What is a typical textile abrasion resistance?
ASTM D 123 describes as follows
Abrasion, n---the wearing away of any part of a material by rubbing against another surface.
ASTM also has prescribed several methods to quantify abrasion resistance of textile materials these tests are
ASTM D 4966 -- 98 Standard Test Method for Abrasion Resistance of Textile Fabrics (Martindale Abrasion Tester Method) ASTM D 3884 Test Method for Abrasion Resistance of Textile Fabrics (Rotary Platform, Double-Head Method)3 ASTM D 3885 Test Method for Abrasion Resistance of Textile Fabrics (Flexing and Abrasion Method)3 ASTM D 3886 Test Method for Abrasion Resistance of Textile Fabrics (Inflated Diaphragm Method)3 ASTM D 4157 Test Method for Abrasion Resistance of Textile Fabrics (Oscillatory Cylinder Method)3 ASTM D 4158 Test Method for Abrasion Resistance of Textile Fabrics (Uniform Abrasion Method)3 AATCC Test Method 93 Abrasion Resistance of Fabrics: Accelerator Method4 In All of the above materials the tested specimen is rubbed is a particular manner against an abradent which may be a fabric, or a emery sheet or like for either a certain amount of time for for a certain number of strokes or cycles.
At the end of the testing period , any change that may occur to the tested specimen normally 3 types of changes are looked for
1. Mass Loss
2. Color Change
3. Hole formation or yarn breakage
The Earlier these changes occur the poorer the resistance to abrasion.
Factors loke thickness of fabric, piles, any pretreatment to reduce or increace surface friction , etc all have a profound effect on the Abrasion resistance.
In real life, trousers in case of apparel and Upholstery are subject to more abrasion than fabrics used in any other domestic use. In case of fabrics used for industrial application like belts etc are required to have very high abrasion resistance.
ASTM International Book of Standards Volume 7.01 and 7.02
AATCC Technical Manual - 2009
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Canon eos 5d mark II is good for great photos and decent Video. Especially with the full frame sensor depth of field. For the best quality Video you want the Panasonic GH2,… especially with the hack which makes the detail very close to film. The canon gives subpar 720p resolution even in 1080p while the GH2 resolves very fine detail and in 1080p cinema mode can look as detailed as a RED camera. Learn about the Hack and the video Quality Here : http://osgfilms.com/hack-the-panasonic-gh2/ The GH2 is often regarded as the perfect Hybrid. Nikon has some of the most user friendly dslr cameras to just pick up and shoot while Panasonic has the more advanced learning curves with too many features to count. Canon i would say is in the middle in terms of difficulty.
Currently stocked is the Olympus E420. However, for a little more, you can get a much better DSLR
The Canon 5D is a professional grade DSLR. If your looking for recreational use, Canon T2i
Experimenting is the best way to get a perfect exposure, but for starters, get a tripod and try 10 sec. at F/8, ISO 100. Improvise from there, and you'll have great pictures.
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