Lautaro,

        There are a number of "methods" (over 30 reported) for measuring
     the hardness of materials, of which Shore is only one!

        From what I understand, the Shore method makes use of a
     scleromoter.  Basically, a small diamond pointed hammer weighing 2.5g
     is allowed to free fall 250mm down a glass tube (graduated into 140
     parts) The hardness is related to how far back the hammer rebounds
     after its first rebound off the material sample. ASTM E448 has the
     basic outline for the methodology, so I would take a look at that if
     you are planning on using Shore tests

        Other common methods include

        Brinell - a 10mm steel ball is pushed into the sample with a set
                load and time, hardness is related to the size of the mark
                left in the sample. Not very good for very hard materials
                See ASTM E10
        Vickers - Diamond tipped, square based pyramid pushed into the
                sample, again hardness relates to the size and shape of the
                mark left behind.  See ASTM E92
        Rockwell - uses either a 1.58mm ball @ 100Kg (Scale B) or a diamond
                cone @ 150Kg (Scale C) this time the output dial indictaes
                depth of penetration which can be converted to an
                indication of hardness. See ASTM E18

        Microhardness machines are used where the sample is either very
     thin such as platings or very soft and is often based on the Vickers
     or Knoop methods, See ASTM E384

                Good Luck,



     Roger

______________________________ Reply Separator _________________________________
Subject: [TN] Shore hardness
Author:  "TechNet E-Mail Forum." <[log in to unmask]> at #email
Date:    25/05/99 19:53


Please, send my a message if you know how does the shore harness method
works. I need inmformation urgent!
I must do a work: harness of different materials, any idea?
  Thanks!!!!

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