metal waste paper bins - Specification
1979 Edition

The standard specifies the use of mild steel or aluminum sheets meeting designated Indian Standards. Mild steel sheets are generally used with thicknesses ranging approximately from 0.8 to 1.2 mm with finishes such as enamel paint or powder coating for corrosion protection. Aluminum sheets also conform to specified designations in the H2 temper condition, often finished with anodizing or primers to enhance durability and appearance. The materials must comply with thickness and surface quality requirements to ensure strength and longevity.

The standard defines the typical dimensions of metal waste paper bins as a height of 300 mm, a minimum top square opening of 250 mm, and a minimum bottom square opening of 200 mm. Dimensional tolerances are generally ±5 mm for height and ±3 mm for the top and bottom openings. These measurements ensure uniformity and facilitate practical usage in office and institutional environments.

For fabrication, the standard recommends welding techniques including gas welding (as per IS 1323), metal arc welding (IS 816), and resistance spot welding (IS 819). Electrodes and filler rods must conform to relevant IS codes such as IS 1278 for gas welding electrodes, IS 814 Part II for metal arc welding electrodes, and IS 4972 for spot welding electrodes. Aluminum components are welded according to IS 2812. Proper surface preparation through removal of burrs and pickling is mandatory to ensure strong, defect-free welds.

Following surface preparation which includes dent and burr removal and pickling to eliminate grease and rust, a phosphate treatment conforming to Class C of IS 3618 is applied. This phosphate layer enhances paint adhesion and corrosion protection. Subsequently, putty filling (IS 426) is performed where necessary, followed by application of an aluminum primer (IS 2931). The final coating consists of enamel or ready-mixed paints complying with relevant IS standards. Finished products undergo pressure, adhesion, and flexibility tests to verify durability against corrosion and mechanical damage.

Performance testing involves subjecting mild steel samples (0.315 mm thick) to pressure tests to verify coating integrity. Additional assessments include adhesion and flexibility tests of paint films, and corrosion resistance evaluations under simulated condensation conditions. Structural strength is checked through load testing, while dimensional accuracy and welding quality are also inspected. These tests ensure that the bins meet functional requirements for durability, safety, and longevity in their intended environments.