PD ISO TR 02822 — Leather Raw Cattle Hides and Calf Skins Grading Guidelines (ISO/TR 2822 Series)

🐄 PD ISO/TR 2822 is a BSI Published Document implementing ISO/TR 2822 in the UK, developed by Technical Committee TCI/69 (Footwear, leather and coated fabrics). The series revolves around “grading of raw cattle hides and calf skins“, a fundamental commercial activity in the leather industry, providing unified grading guidelines: Part 2 specifies guidelines for grading on the basis of mass, and Part 3 specifies guidelines for grading on the basis of defects. The grading of raw hides directly determines the market price of raw material, its processing route, and the yield of finished leather — a key link connecting animal husbandry, raw material trading, and tanneries in the leather supply chain.

1. Series Background and Positioning 📌

Raw cattle hides and calf skins are the most important raw materials of the tanning industry. The way hides are handled during slaughter, flaying, drying/salt-wetting or freezing for storage, and transport, together with the integrity, area, and defects of the skin itself, determine its commercial value. Historically, different countries and markets have had different practices for grading raw hides, and the lack of a unified standard often led to trade and quality disputes.

ISO/TR 2822 was developed precisely to unify raw hide grading: it provides an internationally applicable set of guidelines for “grading on the basis of mass” and “grading on the basis of defects”, covering trimming, weighing and mass determination, preservation, defect classification, and grade assessment. As a technical report it provides guidance rather than mandatory requirements, but in practice it is often cited in contracts by buyers and sellers. The UK versions are published by BSI as Published Documents.

2. Series File List 📋

The PD ISO/TR 2822 series technical report files covered in this batch are listed below.

3. Grading on the Basis of Mass (Part 2) 🔧

Part 2 focuses on grading methods based on mass (weight), with core content including:

• Trimming: specifies trimming requirements for cattle hides, defining the measurement boundary of the remaining portion when head, tail, hooves, and legs are removed, ensuring a consistent basis for mass determination.
• Determination of mass: gives weighing conditions and calibration requirements, explaining the effect of moisture state (fresh, salt-wet, dried) on mass and the conversion methods.
• Grading intervals: divides grade intervals by the mass of an individual hide, as the basis for commercial trading and processing sorting.
• Assessment flow: specifies the complete working flow from receiving, weighing, recording, to release, ensuring traceability of grading results.

Mass grading is simple, intuitive, and suitable for batch operations, and is widely used in the raw hide trade priced by weight; however, it has limitations — mass cannot reflect hide defects and leather yield, so it is often used together with the defect grading of Part 3.

4. Grading on the Basis of Defects (Part 3) 🔍

Part 3 focuses on the “quality” of hides — grading based on defects, with core content including:

• Trimming and preservation: explains trimming requirements before grading and the effect of preservation treatments such as salting and drying on hide storage quality.
• Defect classification: classifies common defects of raw hides, including pricks/bites, knife cuts, brand marks, ringworm/eczema patches, parasite damage (e.g. warble damage), mechanical damage, and disease-related defects.
• Grade assessment: divides hides into different grades according to the number, location, and severity of defects, giving basic principles and operating requirements for grade assessment.
• Recording and reporting: specifies how defect inspection results are recorded, facilitating judgement and traceability.

Defect grading is closer to the final use: tanneries select appropriate process routes and end uses (shoe upper leather, garment leather, bag leather, etc.) based on the usable area and quality of the grain surface, thereby optimising raw material utilisation.

5. Engineering Practice Applications 🛠️

• Raw hide trading: buyers and sellers grade by mass and defects per ISO/TR 2822 as the basis for price negotiation and acceptance.
• Sorting at tanneries: tanneries sort and store hides by grading results, matching the appropriate process and product positioning.
• Supply chain quality management: build unified grading data from slaughterhouses, traders, to tanneries, tracking raw material quality trends and optimising supplier management.
• Leather yield prediction: combine defect grading to predict finished leather yield and profit margin, supporting purchasing decisions.

A typical implementation flow: receive hides and verify accompanying information → trim and weigh per Part 2 to determine the mass grade → inspect defects per Part 3 and assess the grade → record grading results and issue a grading list → sort, price, and process according to the grading results.

6. Frequently Asked Questions ❓