Criteria of classifying materials
- Based on the coding of materials
- Coding by the end used
- Color marking
- Technical affinities
Based on the coding of materials
This involves the consideration of materials by reference to their own inherent characteristics. The first stage is to collect similar items into a series of main group such as raw materials body parts etc.
Coding by the end use
This means arranging the codes to correspond with the purpose for which the various items are eventually employed.
Code numbers are at time supplemented by colour marking on the various materials or part of the material.