AATCC 186 pdf free download
AATCC 186 pdf free download.Weather Resistance: UV Light and Moisture Exposure.
1. Purpose and Scope
1.1 This test method provides a procedure for the exposure of textile materials of all kinds, including coated fabrics and products made thereof, in a laboratory arLi ficial weathering exposure apparatus employing fluorescent UV lamps as a light source and using condensing humidity and/or water spray for wetting.
2. Principle
2.1 Specimens are exposed to a fluorescent UV light source and to periodic wetting under controlled conditions. Resistance to degradation is rated in terms of a comparison standard and the exposure criteria, percent loss in strength or percent residual strength (breaking or bursting as appropriate) and/or color change of the material when evaluated under standard textile conditions.
3. Terminology
3.1 breaking strength, n.—the ability or capacity ot a specific material to withstand the ultimate tensile load or force required for rupture (ASTM D 123).
3.2 bursting strength, n.the force or pressure required to rupture a textile by distending it with a force, applied at right angles to the plane of the fabric, under specified conditions.
3.3 fluorescent UV lamp, n.—a lamp in which radiation at 254 nm from a low- pressure mercury arc is transk)rmed to longer wavelength UV by a phosphor.
3.4 irradiance, n.—radiant power per unit area as a function of wavelength expressed as watts per square meter, W/m2.
3.5 radiant energy, n.—cnergy traveling through space in the torm of photons or electromagnetic waves of various lengths.
3.6 spectral energy distribution, n.— the variation of energy due to the source over the wavelength span of the emitted radiation.
3.7 standard atmosphere for testing textiles, n.—air maintained at 21 ± 1°C and 65 ± 2% relative humidity.
3.8 ultraviolet radiation. ii.—radiant energy for which the wavelengths of the monochromatic components are smaller than those for visible radiation and more than about 100 nm.
3.9 UV-A Type Fluorescent UV lamp. n.—a fluorescent UV lamp where radiant emission below 300 nm is less than 2% of its total light output.
3.10 UV-B Type Fluorescent UV lamp, n.—a fluorescent UV lamp where radiant emission below 300 nm is more than 10% of its total light output.
3.11 weather, n.—clirnatic conditions at a given geographic location, including such factors as sunlight, rain, humidity and temperature.
3.12 weather resistance, n.—ability of a material to resist degradation of its properties when exposed to climatic condi tions.
4. Safety Precautions
NOTE: These safety precautions are for information purposes only. The precautions are ancillary to the testing procedures and are not intended to be all inclusive. It is the user’s responsibility to use safe and proper techniques in handling materials in this test method. Manufacturers MUST be consulted (or specitie details such as material safety data sheets and other manufacturer’s recommendations. All OSHA standards and rules must also be consulted and followed.
4. I (Ioi laboratory practices should be followed. Wear safety glasses in all laboratory areas.
4.2 Do not operate the test equipment until the manufacturer’s operating instructions have been read and understood. It is the responsibility of whoever operates the test equipment to conform to the manufacturer’s directions for safe operat ion.
4.3 The test equipment contains high intensity lamps. Do not look directly at the light source. The door to the Lest chamber must be kept closed when the equipment is in operation.
4.4 Before servicing the light sources, allow 30 mm for cool-down after the lamp operation has been terminated.
4.5 When servicing tlie test equipment, shut off both the “off’ switch on the front panel and the main power disconnect switch. When equipped, ensure that the main power light on the machine front panel goes out.AATCC 186 pdf download.
