Long-term high-intensity outdoor sports such as mountain climbing, learning to drive at the beach, military training SPF50+, PA++++

✔Do not apply sunscreen when diving. The chemicals in sunscreen greatly impact the ecological environment and organisms of the ocean. It is better to apply it on shore after diving.

② How to choose sunscreen of skin type

✔Oil skin: Choose sunscreen with an oil-free formula and intense penetration

✔Dry skin: Choose a sunscreen that is moisturizing and non-drying.

✔Acne-prone skin: Choose sunscreen with an oil-free formula and intense penetration. Disable sunscreen when acne is severe, or the skin is damaged. Use sun protection clothing, an umbrella, and other rugged sun protection.

✔Sensitive skin: Sunscreen for sensitive skin or a mild sunscreen with ingredients such as “passed allergy test” and “no fragrance, preservatives” written in the product description, or choose a physical sunscreen.


sunscreen with broad spectrum SPF protection

Sun protection is important to protect the skin from UV rays, which can cause various skin problems, including sunburn, skin aging, pigmentation, etc. Ultraviolet rays are divided into UVA, UVB, and UVC, and UVA and UVB are the two types that mainly cause skin damage. Sunscreen products are divided into two kinds: physical sunscreen and chemical sunscreen. Physical sunscreen reflects sunlight, while chemical sunscreen absorbs ultraviolet rays. SPF and PA values are essential criteria for evaluating the efficacy of sunscreen products. Choosing a sunscreen product that suits your skin type and usage scenario is crucial.

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