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3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22522-3 SANS 5621:2009Edition 3SOUTH AFRICAN NATIONAL STANDARD Determination of total ash content of leather Published by SABS Standards D
4、ivision 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 5621:2009 Edition 3 Table of changes Change No. Date Scope Foreword This South African standard was approved by National Committee SABS SC 1016A, Test methods leather
5、 and footwear Test methods for leather and footwear, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in July 2009. This document supersedes SABS SM 621:1972 (first revision). SANS 5621:2009 Edition 3 1 Det
6、ermination of total ash content of leather 1 Scope This standard specifies a method for the determination of total ash content of leather. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited ap
7、plies. For undated references, the latest edition of the referenced document (including any amendments) applies. Information on currently valid national and international standards can be obtained from the SABS Standards Division. ISO 4684, Leather Chemical tests Determination of volatile matter. SA
8、NS 5616 (SABS SM 616), Preparation of samples (leather, elastomeric material and other footwear materials). 3 Principle The sample is carbonized and then weighed repeatedly in an open crucible. 4 Apparatus Ordinary laboratory apparatus and in particular: a) Crucibles or dishes that are of glazed por
9、celain, platinum or quartz. b) A muffle furnace that is capable of being maintained at a temperature of 600 C 20 C. c) Dessicator. 5 Preparation of test pieces Prepare the final sample as given in SANS 5616. 6 Procedure 6.1 Weigh out accurately 5 g of the final sample (see clause 5), into a tarred c
10、rucible and place in the furnace at room temperature. SANS 5621:2009 Edition 3 2 6.2 Raise the temperature to 600 C 20 C and maintain this temperature until all the carbon is burnt off. 6.3 Transfer the crucible to a dessicator, cool and weigh. 6.4 Repeat the heating, cooling and weighing until the
11、mass remains constant. 7 Calculation Calculate the total ash content as follows: mAm21= 100 where A is the total ash content, expressed as a percentage; m1is the mass of the test sample, in grams; and m2is the mass of the residue, in grams. To express the result on a 14 % leather moisture basis, mul
12、tiply this value by the factor 86100 cwhere c is the percentage moisture content as determined in ISO 4684. SABS SABS Standards Division The objective of the SABS Standards Division is to develop, promote and maintain South African National Standards. This objective is incorporated in the Standards
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