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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Although a low astm d5162 tester can be used without damaging the coating, it may also produce erroneous results. D51162 concrete surfaces, refer to Practice D Referenced Documents purchase separately Astm d5162 documents listed below are referenced within the subject standard but are not provided as part of the standard. Astm d5162 use on a coating previously exposed to an immersion condition has often resulted in damage to the coating and has produced erroneous detection of discontinuities due to permeation d5612 moisture absorption of the coating.
Discontinuities in a coating are frequently very minute and not readily visible.
Consult the coating manufacturer for proper test equipment and inspection voltages. It is the responsibility of the user astm d5162 this standard to establish appropriate astm d5162 and health practices and determine the applicability of regulatory limitations prior to use.
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 astj sound coating. This practice astm d5162 a procedure for electrical detection of minute discontinuities in nonconductive coating f5162. Deposits may also be present on the surface causing telegraphing current traveling astm d5162 a moisture path to a discontinuity, giving an erroneous indication or current leakage across the surface of the coating due to contamination.
The values astm d5162 in parentheses are for information only.
High voltage spark test equipment is generally used for determining the existences of discontinuities in coating films having a total thickness of greater than 0. Solvents retained in an uncured coating film d51622 form an electrically conductive path through the film to the substrate. Atmospheric conditions shall also be considered since the voltage required for the spark astm d5162 gap a given distance in air varies with the conductivity astm d5162 the air at the time the test is conducted.
The allowable number of astm d5162 should be determined prior to conducting this test since the acceptable quantity of discontinuities will vary depending on astm d5162 film thickness, design, and service conditions. Historical Version s – view previous versions of standard.
The degree of coating continuity required is dictated by service conditions. Link to Active This link will always route to the current Active version of the standard. Suggested starting voltages are provided in Table 1. astm d5162