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 average UPF was The intervals in Table I are in 2 nm. Precision and Bias The cross-sectional area of the illuminating beam shall be at least 10 times the dimension of the largest hole in the test material.
Press and move the specimen from time to time aaatcc ensure a good and uniform penetration. Illumination and viewing geometries. The limits of the spectral range of ultraviolet radiation are not well defined and may vary according to the user. Calibrate the wavelength scale of the spectrophotometer or spectroradiometer using the spectral emission lines of an electrical discharge in mercury vapor.
UV STANDARD | Measuring methods
The precautions are ancillary to the testing procedures and are not intended to be all inclusive. Calibrate the spectrophotometer or spectroradiometer according to manufacturer instructions. The intervals in Table II are in 2 nm.
The use of aafcc 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. A Schott Glass UG11 filter has been found to be satisfactory.
Appendix A Spectrophotometer or Spectroradiometer Specifications 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.
Between-laboratory precision has not been established for this test method. All OSHA standards and rules must also be consulted and followed.
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 reference beam impinges on either a portion of the sphere wall or aaycc reference material mounted at a diametrically opposed port opening. 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.
Wear prescribed safety glasses in all laboratory areas. The total flux transmitted by the specimen is collected by the integrating sphere.
Although integration is indicated from nm to the stated wavelengths, little or no contribution will occur in the nm region. In this geometry the specimen is illuminated with an unidirectional beam whose axis is not greater than aatcx. Uses and Limitations 3. 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.
It must be noted that stretching the specimens could change the UPF properties. Prepare only one specimen at a time. Thoroughly wet out atacc 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 integrating sphere surface is internally coated or constructed using a material that is both diffuse and highly reflecting in the ultraviolet region. Avoid evaporative reduction of the moisture content below the specified level before the actual UV transmission measurements are made.
This includes nearly all wavelengths in the UVR spectral region. The aatcv or spectroradiometer shall have a spectral bandpass of 5 nm or less over the spectral range of nm or less to nm or more. However, the techniques for stretching the specimens are not part of this method and are addressed in a separate test procedure. The effects of fluorescence are, therefore, eliminated at most UVR wavelengths. Principle ance transmitted and calculated through air to the average effective UV-R irradiance transmitted and calculated through fabric.
Filter, Schott Glass UG11 aaatcc The wavelength calibration of a spectrophotometer can be performed using the absorption spectra of a holmium oxide glass filter. The specimen is viewed unidirectionally with an axis not greater than 0. Transmittance or blocking of erythemally weighted ultraviolet aatccc through fabrics can be defined only in terms of a test method. The use of physical standards are recommended for validating the measurement of spectral transmittance.
UV Resistance / Protection Test: AATCC 183 , ASTM D655, ASTM D6603
Zatcc Marchan ul- A1. Avoid distorting the specimen during preparation aatfc handling. There is no independent method for determining the true value. Note, some samples may not be capable of achieving the specified wet pick-up such as tightly woven synthetic fabrics. The error due to the fluorescence can be removed by placing a UV transmitting, visible blocking filter after the sample. The cross-sectional area of the viewing beam shall be at least 10 times the dimension of the largest hole in the test material.
The contribution of stray radiation within the instrument, including that due to sample fluorescence, shall produce an error of less than 0. The measured wavelength interval over this spectral range should not be greater than 5 nm. As a means of estimating this property, the method has no known bias. If the fabric has low moisture absorption, repeat the soaking and wringing steps.
In this geometry the specimen is illuminated by an internally illuminated 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.
Instrument Verification and Calibration 5. Allow the specimen to remain submerged for 30 minutes.