What's the difference between umbrella ultraviolet and UPF?

1. Umbrella UV: refers to the UV shielding rate.

1, ultraviolet shielding rate

Ultraviolet light is a group of light with high frequency and short wavelength, which can be divided into short-wave ultraviolet (UVC), medium-wave ultraviolet (UVB) and long-wave ultraviolet (UVA).

2. Description of UV treatment of umbrella cloth:

PS 1。 If the umbrella cloth is made and treated with ultraviolet rays (dipped in special drugs), the shielding rate can be increased from 50% to 90%.

PS2。 One kind of yarn is treated with ultraviolet rays (soaked in special chemicals) before weaving, and then woven as umbrella cloth. This kind of ultraviolet shielding rate will be higher, which belongs to permanent ultraviolet function and will not be reduced due to washing and sun exposure. The umbrella back prefers this kind of umbrella cloth.

PS3。 It is said that the umbrella cloth treated with silver glue is an anti-ultraviolet umbrella. In fact, it is better than plain cloth without silver glue in the experiment, which can be increased from 50% to 60~70% (the better the effect of dark cloth), but it is far from 90% which is really treated with UV, so we should pay attention to it. Don't be deceived by the merchants. Many businesses have lied about the ultraviolet protection of umbrella cloth.

2. Umbrella UPF knowledge

UPF:UPF ultraviolet protection factor. The method of measuring UPF is very complicated and can be divided into in vitro and in vivo.

Second, UPF anti-ultraviolet index

1, consumers are probably familiar with SPF (also known as sun protection factor), but most people don't know UPF, which is the anti-ultraviolet index of textiles. According to the report of the Institute of Textile Technology of the University of South Wales, Australia, the limit time for white people to produce erythema in the sun is about ten minutes. Wearing UPF20 clothes, the time to produce erythema can be extended to 20 times, reaching 200 minutes (more than three hours). Similarly, if you take an umbrella with UPF30, the time of skin erythema can be extended by 30 times to 300 minutes (five hours).

Generally speaking, the whiter the skin, the less resistant to the sun. Generally speaking, under the same sunshine, white people are the most popular, followed by yellow people, and finally black people. Basically, textiles themselves have the function of shielding ultraviolet rays. The thicker the clothes, the better the shielding effect against ultraviolet rays.

Extended data

1, if the measured value of UPF is: 40

2. If the measured value of UPF is greater than 50 and the transmittance of UVA is less than 5%, it is marked as UPF50+

3. After long-term use and under the condition of stretching or humidity, the protective performance provided by this product may be reduced.