HRD - ASTM E18 & EN ISO 6508

  • reference blocks manufactured in accordance with EN ISO 6508-3 and ASTM E18-A4
  • for the annual indirect verification of the HRD hardness scale, the use of 3 blocks is necessary in the hardness ranges: 40~47 HRD, 55~63 HRD, 70~77 HRD
  • for purpose of routine checking, only one block with a nominal hardness corresponding approximately to that of the tests to be performed will be used
  • available as standard with ISO certificate and optional with UKAS certificate and/or marked with a hexagonal grid ranging from 2 mm to 6 mm (not 0.5 mm) for greater ease of testing