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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Link to Active Astm d5162 link will always route astm d5162 the current Active version of the standard. Solvents retained in an uncured coating film may form an electrically conductive path through the film to the substrate.
The allowable number of discontinuities should be determined prior to conducting this test since astm d5162 acceptable quantity of discontinuities will vary depending on coating asfm thickness, design, and service conditions.
Consult the coating manufacturer for proper test equipment and inspection voltages.
Astm d5162 values given in parentheses are for information only. For concrete surfaces, refer to Practice D It is the responsibility of astm d5162 user of this standard to establish appropriate safety and health practices astm d5162 determine the applicability of regulatory limitations prior to use. 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 surface of the coating due to ast.
The degree of coating continuity required is dictated by service conditions. Historical Version s – astm d5162 previous versions of standard. 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. Atmospheric conditions shall astm d5162 be considered since the voltage required astm d5162 the spark to gap a given distance in air varies with the conductivity of the air at the time the test is conducted.
Astm d5162 in a coating are frequently very minute and not astm d5162 visible. 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. Its use on atm coating qstm 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 absorption of the coating.
High voltage spark test equipment is generally used for determining the existences of discontinuities in coating films having a total thickness of greater than astm d5162.
This astm d5162 provides a procedure for electrical detection of minute discontinuities in nonconductive coating systems. Although a low voltage tester can be used without damaging the coating, it may also produce erroneous results.