metal stationary cupboards
1985 Edition

According to IS 6189, metal stationery cupboards should be fabricated from cold-rolled mild steel sheets, typically ranging from 0.8 mm to 1.2 mm in thickness to ensure strength and durability. The sheet surfaces must be thoroughly cleaned and treated with anti-corrosive primers, followed by synthetic enamel or powder coatings for protection. Hardware components such as hinges, locks, and handles are specified to be made of corrosion-resistant materials like stainless steel or brass, guaranteeing longevity and resistance to rust.

IS 6189 outlines that adjustable shelves must incorporate sturdy support systems—such as slots or brackets—that allow height modifications without compromising stability. They should be designed for easy repositioning and withstand stresses from repeated adjustments, often featuring locking mechanisms or markings to prevent accidental displacement. Fixed shelves, on the other hand, are permanently secured at designated heights, prioritizing maximum rigidity and load-bearing capacity without the need for adjustment hardware. Both shelf types must use materials and thicknesses appropriate to their structural roles, complying with load and design specifications.

The standard requires locking devices and latch rods to be constructed from corrosion-resistant materials such as brass or stainless steel to ensure durability. Latch rods must have an adequate diameter and length to securely engage strike plates and feature smooth, rounded ends to facilitate effortless locking and unlocking. The locking system should operate smoothly with minimal effort, potentially utilizing spring-loaded latches or lever handles, ensuring reliable and user-friendly security for cupboard doors.

While IS 6189 emphasizes the importance of corrosion resistance, typical surface treatments include hot-dip galvanizing to apply a protective zinc layer, epoxy coatings to resist moisture and chemical exposure, bituminous coatings for underground applications, and multi-layer paint systems comprising primers and topcoats with anti-corrosive properties. Surfaces must be properly cleaned and prepared before treatment to ensure optimal adhesion and protection. Regular maintenance and inspection further enhance the cupboard’s lifespan.

IS 6189 mandates several performance evaluations to verify cupboard quality, including load tests on shelves to ensure they can support specified static weights without permanent deformation, durability tests involving repeated door opening and closing cycles to assess hinge and lock longevity, corrosion resistance assessments of surface finishes under atmospheric conditions, dimensional accuracy verification against prescribed tolerances, and stability tests to confirm the cupboards do not tip over during normal use. These tests collectively guarantee structural integrity, durability, and functional reliability.