UV RESISTANCE / PROTECTION UPF- Ultraviolet protection factor rating. Ultraviolet Protection (UPF) 15 – 50+ Test Methods – AATCC AATCC Transmittance or Blocking of Erythemally Weighted Ultraviolet Radiation through Fabrics. standard by American Association of Textile. work, e.g. AATCC with ASTM D and. ASTM D in the United States and EN in. Europe. The Australian Radiation Protection and.
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However, because the fluorescent component does not contribute to the UPF, the spectral distribution of the source is irrelevant, so long as it provides sufficient energy to cover the spectral range of interest to acceptable signal to noise ratios in the spectral data. Purpose and Scope 1. All OSHA standards and rules must also be consulted and followed. However, the techniques for stretching the specimens are not part of this method and are addressed in a separate test procedure.
AATCC Launches New Tools for Testing UV-Protective Fabrics
Appendix A Spectrophotometer or Spectroradiometer Specifications Although integration is indicated from nm to the stated wavelengths, little or no contribution will occur in the nm region. Until such xatcc information is available, users of the method should use standard statistical techniques in making any comparison of test results for betweenlaboratory averages.
As a means of estimating this property, the method has no known bias.
Calibrate the wavelength scale atcc the spectrophotometer or spectroradiometer using the spectral emission lines of an electrical discharge in mercury vapor. Record the individual measurements.
UV Resistance / Protection Test: AATCC 183 , ASTM D655, ASTM D6603
Between-laboratory precision has not been established for this test method. In Marchan ul- A1. The contribution of sample fluorescence on spectral transmittance measurements on certain dyes and whitening agents present in fabrics that may fluoresce could result in artificially high values of spectral transmittance.
In this geometry the specimen is illuminated by an internally illuminated integrating sphere. Apparatus and Materials 8.
The intervals in Table II are in 2 nm. Filter, Schott Glass UG11 see Illumination and viewing geometries.
The use of an illuminating light source that conforms to the spectral distribution requirements for solar simulators will most accurately include the contribution of atacc fluorescence to the long wavelength UVA measurement. It must be noted that stretching the specimens could change the UPF properties.
Prepare only one specimen at a time. In spectrophotometers and spectroradiometers where the illumination is polychromatic and the monochromator follows the specimen in the optical path, the artificially high values of transmittance appear at the emission wavelengths of the fluorescing agent.
If the fabric has low moisture absorption, repeat the soaking and wringing steps. Precision and Bias The limits of the spectral range of ultraviolet radiation are not well defined and may vary according to the user. Wear prescribed safety glasses in all laboratory areas. Transmittance or blocking of erythemally weighted ultraviolet radiation through fabrics can be defined only in terms of a test method. Instrument Verification and Calibration 5. Press and move the specimen from time to time to ensure a good and uniform penetration.
The error can be eliminated in either geometry by use of a separate reference beam that traverses its own port opening in the sphere. A Schott Glass UG11 filter has been found to be satisfactory.
UV STANDARD | Determination of the UV Protection Factor UPF
The integrating sphere surface is internally coated or constructed using a material that is both diffuse and highly reflecting in the ultraviolet region. There is no independent method for determining the true value. The reference beam impinges on either a portion of the sphere wall or a reference material mounted at a diametrically opposed port opening. This includes nearly all wavelengths in the UVR spectral region.
The contribution of stray radiation within the instrument, including aacc due to sample fluorescence, shall produce an error of less than 0.