AATCC 183 PDF

Marn The integrating sphere surface is internally coated or constructed using a material that is both diffuse and highly reflecting in the ultraviolet region. 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. American standards for UV-protective textiles. The effects of fluorescence are, therefore, eliminated at most UVR wavelengths.

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Marn The integrating sphere surface is internally coated or constructed using a material that is both diffuse and highly reflecting in the ultraviolet region. 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. American standards for UV-protective textiles. The effects of fluorescence are, therefore, eliminated at most UVR wavelengths.

Press and move the specimen from time to time to ensure a good and uniform penetration. All OSHA standards and rules must also be consulted and followed. The intervals in Table I are in 2 nm. Prepare only one specimen at a time. This includes nearly 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. Wear prescribed safety glasses in all laboratory areas. 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.

Record the individual measurements. The limits of the spectral range of ultraviolet radiation are not well defined and may vary according to the user. It must be noted that stretching the specimens could change the UPF properties. There is no independent method for determining the true value. 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 measured wavelength interval over this spectral range should not be greater than 5 nm. Calibrate the spectrophotometer or spectroradiometer according to manufacturer instructions. The spectrophotometer or spectroradiometer shall have a spectral bandpass of 5 nm or aacc over the spectral range of nm or less to nm or more. Illumination and viewing geometries.

The contribution of stray radiation within the instrument, including that due to sample fluorescence, shall produce an error of less than 0. Instrument Verification and Calibration 5. Allow aatdc specimen to remain submerged for 30 minutes. Avoid evaporative reduction of the moisture content below the specified level before the actual UV transmission measurements are made.

In this geometry the specimen is illuminated by an internally illuminated integrating sphere. In Marchan ul- A1. Apparatus and Materials 8. If the fabric has low moisture absorption, repeat the soaking and wringing steps.

Although integration is indicated from nm to the stated wavelengths, little or no contribution will occur in the nm region. Aatfc such precision information is available, users of the method should use standard statistical techniques in making any comparison of test results for betweenlaboratory averages.

Purpose and Scope 1. The precautions are ancillary to the testing procedures and are not intended to be all inclusive. Uses and Limitations 3. However, the techniques for stretching the specimens are not part of this method and are addressed in a separate test procedure.

Principle ance transmitted and calculated through air to the average effective UV-R irradiance transmitted and calculated through fabric. 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.

Transmittance or blocking of erythemally weighted ultraviolet radiation through fabrics can be defined only in terms of a test method. The error due to the fluorescence can be removed by placing a UV transmitting, visible blocking filter after the sample. Any ray of this beam shall not exceed 0. In this geometry the specimen is illuminated with an unidirectional beam whose axis is not greater than 0.

Note, some samples may not be capable of achieving the specified wet pick-up such as tightly woven synthetic fabrics. Most 10 Related.

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AATCC 183 PDF

Shazuru These safety precautions are for information purposes only. Calibrate the wavelength scale of the spectrophotometer or spectroradiometer aattcc the spectral emission lines of an electrical discharge in mercury vapor. The reference beam impinges on either a portion of the sphere wall or a reference material mounted at a diametrically opposed port opening. In this geometry the specimen is illuminated with an unidirectional beam whose axis is not greater than 0. Appendix A Spectrophotometer or Spectroradiometer Specifications The contribution of stray radiation within the instrument, including that due to sample fluorescence, shall produce an error of less than 0. 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. American standards for UV-protective textiles.

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They provide textiles with remarkable resistance to odors caused by microorganisms, often without detracting from the appearance or feel of the fabric. With the social rise of more active lifestyles, the demand for fabrics with this specific technonology has become greater than ever. Not only is this key in the sports and commercial world, but even more important in the medical world. Some powerful antimicrobial textiles may prevent infections by killing contaminants of public health concern, such as MRSA, should they be deposited on the fabric. Whether the antimicrobial agent is woven into the textile as a thread or applied to the textile surface as a liquid, testing is critical to ensure performance. Laundering is a main source of fabric degradation, so companies often request standardized laundering prior to AATCC tests. Below, you will find a summary of the AATCC test method, along with some of its strengths and weaknesses.

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