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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This includes nearly all wavelengths in the UVR spectral region. Appendix A Spectrophotometer or Spectroradiometer Specifications aatcd Record the individual measurements. Calibrate the spectrophotometer or spectroradiometer according to manufacturer instructions.
American standards for UV-protective textiles.
Transmittance or blocking of erythemally weighted ultraviolet radiation through fabrics can be defined only in terms of a test method. Allow the specimen to remain submerged for 30 minutes. Any ray of this beam shall not exceed 0. The error can be eliminated in either geometry by use of a separate reference beam that traverses its own port opening in the sphere.
The cross-sectional area of the illuminating beam shall be at least 10 times the dimension of the largest hole in the test material. 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. The specimen is viewed unidirectionally with an axis not greater than 0.
The total flux transmitted by the specimen is collected by the integrating sphere. 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.
In Marchan ul- A1. The cross-sectional area of the viewing beam shall be at least 10 times the dimension of the largest hole in the test material.
Filter, Schott Glass UG11 see The contribution of stray radiation within the instrument, including that due to sample fluorescence, shall produce an error of less than 0.
Press and move the specimen from time to time to ensure a good and uniform penetration. The error due to the fluorescence can be removed by placing a UV transmitting, visible aaycc filter after the sample. Precision and Bias Uses and Limitations 3.
Illumination and viewing geometries. In aatc geometry the specimen is illuminated by an internally illuminated integrating sphere. Avoid evaporative reduction of the moisture content below the specified level before the actual UV transmission measurements are made. The measured wavelength interval over this spectral range should not be greater than 5 nm.
The precautions are ancillary to the testing procedures and are not intended to be all inclusive.
AATCC Launches New Tools for Testing UV-Protective Fabrics
The wavelength calibration of a spectrophotometer can be performed using the absorption spectra of a holmium oxide glass filter. All OSHA standards and rules must also be consulted and followed.
Apparatus and Materials 8. Calibrate the wavelength scale of the spectrophotometer or spectroradiometer using the spectral emission lines of an electrical discharge in mercury vapor. A Schott Glass UG11 filter has been found to be satisfactory. 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 spectrophotometer or spectroradiometer shall have a spectral bandpass of 5 nm or less over the spectral range of nm or less to nm or more. Prepare only one specimen at a time. As a means of estimating this property, the method has no known bias. The intervals in Table I are in 2 nm. The use of physical standards are recommended for validating the measurement of spectral transmittance. 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.
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.
UV STANDARD | Measuring methods
Instrument Verification and Calibration 5. However, the techniques for stretching the specimens are not part of this method and are addressed in a separate test procedure. However, the decrease in transmission of the filter with increasing wavelength may reduce the usefulness of the long wavelength UVA measurement. In this geometry the specimen is illuminated with an unidirectional beam whose axis is not greater than 0.
The use of an illuminating light source that conforms to the spectral distribution requirements for solar simulators will most accurately include the contribution of sample fluorescence to the long wavelength UVA measurement. The average UPF was Purpose and Scope 1.
Wear prescribed safety glasses in all laboratory areas. Between-laboratory precision has not been established for this test method. The intervals in Table II aatcd in 2 nm. These safety precautions are for information purposes only. Principle ance transmitted and calculated through air to the average effective UV-R irradiance transmitted and calculated through fabric. It must be noted that stretching the specimens could change the UPF properties.