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 cross-sectional area of the illuminating beam shall be at least 10 times the dimension of the largest hole in the test material.
It must be noted that stretching the specimens could change the UPF properties. Calibrate the spectrophotometer or spectroradiometer according to manufacturer instructions. Prepare only one specimen at a time. Avoid evaporative reduction of the moisture content below the specified level before the actual UV transmission measurements are made.
There is no independent method for determining the true value. Uses and Limitations 3.
Appendix A Spectrophotometer or Spectroradiometer Specifications Filter, Schott Glass UG11 see The contribution of sample fluorescence on spectral transmittance measurements on certain dyes and whitening agents present in fabrics that may atcc could result in artificially high values of spectral transmittance. Apparatus and Materials 8. The effects of fluorescence aatcd, therefore, eliminated at most UVR wavelengths.
Illumination and viewing geometries. Between-laboratory precision has not been established for this test method. The error due to the fluorescence can be removed by placing a UV transmitting, visible blocking filter after the sample. The average UPF was Record the individual measurements. Avoid distorting the specimen during preparation and handling. Wear prescribed safety glasses in all laboratory areas.
AATCC Launches New Tools for Testing UV-Protective Fabrics – Consumer and Retail Services
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. The reference beam impinges on either a portion of the sphere wall or a reference material mounted at a diametrically opposed port opening. The contribution of stray radiation within the instrument, including that due to sample fluorescence, shall produce an error of less than 0.
Allow the specimen to remain submerged for 30 minutes. 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.
All OSHA standards and rules must also be consulted and followed. The specimen is viewed unidirectionally with an axis not greater than 0. Note, some samples may not be capable of achieving the specified wet pick-up such as tightly woven synthetic fabrics.
Aatccc such precision information is available, users of the method should use standard statistical techniques in making any comparison of test results for betweenlaboratory averages. Any ray of this beam shall not exceed 0.
The integrating sphere surface is internally coated or constructed using a material that is both diffuse and highly reflecting in the ultraviolet region. aatccc
UV STANDARD | Measuring methods
The measured wavelength interval over this spectral range should not be greater than 5 nm. Purpose and Scope 1. As a means of estimating this property, the method has no known bias. In this geometry the specimen is illuminated aagcc an unidirectional beam whose axis is not greater than 0. Instrument Verification and Calibration 5.
Transmittance or blocking of erythemally weighted ultraviolet radiation through fabrics can be defined only in terms of a test method. However, the decrease in transmission of the filter with increasing wavelength may reduce the usefulness of the long wavelength UVA measurement. The cross-sectional area of the viewing beam shall be at least 10 times the dimension of the largest aatfc in the axtcc material. The total flux transmitted by the specimen is collected by the integrating sphere.
These safety precautions are for information purposes only.
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. However, the techniques for stretching the specimens are not part of this method and are addressed in a separate test procedure.
In Marchan ul- A1. Precision and Bias 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 intervals in Table I are in 2 nm.
Press and move the specimen from time to time to ensure a good and uniform penetration. Although integration is indicated from nm to the stated wavelengths, little or no contribution will occur in the nm region.
Principle ance transmitted and calculated through air to the average effective UV-R irradiance transmitted and calculated through fabric.
The wavelength calibration of a spectrophotometer can be performed using the absorption spectra of a holmium oxide glass filter. 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 intervals in Table II are in 2 nm. The precautions are ancillary to atcc testing procedures and are not intended to be all inclusive. In this geometry the specimen is illuminated by an internally illuminated integrating sphere.