Task groups within both ASTM and CEN (ISO) have been doing work on existing . The ASTM practise, D provides a table of suggested test voltages for. 25 Jul ASTM D Standard Practice for Discontinuity (Holiday) Testing of Nonconductive Protective Coat_专业资料。rubber lining test. Designation: D – 00Standard Practice for Discontinuity (Holiday) Testing of Nonconductive Protective.
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This practice provides a procedure for electrical detection of minute discontinuities in nonconductive coating systems.
Discontinuities in astm d5162 coating are frequently very minute and not readily visible. Deposits may also be present on the surface causing telegraphing current traveling through a moisture path to a discontinuity, giving an erroneous indication or current leakage across the astm d5162 of the coating due to contamination.
The allowable number of discontinuities should be determined prior to conducting this test since the acceptable quantity of discontinuities will vary depending on coating film thickness, design, and astm d5162 conditions. For concrete surfaces, refer astm d5162 Practice D Historical Version s – view previous versions of standard.
Solvents retained in astm d5162 uncured coating film may form an electrically conductive path through the film to the substrate. The use of a high voltage tester on previously exposed coatings has to be carefully considered because of possible spark-through, which will damage an otherwise sound coating.
Referenced Astm d5162 purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Suggested starting voltages are provided in Table 1. Atmospheric conditions shall astm d5162 be considered since the voltage required for the spark astm d5162 gap a given distance in air varies 5d162 the conductivity of the air at the time the test is conducted. Although a low voltage tester can be used without damaging the coating, it may also produce erroneous results.
Qstm to Active This link will always route to the current Active version astm d5162 the standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability astm d5162 regulatory limitations prior to use.
The degree of coating continuity astm d5162 is dictated by service conditions. Its use on a coating previously exposed to an immersion condition has often resulted in damage to astm d5162 coating and has produced erroneous detection of discontinuities due to permeation or moisture absorption of the coating.
The values given in parentheses are for information only. High voltage spark aastm equipment is generally used for determining the existences of discontinuities in coating films having a total thickness of greater than 0. Consult the coating manufacturer for proper test equipment astm d5162 inspection voltages.