Semnificație și scop
5.1 Many coating properties are significantly affected by dry film thickness, precum aderența, flexibilitate, wear, durabilitate, chemical resistance, and hardness. In order to be able to compare the results obtained by different operators, the film thickness needs to be carefully measured.

5.2 Most protective and high performance coatings are designed to meet the requirements or specifications for the dry film thickness of each coating or the whole system or both. Coatings need to be applied within certain minimum and maximum thickness tolerances so that they can perform their intended function. In addition to potential performance defects, it is uneconomical to use more material than necessary when coating large areas such as floors and walls.

5.3 Occasionally low readings may occur on coatings with rough surfaces. The instrument can allow the user to adjust to prevent this.

5.4 This test method may not be suitable for measuring the thickness of organic coatings on all substrates. The ability of the instrument to detect different interfaces between the coating and the substrate may be hampered if the composition, density, or attenuation of the coating and the substrate are similar, or if the coating is not uniform. If these conditions are considered, verify the operation on a coating/substrate combination of known thickness.

5.5 The multilayer coating has many interfaces, and the instrument will measure the interface separating the two materials with the greatest acoustic difference. Some instruments are able to detect and measure the thickness of individual layers in multi-layer systems.

5.6 The use of this test method is not necessarily limited by the type of substrate material.

ASTM D 6132-2020 “Measurement of Dry Film Thickness of Organic Coatings Applied to Concrete by a Non-destructive Method (adică. Using an Ultrasonic Apparatus)”

Scopul
1.1 The test method describes the accurate and nondestructive measurement of dry film thickness of organic coatings applied to substrates of different materials using ultrasonic film thickness gauges. Measurements can be made on field structures, commercially manufactured products, or laboratory test samples. These types of gauges can accurately measure the dry film thickness of organic coatings on various substrates such as concrete, wood, wall panels, materiale plastice, fiber composites, and metals.

1.2 The test method is not applicable to coatings that are prone to deform under the load of the measuring instrument because the instrument probe is placed directly on the surface of the coating for reading.

1.3 The effective range of instruments using ultrasonic principles is limited by the design of measuring tools. Thickness ranges from 8 μm to 7.60 mm (0.3 la 300 mils).

1.4 Valorile exprimate în unități SI ar trebui considerate valori standard. Alte unități de măsură nu sunt incluse în acest standard.

1.5 Acest standard nu este destinat să abordeze toate problemele de siguranță, dacă există, asociat cu utilizarea acestuia. Este responsabilitatea utilizatorului acestui standard să stabilească siguranța corespunzătoare, practicile de sănătate și de mediu și pentru a determina aplicabilitatea restricțiilor de reglementare înainte de utilizare.

1.6 Acest standard internațional a fost elaborat în conformitate cu principiile de standardizare recunoscute la nivel internațional stabilite în Decizia privind principiile pentru elaborarea standardelor internaționale., Orientări și recomandări emise de Comitetul pentru bariere tehnice în calea comerțului al Organizației Mondiale a Comerțului.