ISO 7482-3:2005

Overview

ISO 7482-3:2005 - Raw goat skins - Part 3: Guidelines for grading on the basis of defects - provides standardized guidance for classifying raw or cured, trimmed goat skins by visually apparent defects. It defines trimming and preservation requirements, groups of defect types, and a four-grade classification (first to fourth) plus rejection criteria to ensure consistent quality assessment across the leather supply chain.

Key topics and technical requirements

• Scope and intent: Applies to raw or cured, trimmed goat skins and supports visual grading prior to tannery processing.
• Trimming requirements: Skins must be presented without head, scrotum, udder, anus or navel; legs cut above knee/hock; short tail; no adhering fat or meat. Bleeding, belly and leg cuts should be centered.
• Accepted preservation methods: drying by hanging in shade, salting, brining, dry-salting and cooling; raw/green skins may also be graded.
• Defect categories: Six groups are defined:
  • Health-related (disease marks, tumours, abscesses)
  • Identification marks (hot-iron brands, paint, freeze-branding)
  • Insect/parasite damage (lice, mange, ticks)
  • Wounds and flaying damage (bruises, cuts, holes, corduroy)
  • Preservation faults (putrefaction, chemical stains, hair slip)
  • Dirt contamination (dung, urine, seeds, sand)
• Grading rules:
  • First grade: No central defects, no putrefaction, essentially clean; only limited peripheral defects allowed.
  • Second grade: Allows certain defects on shoulder/belly, traces of putrefaction and limited dirt at periphery.
  • Third grade: Accepts low/medium concentration of defects in butt (best part); none of the accepted defects may cover more than 25% of total area.
  • Fourth grade: Similar to third but defects may cover up to 40% of skin area.
  • Rejects: Skins exceeding fourth-grade defect limits or with more than 50% unusable area. Also includes fallen skins, untrimmed/poorly trimmed skins, ground or ball-dried skins, and smoked skins.
• Representation: Tabular and graphical representations summarize location, concentration, depth and surface area limits for each grade.

Applications and users

ISO 7482-3:2005 is used by:

• Tanneries and leather manufacturers for intake quality control and processing decisions
• Hide and skin traders, auction houses and procurement teams for consistent pricing and grading
• Quality inspectors and laboratory personnel to standardize defect assessment
• Supply chain managers and product developers to predict yield and leather grades

Practical benefits include consistent grading, improved communication between suppliers and buyers, reduced disputes, and better raw material valuation.

Related standards

• ISO 7482-1: Descriptions of defects (normative reference)
• ISO 7482-2: Guidelines for grading on the basis of mass and size

Keywords: ISO 7482-3:2005, raw goat skins, goatskins grading, defects classification, trimming, preservation, leather industry, hide quality control.