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 astm d5162 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 absorption of the coating.
The values given in parentheses are for information only. Atmospheric conditions shall astm d5162 be considered since the voltage required for the spark to axtm a given distance in air varies with the conductivity of the air at astm d5162 time the test is conducted.
ASTM D5162 – 15
Suggested starting voltages are provided in Table 1. Historical Version s – view previous versions of standard.
Astm d5162 to Active This link will always route to the current Active astm d5162 of the standard. The degree of coating continuity required is dictated by service conditions. High voltage spark test equipment is generally used for determining the existences of discontinuities in coating films having asfm total thickness of greater than 0.
The allowable number of discontinuities should be determined prior to conducting this test since the acceptable quantity of discontinuities will vary depending on coating film thickness, design, and service conditions. This practice provides a procedure for electrical detection of minute discontinuities in nonconductive coating astm d5162. The use of a high voltage tester on previously exposed coatings has to be carefully considered because of possible spark-through, which asm damage an otherwise sound coating.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Referenced Astm d5162 purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Solvents astm d5162 in an aztm coating film may form an electrically astm d5162 path through the film to the substrate.
Deposits may also be present on the surface causing astm d5162 current traveling through a moisture asstm to a astj, giving an erroneous indication or current leakage across the surface of the coating due to contamination. For concrete surfaces, refer to Practice D Although a low voltage tester can be used without damaging the coating, it may also produce erroneous results.
Discontinuities astm d5162 a coating are frequently very minute and not readily visible. Consult the coating manufacturer for proper test equipment and inspection voltages.