The ASTM D8008 Standard Practice for Representative Field Sampling of Transportation Coatings includes procedures for obtaining representative field samples of mixed or unmixed water-based, solvent-based, or other liquid transportation coatings from drums, carrying cases, or machine strip cans.
Significado e uso

5.1 For the quality assessment and/or approval of traffic coatings stored on site, it is usually necessary to obtain representative samples for testing. Proper sampling of traffic coatings is a skilled operation, and if not done correctly with the appropriate equipment and procedures, the sample may inadvertently fail one or more specification tests when evaluated by the test laboratory. Test results that may be affected include solids content, resin content, TiO 2 contente, thermal aging stability, freeze-thaw stability, and drying time. Any of these may inadvertently result in a non-approval or penalty.

Prática padrão ASTM D8008-2015 para amostragem representativa de campo de revestimentos de transporte

Etapa 1: Escopo

1.1 The practice includes procedures for obtaining representative field samples of mixed or unmixed water-based, solvent-based, or other liquid transportation coatings from drums, carrying cases, or machine strip cans. Transportation paint samples are typically taken from storage containers on site by paint suppliers or government agencies for laboratory testing to determine product quality and/or approval prior to stripping. It is important that the samples taken are “representative” (having a composition that reflects the overall composition of the container). Although traffic coatings can remain uniform for weeks or months, some coatings can layer and become uneven over time. Obtaining representative samples can be challenging, especially in a field setting. The required method for obtaining a liquid sample is to mix the sample well until uniform and then sample the mixture from the top. If complete mixing cannot be verified, an alternative is to obtain the sample using a liquid tube sampling device. These devices are capable of capturing the paint core from top to bottom from the container. An internal or external rod-tube sampler is recommended for sample extraction. The internal rod tube sampler is the preferred sampler.

1.2 The practice of selecting representative samples shall be agreed in writing between the parties supplying the product and the parties testing the product.

1.3 Valores em polegadas-libras serão considerados valores padrão. Os valores dados entre parênteses são transformações matemáticas de unidades SI e são apenas para referência e não são considerados padrão.

1.4 Esta norma não se destina a abordar todas as questões de segurança, caso existam, associado ao seu uso. É responsabilidade dos usuários desta norma estabelecer práticas adequadas de segurança e saúde e determinar a aplicabilidade das restrições regulatórias antes do uso..