3.1.5. Minimum ignition temperature of a dust layer
(ASTM E 2021, standard test method for hot surface
ignition temperature of dust layers)
This Minimum Ignition Temperature (MIT) test determines the
lowest temperature capable of igniting a dust layer of standard
thickness (5e12.7 mm). The MIT is an important factor in evaluating
the ignition sensitivity of dusts to such ignition sources as
heated environments, hot surfaces, and friction sparks. The lower
value of MITcloud or MITlayer is used to specify the maximum surface
temperature of electrical devices in hazardous areas, per the
National Electric Code.
3.1.6. Minimum ignition energy (ASTM E 2019, standard test
method for minimum ignition energy of a dust cloud in air)
The Minimum Ignition Energy (MIE) test determines the lowest
electrostatic spark energy that is capable of igniting a dust cloud at
its optimum ignitable concentration. The test is used primarily to
assess the susceptibility of dust clouds to ignition by low energy
sources such as electrostatic sparks.
3.1.7. Electrostatic volume resistivity (ASTM D 257, standard test
methods for DC resistance or conductance of insulating materials)
This test measures the electrical resistance of a powder layer.
Volume Resistivity classifies powders as low, moderately, or highly
insulating. Insulating powders have a propensity to retain static
charge and can produce hazardous electrostatic discharges when
exposed to grounded facilities, equipment, or personnel.
3.1.5. Minimum ignition temperature of a dust layer
(ASTM E 2021, standard test method for hot surface
ignition temperature of dust layers)
This Minimum Ignition Temperature (MIT) test determines the
lowest temperature capable of igniting a dust layer of standard
thickness (5e12.7 mm). The MIT is an important factor in evaluating
the ignition sensitivity of dusts to such ignition sources as
heated environments, hot surfaces, and friction sparks. The lower
value of MITcloud or MITlayer is used to specify the maximum surface
temperature of electrical devices in hazardous areas, per the
National Electric Code.
3.1.6. Minimum ignition energy (ASTM E 2019, standard test
method for minimum ignition energy of a dust cloud in air)
The Minimum Ignition Energy (MIE) test determines the lowest
electrostatic spark energy that is capable of igniting a dust cloud at
its optimum ignitable concentration. The test is used primarily to
assess the susceptibility of dust clouds to ignition by low energy
sources such as electrostatic sparks.
3.1.7. Electrostatic volume resistivity (ASTM D 257, standard test
methods for DC resistance or conductance of insulating materials)
This test measures the electrical resistance of a powder layer.
Volume Resistivity classifies powders as low, moderately, or highly
insulating. Insulating powders have a propensity to retain static
charge and can produce hazardous electrostatic discharges when
exposed to grounded facilities, equipment, or personnel.
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