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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Its use on a coating previously exposed to an immersion condition has often resulted in damage to the coating and has astm d5162 erroneous detection of discontinuities due astm d5162 permeation or moisture absorption of the coating.
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. aatm
Link to Active This link will always route to the current Active version of the standard. Atmospheric conditions shall also be considered since the voltage required for the spark to gap a given astm d5162 in air varies with the conductivity of the air at the time the test is conducted.
It is the responsibility of astm d5162 user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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. Wstm 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.
astm d5162 The degree of coating continuity required is dictated by service conditions. The values given in parentheses are for information only.
For concrete aztm, refer to Practice D Solvents retained in an uncured coating film astm d5162 form an astm d5162 conductive path through the film to the substrate. Discontinuities in a coating are frequently very minute and not readily visible.
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. The allowable number of discontinuities should be determined prior to conducting this test astm d5162 the acceptable quantity of discontinuities will vary depending on coating film thickness, design, and service conditions.
Historical Version s – view astm d5162 versions of standard.
Consult the astm d5162 manufacturer for proper test equipment and inspection voltages. High voltage spark test equipment is generally used for determining the existences of discontinuities in coating films having a astm d5162 thickness of greater than 0.