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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The use of a high voltage tester on previously exposed coatings has to be carefully considered because of possible spark-through, astm d5162 will damage an otherwise sound coating. Its use on a coating previously exposed to an immersion condition has often resulted astm d5162 damage to the coating and has produced erroneous detection of discontinuities due to permeation or moisture absorption of the coating.
High voltage spark test equipment is generally used for determining the existences of discontinuities in coating astm d5162 having a total thickness of greater than 0.
It is the responsibility of the user of this standard to establish appropriate safety astm d5162 health practices and determine the applicability of regulatory limitations prior to use. For concrete surfaces, refer to Practice D Atmospheric conditions shall also be considered since the voltage required for astm d5162 spark to gap a given distance in air varies with the conductivity of the air at the time the test is conducted.
The degree of coating continuity required is dictated by service astm d5162. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This practice provides a procedure for electrical detection of minute discontinuities in nonconductive coating systems.
Consult the coating manufacturer for proper test equipment and inspection voltages. Astm d5162 starting voltages are provided in Table 1.
The allowable number of discontinuities should be determined prior to conducting this test since the astm d5162 quantity of discontinuities will vary depending on coating film atsm, design, and service conditions. 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.
Link to Active This link will always route astm d5162 the current Active version of the standard. Solvents retained in an uncured coating film d516 form an electrically conductive path through the film to the substrate.
Discontinuities in a coating are frequently very minute and not readily visible.
astm d5162 Although a low voltage tester can be used without damaging the coating, it may also produce erroneous results. Historical Version s – view previous versions of standard. The values given in parentheses are for information only.