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.
It is the responsibility of the user of this astm d5162 to establish appropriate safety and health practices and determine the applicability of regulatory astm d5162 prior to use. Solvents retained in an uncured coating film may form an electrically conductive path through the film to the substrate.
Its 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 or moisture astm d5162 of the coating.
The use of a high voltage tester on 5d162 exposed coatings astm d5162 to be carefully considered because of possible spark-through, which will damage an otherwise sound coating.
The values given in parentheses are for information only. Astm d5162 in a coating are frequently very minute and not readily visible.
Deposits may also be present on the surface causing telegraphing current astm d5162 through a moisture path to a discontinuity, giving an erroneous indication or current leakage across d51662 surface of the coating due to contamination. High voltage spark test equipment is d5126 used for astm d5162 the existences of discontinuities in coating films having a total thickness of greater than 0.
Referenced Documents 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. Although a low voltage tester can be used without damaging the coating, it may also produce erroneous results. astm d5162
Consult the coating manufacturer for astm d5162 test equipment and inspection voltages. For concrete surfaces, refer to Practice D The degree of coating continuity required is dictated by service conditions.
Atmospheric conditions shall also be considered since the voltage required for the atm to gap a given distance in air varies with the conductivity of the air at the astm d5162 the test is conducted. Link to Active This link will always route astm d5162 the current Active version of the standard.
Historical Version s – view previous versions of standard. The allowable number of discontinuities should be determined prior to conducting this test since the acceptable quantity of discontinuities will vary depending astm d5162 coating film thickness, design, and service conditions.