BS ISO 17551:2018 pdf download – Leather — Pickled sheep pelts — Guidelines for grading on the basis of defect and size This document provides guidance for grading pickled sheep pelts based on size and defects. 2 Normative references There are no normative references in this document. 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 4 General In general, pH requirement of pickled sheep pelts should be ascertained before grading. The pH of the pickled sheep pelt should be 2,0 ± 0,2. For the purpose of the grading system, pickled sheep pelts are graded based on: a) defects; b) size. 5 Grading on the basis of defects 5.1 Grade I Pickled sheep pelts of Grade I should have the following qualities: a) generally free from defects and damages; b) defects and damages not exceeding 10 % of the total area; c) free from defects like score marks, warble holes, meat, fat, pox marks, cockles; d) fleshy with good quality and fine grain. Pickled sheep pelts that belong to Grade I but have a thinner skin should be regarded as Grade II. 5.2 Grade II Pickled sheep pelts of Grade II should have the following qualities: a) defects and damages in the range of 11 % to 20 % of the total area; b) neck and shoulder free from defects and damages. 5.3 Grade III Pickled sheep pelts of Grade III should have the following qualities: a) defects and damages in the range of 21 % to 40 % of the total area; b) 75 % of the neck and shoulders free from damages. 5.4 Grade IV Pickled sheep pelts of Grade IV should have defects and damages in the range of 41 % to 70 % of the total area. 5.5 Grade V Pickled sheep pelts of Grade V should have defects and damages exceeding 70 % of the total area. 6 Tabular and graphical representation of the classification system Table 1 summarizes the grades according to the location, concentration, depth and surface area of the defects. An explanation of the code numbers used is given in Table 2. 7 Grading on the basis of size 7.1 General Pickled sheep pelts may be graded on the basis...
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