Engineering Drawing Perfection is based on representations Representation of a large object, sentence or action as a sign is called a convention. These conventions have been approved by ISI by IS 696 – 1972
Materials Conventions Representation Symbol According to IS 696 – 1972
| Materials | Convention or Symbol |
|---|---|
| Steel Cast Iron Copper and its alloys Aluminum and its alloys |  |
| Lead Zinc Tin White Metal |  |
| Brass Bronze Gun Metal |  |
| Glass |  |
| Porcelain Stone Ware Marble Slate |  |
| Asbestos Fiber Felt Synthetic Resin Product Paper Cork Linoleum Rubber Leather Wax Insulating and Filling Material |  |
| Wood Plywood |  |
| Earth |  |
| Brick Work Masonry Fire Bricks |  |
| Concrete |  |
| Water Oil Petrol Kerosene |  |
By not writing the name of the cut material on the intersecting surface of the object, it is displayed only in the sign of the substance by its ball.
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