𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 : 𝐔𝐕 𝐀𝐛𝐬𝐨𝐫𝐛𝐞𝐫𝐬: 𝐇𝐨𝐰 𝐂𝐚𝐧 𝐖𝐞 𝐕𝐞𝐫𝐢𝐟𝐲 𝐓𝐡𝐞𝐢𝐫 𝐄𝐟𝐟𝐞𝐜𝐭𝐢𝐯𝐞𝐧𝐞𝐬𝐬?

𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞

𝐔𝐕 𝐀𝐛𝐬𝐨𝐫𝐛𝐞𝐫𝐬: 𝐇𝐨𝐰 𝐂𝐚𝐧 𝐖𝐞 𝐕𝐞𝐫𝐢𝐟𝐲 𝐓𝐡𝐞𝐢𝐫 𝐄𝐟𝐟𝐞𝐜𝐭𝐢𝐯𝐞𝐧𝐞𝐬𝐬?

UV absorbers are important additives used to protect polymers from degradation caused by ultraviolet radiation.

Their effectiveness can be evaluated in different ways, for example:

Accelerated weathering test

Using equipment such as a Weather-Ometer, which simulates sunlight, heat, humidity, and rain exposure.

UV-Vis spectrophotometry

Measuring the transmittance of the material across different wavelength ranges, from the UV region to the visible light region.

For a material containing an effective UV absorber, the expected result is a strong reduction in transmittance in the UV region (A,B or C), typically between 200 and 400 nm.

Ideally, UV transmittance should be close to zero, or at least significantly reduced compared to a sample without UV protection.

In the case of flexible transparent films, transmittance is expected to increase after the UV region, near the transition to the visible light range. This allows visible light to pass through the film while blocking or reducing harmful UV radiation.

IN SIMPLE TERMS:

A good UV absorber should block harmful UV light while preserving the desired level of visible transparency.

source : Polimerizze Technology

#Polymers #PlasticAdditives #UVAAbsorbers #UVStabilization #PlasticFilms #WeatheringTest #Spectrophotometry