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Protective fabrics somehow has become part and parcel of the environ¬ment, so the spinning and weaving industry was involved in using fabrics in noil- traditional fields as medicine, agriculture and engineering. these fabrics were designed to protect who wears them from the cruel effects of the environment which may cause great harms which lead to late. Fabrics which protect from U. V. R. arc considered as one of the modern uses of fabrics. Sunlight carries for humanity uncountable blessings; nevertheless, expo¬sure to direct sun rays for a long period of time causes many diseases. So sun rays arc a double edge weapon, as it is essential for the formation of vitamin "D" in the human body, while it is harmful in the range of weave length between 280 - 320 nanometer. So the human kind need protection against it. These rays have the ability to penetrate through skin layers. Due to the clever and super system of the human body, ihc skin cells recieve sun rays, and absorbs the harmful (U. V. R.) and transfer it again outside skin cells by an exere ¬tion process, to get rid of these rays. In.! this has a certain limit as the quantity of rays in excess to. this process remain in the: body and is converted into a form of a disease, as it cause burns, and iniecions. in the skin. Some of the cells in skin layers, which carry melamine dye, give the skin brown colour which increases skin self protection against (U. V. R.). As the time passes by and with the repetition of exposure to sun rays, that leads to occurrence of changes in the D. N. A., and destruction of skin cells, con-sequently skin cancer occurs. So the deep concern with studying the cffects of the (U. V. R.) on the skin became of special importance due to the increase of the rale of skin cancer disease in several countries. As the clothing is the protective barrier from these rays, so the research was concerned in studying this specialty, by producing 15 samples woven from polyester hollow fibers, which practical experiments had proved that polyester is one of weaving materials of least penetration of (U. V. R.). Those samples were of four different weaving structures which are: plain 1/1, twill 2/1, twill 2/2, and twill 3/1 each of the four structures used was pro¬duced with four different numbers of picks per cm which are (16, 18, 20 and 22) picks/cm. After that, was performed a test To measure the penetration of the (U. V. R.) through these produced fabrics at different wave lengths: 290, 300. 310, 320, 330. 340, 350, 360, 370. 380, 390, 400 nanometer. After that the results of these tests were tabulated, and statistical analysis was done, and the graphical relations were drawn. After that, the samples were arranged according to ils functional suitability as fabrics, protective against (U. V.R.). Also was performed tests for air penetrability, thickness, water absorption, the weight of fabric per meter square. Also the results of these tests were listed and studying the range of its effect on the criteria of (U. V. R.) penetrability.
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