ASTM B762-21
Standard Guide of Variables Sampling of Metallic and Inorganic Coatings

Standard No.

ASTM B762-21

Release Date

2021

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM B762-21

Scope

1.1 This guide provides sampling plans that are intended for use in the inspection of metallic and inorganic coatings on products for the purpose of deciding whether submitted lots of coated products comply with the specifications applicable to the coating. 1.2 The sampling plans are variables plans. In plans of this type, several articles of product are drawn from a production lot. A characteristic of the coating on the drawn articles is measured. The values obtained are used to estimate the number of articles in the lot that do not conform to a numerical limit, for example a minimum thickness. The number is compared to a maximum allowable. 1.3 Variables plans can only be used when the characteristic of interest is measurable, the test method gives a numerical measure of the characteristic, and the specification places a numerical limit on the measured value. It is also necessary that the variation of the characteristic from article to article in a production lot be normally distributed (see Appendix X2). Each article must be tested in the same way (for example, coating thickness must be measured at the same location, see X2.7) so that the values from article to article are comparable. If one or more of these conditions are not met, a variables plan cannot be used. Instead, an attributes plan must be used. These are given in Guide B602 and Guide B697. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM B762-21 Referenced Document

• ASTM B602 Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
• ASTM B697 Standard Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings

ASTM B762-21 history

• 2021 ASTM B762-21 Standard Guide of Variables Sampling of Metallic and Inorganic Coatings
• 1990 ASTM B762-90(2016) Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
• 1990 ASTM B762-90(2010) Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
• 1990 ASTM B762-90(2005) Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
• 1990 ASTM B762-90(1999) Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings