Anti-static coat detection method
Detection of anti-static cloth gown and outside pollution particles attached, there are four detection methods: HELMKE drum method (roller method, ASTM test method is equivalent) ASTM's F-51 method (microscopy), F-51 repair permits law ( counting method), and vibration test method (vibration method).
(1) drum method (Helmke Drum Test) side of the sample is placed in a rotating drum in the opening rotation, determine the level of cleanliness of dust from grain bins particle sampling, determination of the number of particles with a particle counter . Size of the rotary drum 43cm × 33cm, inside the blade of a bucket 4, the bucket of the number of revolutions 10 rpm / min.
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(2) ASTM-F-51 Amendment Act (counting) the lining of the air through the test to measure dust particle size and number with a particle counter. The specimen is placed on the bench with metal mesh, with the sampler (with a 47mm filter holder instead of a) contacting attracted by the amount of air is 28L/min.
(3) ASTM-F-51 method (microscopy) test probe equipped with a filter membrane, directly connected to the metering pump suction, the amount of air through for 28L/min. The lining of the air through the test, the dust particles contained in the air caught by the filter to the test, and observed with a microscope of 400 times the number of dust particles statistical test. 0.5-5 and the number of read-out of more than 5 at the particle filter. In the membrane emblazoned with 3.08mm grid, you can read the number of particles within a grid.
(4) The sample is placed in a small vibration method indoors, twisting vibration generated by the particles, measured by a particle counter. Meanwhile, the large particles (25 or more) trapped on the filter, the number of particles is read out. Air volume of 3.5 ft / min (0.099m/mim), the vibration frequency of 150 beats / min.
