Standard Practice for Determining Precision for Test Method Standards in the Rubber and Carbon Black Industries

1.1 This practice presents guidelines for preparing clear, meaningful precision statements for test method standards under the jurisdiction of ASTM Committee D-11 on Rubber Testing and for ASTM Committee D-24 on Carbon Black Testing. It explains the potential uses for standard test methods and gives the requirements for interlaboratory programs needed in precision formulation, the calculation algorithms for precision, and the format for expressing precision.

1.2 Test methods are used in many ways in technology. This broad usage requires careful consideration in assessing their general precision and, where pertinent, their accuracy. Clearly outlining the objectives and the uses of test methods prior to the determination of test precision is essential. A critical requirement for this is the development of a standardized nomenclature system. This practice addresses these and other issues important in evaluating precision for test method standards.

1.3 This practice is divided into the following sections:

Section Terminology 3 Significance and Use 4 General Principles 5 Organizing an Interlaboratory Precision Program 6 Analysis Concepts for Interlaboratory Test Data 7 Calculating the Precision Parameters 8 Format for Precision and Bias Section (Clause) of Standard 9 Statistical Model for Precision Testing Annex A1 Practice E 691 Calculations for Cell Average Outliers: h-values AnnexA2 Practice E 691 Calculations for Cell Standard Deviation Outliers: Annex A3 k-values Establishing a Functional Relationship Between r, R, and M Annex A4 Procedure for Carbon Black Precision Evaluation Annex A5 Spreadsheet Calculation Formulas for Precision Parameters Annex A6 An Example of Precision Calculation-Mooney Viscosity Annex A7

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 and health practices and determine the applicability of regulatory limitations prior to use.