This International Standard is concerned with the testing of Type A Shore and Type D Shore durometers used to perform hardness tests as described in ISO 868.
EN ISO 21509:2015 Referenced Document
ISO 291:2005 Plastics - Standard atmospheres for conditioning and testing
ISO 868:2003 Plastics and ebonite - Determination of indentation hardness by means of a durometer (Shore hardness)
EN ISO 21509:2015 history
2015EN ISO 21509:2015 Plastics and ebonite - Verification of Shore durometers