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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The error can be eliminated in either geometry by use of aztcc separate reference beam that traverses its own port opening in the sphere. The wavelength calibration of a spectrophotometer can be performed using the absorption spectra of a holmium oxide glass filter.
Calibrate the wavelength scale of the spectrophotometer or spectroradiometer using the spectral emission lines of an electrical discharge in mercury vapor.
These safety precautions are for information purposes only. Thoroughly wet out the specimen in distilled water by placing it flat in the bottom of a beaker and then pour distilled water into the beaker until the specimen is covered.
The error due to the fluorescence can be removed by placing a UV transmitting, visible blocking filter after the sample. In Marchan ul- A1. All OSHA standards and rules must also be consulted and followed.
American standards for UV-protective textiles.
The effects of fluorescence are, therefore, eliminated at most UVR wavelengths. Between-laboratory precision has not been established for this test method. This includes 1833 all wavelengths in the UVR spectral region. The cross-sectional area of the illuminating beam shall be at least 10 times the dimension of the largest hole in the test material.
UV STANDARD | Measuring methods
If the fabric has low moisture absorption, repeat the soaking and wringing steps. The intervals in Table II are in 2 nm. The contribution of stray radiation within the instrument, including that due to sample fluorescence, shall produce an error of less than 0. The use of an aaatcc light source that conforms to the spectral axtcc requirements for solar simulators will most accurately include the contribution of sample fluorescence to the long wavelength UVA measurement.
The total flux transmitted by the specimen is collected by the integrating sphere. The cross-sectional area of the viewing beam shall be at least 10 times the dimension of the largest hole in the test material.
In this geometry the specimen is illuminated with an unidirectional beam whose axis is not greater than 0. Appendix A Spectrophotometer or Spectroradiometer Specifications Uses and Limitations 3. The average UPF was Avoid distorting the specimen during preparation and handling.
UV Resistance / Protection Test: AATCC 183 , ASTM D655, ASTM D6603
Validate the linearity of the transmittance scale by means of either calibrated neutral density filters or calibrated perforated screens supplied by the instrument manufacturer or standardizing laboratories. Purpose and Scope 1. In spectrophotometers and spectroradiometers where the 138 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.
Illumination and viewing geometries. There is no independent method for determining the true value. The use of physical standards are recommended for validating the measurement of spectral transmittance. Apparatus and Materials 8. Avoid evaporative reduction of the moisture content below the specified level before the actual UV transmission measurements are made. Precision and Bias As a means of estimating this property, the method has no known bias. However, the decrease in transmission of the filter with increasing wavelength may reduce the usefulness of the long wavelength UVA measurement.
Determination of the UV Protection Factor UPF
Filter, Schott Glass UG11 see Calibrate the spectrophotometer or spectroradiometer according to manufacturer instructions. The specimen is viewed unidirectionally with an axis not greater than 0. The precautions are ancillary to the testing procedures and are not intended to be all inclusive.
Wear prescribed safety glasses in all laboratory aactc. Allow the specimen to remain submerged for 30 minutes. It must be noted that stretching the specimens could change the UPF properties. Until such precision information is available, users of the method should use standard statistical techniques in making any comparison of test results for betweenlaboratory averages.