A proposal has been made to reinstate withdrawn standard T 421 "Qualitative (including optical microscopic) analysis of mineral filler and mineral coating of paper." This standard was withdrawn in 2003 by the Quality and Standards Management Committee due to lack of progress in its review.
The scope of the method is: This method describes procedures which may be used for the qualitative determination and identification of the mineral constituents of filled and coated papers. Due to the similarity in chemical composition and physical size and shape of some of the various possible constituents contained in a given paper specimen, more precise quantitative methods may at times be required for positive identification. It is recommended that one become thoroughly familiar with this method by analyzing paper samples of known mineral component content.
Because the Standard-Specific Interest Group (SSIG) is currently short of members, this announcement is to solicit new members of the SSIG.
Any individuals who are interested in this Standard may join the SSIG to receive ballots when this method is ready for vote. If you would like to join the SSIG for this project, please notify the Standards Department at mailto:standards@tappi.orgor by fax at +1-770-446-6947 no later than July 15, 2010.