SANS 705-2009 Vegetable-tanned harness and bridle leathers《植物鞣马具及僵绳用皮革》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

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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 978-0-626-22410-3 SANS 705:2009Edition 1SOUTH AFRICAN NATIONAL STANDARD Vegetable-tanned harness and bridle leathers Published by SABS Standards Div

4、ision 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 705:2009 Edition 1 Table of changes Change No. Date Scope Foreword This South African standard was approved by National Committee SABS SC 120B, Leather Leather, process

5、ed, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in May 2009. This document supersedes CKS 284:1971 (first edition). Annex A forms an integral part of this document. SANS 705:2009 Edition 1 1 Contents P

6、age Foreword 1 Scope . 3 2 Normative references . 3 3 Definitions 3 4 Requirements . 4 4.1 Physical requirements 4 4.2 Chemical requirements 5 5 Methods of test 5 5.1 Conditioning of test specimens and test conditions . 5 5.2 Resistance of finish to dry rubbing . 5 5.3 Resistance to grain cracking 5

7、 5.4 Breaking strength . 5 5.5 pH Value . 6 5.6 Grease content . 6 5.7 Moisture content . 6 Annex A (normative) Notes to purchasers 7 SANS 705:2009 Edition 1 2 This page is intentionally left blank SANS 705:2009 Edition 1 3 Vegetable-tanned harness and bridle leathers 1 Scope This standard covers ve

8、getable-tanned harness and bridle leathers. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any ame

9、ndments) applies. Information on currently valid national and international standards can be obtained from the SABS Standards Division. SANS 5616 (SABS SM 616), Preparation of samples (leather, elastomeric material and other footwear materials). SANS 5617 (SABS SM 617), Determination of water conten

10、t in leather. SANS 5618 (SABS SM 618), Leather Matter extractable by petroleum ether. SANS 5626 (SABS SM 626), Leather and footwear components pH value and difference figure of an aqueous extract. SANS 5630 (SABS SM 630), Determination of resistance to grain cracking of leather. SANS 5636 (SABS SM 6

11、36), Determination of (a) tensile strength, (b) percentage elongation caused by a specified force, (c) percentage elongation at break of leather. SANS 6080 (SABS SM 1080), Leather and other footwear materials Resistance to to-and-fro rubbing. 3 Definitions For the purposes of this document, the foll

12、owing definitions apply. 3.1 back each part of a hide from which the bellies have been trimmed off, and that has been cut into two along the backbone 3.2 butt double back with the shoulder cut off at right angles to the line of the backbone at the break of the fore flank SANS 705:2009 Edition 1 4 3.

13、3 side half a bovine hide that has been cut along the backbone line 4 Requirements 4.1 Physical requirements 4.1.1 General The leather shall be vegetable-tanned leather and may have been syntan retanned. It shall be free from open scratches, excessive tick marks, and bacterial damage on the grain su

14、rface, from deep flay cuts on the flesh side, and from other damage which may impair its wearing properties. Only one brand mark, of area not exceeding 6,5 dm2, shall be permissible on a back, side, or butt. 4.1.2 Form The leather shall be supplied in backs, sides, or butts1), as specified by the pu

15、rchaser (see annex A). Backs shall be well trimmed, and free from flanks and tailings. Sides shall be well trimmed. Butts shall be trimmed square, with the belly edges parallel to each other and the shoulder end cut at right angles to the belly edges. 4.1.3 Thickness The thickness of the leather (ot

16、her than strap leather see 4.1.4) shall conform to the values given below appropriate to the type of leather specified by the purchaser (see annex A): a) Bridle leather. The thickness shall be 3 mm to 4 mm. b) Harness leather. The thickness shall be 5 mm to 6 mm. 4.1.4 Dimensions of strap leather ba

17、cks When backs for specific use as strap leathers are required by the purchaser (see annex A), the dimensions of each back shall conform to the values given below appropriate to the grade specified by the purchaser (see annex A): a) Light grade. The thickness shall be 3,5 mm 0,25 mm, and the length

18、and width shall be such that it is possible to obtain from it, after trimming of the back, a piece of size at least 1 850 mm 450 mm. b) Heavy grade. The thickness shall be 5,0 mm 0,25 mm, and the length and width shall be such that it is possible to obtain from it, after trimming of the back, a piec

19、e of size at least 1 500 mm 600 mm. 4.1.5 Finish The leather shall have a natural finish or stained finish as required by the purchaser (see annex A), but shall not have a pigment finish. The leather shall be evenly coloured, free from oxidized patches of tan, and shall have a tight grain. In the ca

20、se of a stained finish, the colour shall be as specified by the purchaser (see annex A). When tested in accordance with 5.2, the finish shall be fast to dry rubbing. 1) Sides and butts are not suitable for use as strap leathers. SANS 705:2009 Edition 1 5 4.1.6 Resistance to grain cracking When teste

21、d in accordance with 5.3, the leather shall not crack when bent, grain side out, through 180 over a mandrel of nominal diameter 6,35 mm. 4.1.7 Breaking strength The breaking strength, determined in accordance with 5.4, of a dumb-bell shaped leather specimen cut parallel to the backbone, shall be as

22、follows: a) Leather of thickness 3,25 mm to 3,75 mm: 880 N, min. b) Leather of thickness 4,75 mm to 5,25 mm: 1 100 N, min. 4.2 Chemical requirements 4.2.1 pH Value The pH value of the leather, determined in accordance with 5.5, shall be at least 3,3. 4.2.2 Grease content The grease content of the le

23、ather, determined in accordance with 5.6 on a 14 % moisture basis, shall be as follows: a) Harness leather: 10 %, min. b) Bridle leather: 8 %, min. 4.2.3 Moisture content The moisture content of the leather, determined in accordance with 5.7, shall not exceed 17 %. 5 Methods of test 5.1 Conditioning

24、 of test specimens and test conditions Condition each test specimen, in accordance with SANS 5616, and carry out the tests without removing the specimens from the conditioned atmosphere. 5.2 Resistance of finish to dry rubbing Use SANS 6080. 5.3 Resistance to grain cracking Use SANS 5630. 5.4 Breaki

25、ng strength Use SANS 5636, but use dumb-bell test specimens that have a width at the waist of 12,7 mm. SANS 705:2009 Edition 1 6 5.5 pH Value Use SANS 5626. 5.6 Grease content Use SANS 5618. 5.7 Moisture content Use SANS 5617. SANS 705:2009 Edition 1 7 Annex A (normative) Notes to purchasers The fol

26、lowing requirements shall be specified in tender invitations and in the order or contract: a) the form (see 4.1.2); b) the type of leather (see 4.1.3); c) when relevant, that strap leather backs are required, and the grade, i.e. light or heavy (see 4.1.4); and d) the type of finish and, when relevan

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