Significado e propósito
5.1 the contrast under specified film thickness is useful covering power parameters of production control and purchase specification.

5.2 the covering power, the greater the per unit area the less they get sufficient to cover the required coating. Portanto, understanding the hiding power is important for coating cost and comparing coating value.

Escopo de
1.1 These test methods determine and report the hiding power of powder coatings based on two parameters:

1.1.1 Método de teste A – Contrast at a given film thickness

1.1.2 Método de teste B — Film thickness with 0.98 (98%) contraste.

Observação 1: measuring the parameters follow the powder coatings industry practice, measurement of hiding power and the relationship between film thickness, rather than test method D344 and D2805 as well as other hiding power test methods used in “taxa de propagação” função.

Teste de poder de ocultação de revestimento em pó ASTM D6441-2016

Observação 2: covering power by spectrophotometry is defined as 0.98 under the contrast of diffusion rate. Please refer to terms D16, D2805 and the Paints and Coatings Testing Manual for definitions of spreading rate and hiding power.

Observação 3: A contrast ratio of 0.98 is generally accepted in the paint industry as representing “completo” concealing of a reflective hiding power measurement. But visually and photologically, it is slightly incomplete.

1.2 this test method covers the through the determination of electrostatic spraying of powder coatings covering power.

1.3 these test methods through reflection and thickness gauge measurement to determine the hiding power. They are restricted to coatings with a minimum CIE-Y reflectivity of 15%.

1.4 para unidades SI serão considerados padrão. Os valores dados entre parênteses são apenas para referência.

1.5 Esta norma não se destina a abordar todas as questões de segurança, caso existam, associado ao seu uso. O usuário desta norma internacional tem a responsabilidade de estabelecer práticas adequadas de segurança e saúde, and determine regulations limit the applicability of before use premise.