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.
의미와 용도

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 콘텐츠, thermal aging stability, freeze-thaw stability, and drying time. Any of these may inadvertently result in a non-approval or penalty.

ASTM D8008-2015 운송 코팅의 대표적인 현장 샘플링에 대한 표준 관행

단계 1: 범위

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 Values in inch-pounds shall be considered as standard values. 괄호 안의 값은 SI 단위의 수학적 변환이며 참조용일 뿐이며 표준으로 간주되지 않습니다..

1.4 이 표준은 모든 안전 문제를 해결하기 위한 것이 아닙니다., 만약에 어떠한, 그 사용과 관련된. 적절한 안전 및 보건 관행을 확립하고 사용 전에 규제 제한의 적용 가능성을 결정하는 것은 이 표준 사용자의 책임입니다..