Q-Fog SSP Salt Spray Tester
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ASTM B117 ISO 9227
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Salt spray test is an accelerated corrosion test that produces a corrosive attack to the coated samples in order to predict its suitability in use as a protective finish. The appearance of corrosion products (oxides) is evaluated after a period of time. Test duration depends on the corrosion resistance of the coating; the more corrosion resistant the coating is, the longer the period in testing without showing signs of corrosion. The apparatus for testing consists of a closed testing chamber, where a salted solution (mainly, a solution of sodium chloride) is sprayed by means of a nozzle. This produces a corroding environment in the chamber and thus, parts in it are attacked under this severe corroding atmosphere. The lab must insure proper handling and mounting of samples and careful measurement of exposure times.
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Taber 535 Abraser
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ASTM B733 ASTM G195 ASTM F1978 ISO 10074 MIL-A-8625 FED-STD-141 Method 6192
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Abrasion testing, or wear resistance, is a common specification requirement. Samples of material to be tested are mounted on the abraser’s rotating turntable and subjected to the wearing action of two abrasive wheels applied at a specific pressure. A unique ’X’ pattern of abrasion, an exclusive Taber feature, is produced by the rotary rub-wear action of the wheels. Wear action occurs as the wheels are turned by the rotating sample. The axis of rotation of the wheels is displaced from that of the turntable so that a sliding action is generated as they rotate, abrading the material. An area of 30 square centimeters is subjected to wear, and a complete circle on the material surface is abraded at all angles of grain or weave.
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MicroMet 5104 Hardness Tester
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ASTM B578 ASTM E384
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Various military and industrial plating specifications require periodic testing for microhardness - most notable are those for electroless nickel and gold. Microhardness refers to the measurement of indentations made when a specific indenter is pressed into a surface under light loads (less than 1kg/sq ft). The indenter can be either the Vickers diamond pyramid or the Knoop elongated diamond pyramid. The surface being tested generally requires a smooth finish; the smaller the load, the higher the surface finish required. A precision microscope is used to measure the indentation, usually under a magnification of around 500x and with a measurement accuracy of +0.5 micrometers.
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