ASTM D5162-21 Standard Practice for the Test of Discontinuity (Holiday) of Non-Conductive Protective Coating on Metallic Surfaces

The ASTM D5162-21 standard published by the American Testing and Materials Association (ASTM) defines the following test methods for determining discontinuities using two types of test equipment:

• Test Method A: Low-voltage wet sponge method
• Test Method B: High voltage spark testers method

This standard is for metallic substrates. ASTM D4787 standard is applied for concrete surfaces.

For the purposes of the ASTM D5162-21 standard,

• The term discontinuity refers to voids, cracks, fine points, foreign residues or contamination in the coating film that significantly reduces the dielectric strength of the coating film.
• The term holiday, as used in this standard, is a term that describes a discontinuity. Holiday is a hole or gap in the coating film that exposes the substrate to corrosion.
• The term holiday detector refers to a device that detects discontinuities in a non-conductive coating film applied to a conductive surface. A Holiday detector is a device used to inspect fixed equipment or a metallic surface to ensure structural integrity and aid corrosion prevention efforts.
• The term pinhole refers to a film defect characterized by small pore-like defects in the coating that will appear as a discontinuity when fully extended through the film. However, a pinhole in the topcoat may not appear as a discontinuity.

The Holiday detector provides high voltage porosity testing to detect pits, imperfections, holes and more in a wide variety of non-metallic coatings.

A coating is applied to a metallic substrate to prevent corrosion, reduce wear, or reduce product contamination, or all of these. The degree of coating continuity required is determined by service conditions. Discontinuities in a pavement are usually very small and not easily seen. The practice defined in ASTM D5162-21 provides a procedure for the electrical detection of very small discontinuities in non-conductive coating systems.

Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our company also provides discontinuity (holiday) testing services of non-conductive protective coating on metallic surfaces within the framework of ASTM D5162-21 standard, with its trained and expert staff and advanced technological equipment. gives.