Ultraviolet Radiation through Fabrics
AATCC 183-2004 pdf free.Transmittance or Blocking of Erythemally Weighted Ultraviolet Radiation through Fabrics.
9.1.1 Prior to testing. precondition and condition the test specimens as directed in ASTM D 1776, Standard Practice for Conditioning and Testing Textiles. Condition each specimen for at least 4 h in an atmosphere of 21土I°C (70 2°F) and
65 2% RH by laying cach test specimen separately on a perforated shelf or conditioning rack.
10. Procedure
10.1 Dry Evaluation.
10.1.1 Place the specimen flush against the sample transmission port opening in the sphere.
10.1.2 Make one UV transmission measurement with the specimen oriented in one direction, a second measurement at 0.79 rad (459) to the first and a third at 0.79 rad (459) to the second. Record the individual measurements.
10.1.3 On multicolored specimens, de termine the area of highest UV transmission and make the three measurements in that area.
10.2 Wet Evaluation
10.2.1 Weigh the test specimen. Thoroughly wet out the specimen in distilled water by placing it flat in the bottom ofa beaker and then pour ditilled water into the beaker until the specimen is covered.
Allow the specimen to remain submerged for 30 minutes. Press and move the specimen from time to time to ensure a good Ind uniform penetration. Prepare only one specimen at a time.
10.2.2 Bring the wet pick-up to 150 5% by squeezing the wet specimen between blotting paper (see 6.4) through a hand wringer or similar convenientmeans (such as squeeze between two glass rods). If the fabric has low moisture absorption, repeat the soaking and wringing steps. Note, some samples may not be capable of achieving the specified wet pick-up such as tightly woven synthetic fabrics.
10.2.3 Use plastic wrap over viewing port to protect instrument from water.
10.2.4 Continue as directed in 10.1. Avoid evaporative reduction of the moisture content below the specified level before the actual UV transmission measurements are made.
13.2 Bias Transmittance or blocking of erythemally weighted ultraviolet radiation through fabrics can be defined only in terms of a test method. There is no independent method for determining the true value. As a means of estimating this property, the method has no known bias.
14. References
14.1 ASTM D 1776, Standard Practice for Conditioning and Testing Textiles (see 15.3).
14.2 ASTM E 179, Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials (see 15.3). 14.3 ASTM E 275. Practice for Describing and Measuring Performance of Ultraviolet,Visible and Near-Infrared Spectrophotometers (see 15.3)
14.4 ASTM G 159, Standard Tables for References Solar Spectral Irradiance at Air Mass 1 .5: Direct Normal and Hemispherical for a 37° Tilted Surface (see 15.3).
14.5 ASTM E 1247, Test Method for ldentifying Fluorescence in Object-Color Specimens by Spectrophotometry(see 15.3).
14.6 ASTM E 1348. Test Method for Transmittance and Color by Spectrophotometry using Hemispherical Geometry (see 15.3).
15.1 Spectrophotometers or spectroradiom-eters that meet the requirements of this testmethod are available from a large number ofmanufacturers.
15.2 Available from Schott Inc..400 YorkAve., Duryea PA 18642; tel: 717/457-4485.
15.3 Available from ASTM,100 Barr Har-bor Dr..wWest Conshohocken PA 19428-2959;tel: 610/832-9500; fax: 610/832-9555.
15.4 commission International de LEclairage (CIE)Bureau Central de la CIE.Paris.France.
15.5 Available from AATCC,P.O.Box12215，Research Triangle Park NC27709; tel:919/549-8141; fax: 919/549-8933; e-mail : orders@aatcc.org.AATCC 183 pdf free download.Ultraviolet Radiation through Fabrics