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1.0
Scope
1.1
This test is used to determine the electrostatic properties of materials in filmed
and sheet form, by measuring the time required to induce a charge on the
surface of the material, measure the intensity and polarity of the charge, as well
as the time required for complete dissipation of the induced charge.
1.2
This method does not determine the surface, volume or insulation resistivities of
the materials.
2.0 Definition
2.1
Electrostatic properties are defined as the ability of a material, when grounded, to
dissipate a charge induced on the surface of the material.
3.0
Apparatus
3.1
A metal template, 5 by 3 by 1/8 inches.
3.2
A high voltage source, at least 0 to 5kV, positive and negative.
3.3
An electrometer for measuring volts, amperes and ohms with a full scale reading
of 0.01, 0.1, 10 and 100, or an oscilloscope with a response of 1 microsecond per
division, or equivalent.
3.4
Electrostatic test chamber
3.5
A single channel, pen type recorder with speeds of 0.5, 1.0, 2.0, 4.0 and 8.0
inches per minute and per second.
3.6
A desiccating chamber for conditioning specimens.
3.7
Two knife blade switches, hooked up so that when one is opened the other will
close.
3.8
The equipment shall be assembled as illustrated in Figure 2.
3.9
A chamber or room uniformly maintained at 73° ±3.5° F and 50 ±5 percent
relative humidity in which to perform tests.
4.0
Specimens
4.1
Select specimens at random and in sufficient number to represent adequately the
variation of the material.
required.
4.2
Each specimen shall be 5 by 3 inches and shall be free of defects such as holes,
cracks and tears. If the specimen is coated, the coating shall be continuous.
APPENDIX A
Method 4046
Electrostatic Properties of Materials
A minimum of three specimens per condition are
30
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