ASTM-D-1630

r Drive, West Conshohocken, PA 19428. TABLE 2 ASTM Test Method D 1630 Type 1 Precision A—Abrasion Index Material Mean Level Within Laboratories B Between Laboratories s r r ( r ) S R R ( R ) Natural Rubber (NR) 48.3 C 4.3 12.1 25.0 12.2 34.6 71.6 NR/Polybutadiene 130.8 5.5 15.6 11.9 25.2 71.5 54.6 Nitrile Rubber 210.5 20.3 57.3 27.2 70.6 199.9 94.9 Pooled or Averaged Values 129.9 12.4 35.0 26.9 43.9 124.2 95.6 AThis is short-term precision (days). BSymbols are de?ned as follows: s r 5 Within laboratory standard deviation. r 5 Repeatability (in measurement units). (r) 5 Repeatability (in percent). S R 5 Between laboratory standard deviation. R 5 Reproducibility (in measurement units). (R) 5 Reproducibility (in percent). CMean level values as abrasive index (unitless ratio). D 1630 4