VIT 131 – UV Penetration & Protection Test System

Testing Method

Standard for UV Penetration & Protection Test of Textiles
Due to varying geographical locations and regulations, there is no unified global standard for UV detection in textiles. The key standards used for testing UV penetration in textiles include the EU’s PREN13758, Australia’s AS/NZS4399, the US’s AATCC 183, the UK’s BS7914, and China’s GB/T18830. During testing, UV light with wavelengths ranging from 280nm to 400nm is passed through the fabric. The system collects spectral rays and calculates the total spectral projection ratio, allowing for the determination of UV transmittance or the UPF (Ultraviolet Protection Factor) value of the fabric.

Interpretation of Specialized Terminology

• UPF (Ultraviolet Protection Factor): UPF refers to the ratio of the average ultraviolet radiation received by the skin when unprotected versus when protected by fabric. A higher UPF value indicates better UV protection. A fabric is considered UV-protective if the UPF value is greater than 40, with UVA transmittance under 5%. Fabrics with a UPF value above 50 offer negligible UV impact on the human body.
• UV Radiation: Ultraviolet radiation, with wavelengths from 200nm to 400nm, is classified into UVA and UVB:
  • UVA (320nm – 400nm): Penetrates deep into the skin, causing tanning, skin damage, and the breakdown of collagen, leading to wrinkles and sagging.
  • UVB (280nm – 320nm): Has a lower radiation level than UVA but causes skin erythema, freckles, and long-term damage such as skin aging and cancer with prolonged exposure.

UV Penetration & Protection Test System
The UV penetration & protection tester, also referred to as a fabric sunscreen index tester or anti-ultraviolet transmittance tester, evaluates a fabric’s UV protection capacity by determining its UPF value. This system supports PC control and automation, making it an ideal solution for testing the sunscreen properties of textiles.