Standard

NS-EN ISO 2039-2:1999

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1.1 This part of IS0 2039 specifies a method for determining the indentation hardness of plastics by means of the Rockwell hardness tester using the Rockwell M, L and R hardness scales. 1.2 A Rockwell hardness number is directly related to the indentation hardness of a plastic material; the higher the Rockwell hardness number, the harder the material. Due to a short overlap of Rockwell hardness scales by this procedure, two different Rockwell hardness numbers of different scales may be obtained on the same material, both of which may be technically correct. and then followed by a return to the same minor load, all at specified limits for times of loading. The actual measurement is based on the total depth of penetration, minus the elastic recovery after a fixed time following removal of the major load, minus the penetration resulting from the minor load. The Rockwell hardness number is derived from the net increase in depth of impression as the load on an indentor is increased from a fixed minor load to a major load and then returned to the same minor load. 3.2 Each Rockwell hardness scale division represents 0,002 mm vertical movement of the indentor. In practice, the Rockwell hardness number is derived from the following relationship : 1.3 For materials having high creep and recovery, the timefactors involved in application of the major and minor loads have a considerable effect on the results of the measurements. 1.4 An alternative method of using the apparatus to give hardness on the Rockwell-alpha hardness scale is specified in the annex which shows how this scale may be related to the hardness measurement of IS0 2039-1.

Dokumentinformasjon

  • Standard fra SN
  • Publisert:
  • Utgave: 1
  • Versjon: 1
  • Varetype: NAT
  • ICS 83.080.01
  • ICS 83.080.10
  • National Committee SN/K 138/ NS 416

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