DIN EN ISO 3953:2011-05

This document (EN ISO 3953:2011) has been prepared by Technical Committee ISO/TC 119 "Powder metallurgy", in collaboration with Technical Committee CEN/SS M 11 "Powder metallurgy", the secretariat of which is held by CCMC. The responsible German Committee is Working Committee NA 145-01-02 AA "Probenahme und Prüfverfahren für Pulver (einschließlich Pulver für Hartmetalle)" ("Sampling and testing methods for powders (including powders for hardmetals)") of the Technology of Materials Standards Committee (NWT).
This International Standard specifies a method for the determination of tap density, that means the density of a powder that has been tapped into a container under specified conditions.
This standard differs from DIN ISO 3953:1995-02 as follows: a) in clause 2 "Principle", the information has been deleted that, by agreement, the tapping may be carried out by hand; b) information regarding the accuracy of the balance has been added; c) in subclause 4.3, information regarding the use of a hard rubber slab has been deleted; d) adjustment of an apparent density value in Table 2; e) addition of information in subclause 5.3, that the test should, but not necessarily, be carried out on three test portions; and derived from that, clause 7 regarding the expression of results has been adjusted; f) in subclause 6.3, the description of the procedure when using a hard rubber slab has been deleted; g) the standard has been editorially revised.