AATCC 183 Transmittance or Blocking of UV Radiation through Fabric

Purpose of Test

This test evaluates the ultraviolet radiation (UV-R)  blocked by textile fabrics treated with UV protection. This test simulates the UV-R on various fabrics to make sure they are properly rated for UV protection.

It provides a general procedure for determining UV protection property in textiles in these conditions:

  • Wet
  • Dry

Terminology Defined

UV Radiation (UV-R) – Type of energy produced by the sun or artificial light sources that can pass through fabrics.

UV Protection – The textile fabric’s protection against the sun’s UV radiation or other sources.

UVA – Ultraviolet A has a significantly longer wavelength and is associated with premature skin aging.

UVB – Ultraviolet A has a shorter wavelength and is associated with skin burning.

Spectrophotometer – An instrument used for measuring the wavelength of light transmission.

Spectrophotometer (Image Source: Unico)

Spectroradiometer – A light measurement tool that can determine both amplitude and wavelength of light transmission from a given source.

Spectroradiometers (Image Source: Apogee Instruments)

Test Method

Materials Used for Test

  • Test specimen
  • Spectrophotometer
  • Spectroradiometer

Testing Procedure

The test specimen’s UV protection property is tested by using a spectrophotometer or spectroradiometer at given wavelength intervals. Through the use of mathematical calculations, the UVA and UVB blocking percentages are determined.

Test Procedure (Summary)

Part 1: Measurement of UV-R transmission: The test specimen is laid on a spectrophotometer or spectroradiometer at certain wavelength intervals.

Part 2: Calculation of UV blocking: Using certain formulas in the general procedure, the blocking percentages of UVA and UVB are calculated.

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