Active Standard ASTM D7642 | Developed by Subcommittee: D13.11
Book of Standards Volume: 07.02
Significance and Use
5.2 The practice provides procedures for the value setting for calibration cotton standards. These procedures are for use by cotton fiber testing organizations that establish standard values on candidate bales that will be utilized as calibration cotton standards for cotton classification instruments on the level of the benchmark cottons.
1.1 This practice provides instructions for the development of calibration cotton standards by establishing cotton fiber values for micronaire, length, uniformity index, and strength. The purpose of calibration cotton standards is for calibration of cotton classification instruments to the level of the internationally recognized United States Department of Agriculture (USDA) Benchmark Reference Cotton Standards. The USDA has established calibration cotton standards for domestic upland and Extra Long Staple (ELS) cottons and this practice provides an instruction for other geographical regions to establish their own calibration cotton standards for cotton classification instruments.
1.4 The calibration cotton established by this practice is not valid for use as a micronaire calibration standard. The micronaire standard value is not for the instrument calibration of the micronaire module; it is utilized by the instrument for the correction of the strength measurement during the calibration routine.
ICS Number Code 59.060.10 (Natural fibres)