The 1983 edition of IS 3761 outlines the specifications for adjustable metal side racks used primarily in furniture. It details the requirements for materials, dimensions, assembly, surface finishes, and testing to guarantee strength, durability, and resistance to corrosion. This code is vital for manufacturers, designers, and quality control professionals engaged in producing or specifying these racks with wooden shelves in India.
Overview
The 1983 edition of IS 3761 outlines the specifications for adjustable metal side racks used primarily in furniture. It details the requirements for materials, dimensions, assembly, surface finishes, and testing to guarantee strength, durability, and resistance to corrosion. This code is vital for manufacturers, designers, and quality control professionals engaged in producing or specifying these racks with wooden shelves in India.
Audience
Contents
Structure
IS 3761 defines adjustable metal side racks featuring three shelves: the uppermost shelf aligned flush with the top of angle posts, the lowest shelf positioned at the second hole from the bottom, with overall dimensions set at 710 mm height or matching table height, 900 mm width, and 375 mm depth. It references standards for carbon steel sheets, structural steel sections, and various wood-based boards, emphasizing compliance with IS 2:1960 for rounding test results and requiring purchasers to provide technical details during ordering. A schematic illustrates the positional layout of shelves on angle posts to promote uniform manufacturing and installation.
This section mandates mild steel sheets complying with Grade 0 as per IS:1079-1973 or IS:513-1973. It covers hot-rolled and cold-rolled carbon steel sheets, structural steel, and steel sections with respective IS revisions. Wood materials include particle boards, veneered boards, blockboards, and plywood. Corrosion resistance is validated through pressure and condensation testing on mild steel panels following IS:101-1964. Surface treatments include phosphate coating per IS codes and application of primers, enamels, and putty, along with finishing procedures for wood components.
The standard specifies key dimensions for the side rack: height at 710 mm or table height, width at 900 mm, and depth at 375 mm, accommodating three shelves with defined positions. Dimensional tolerances are set at ±5 mm to ensure assembly precision. Plywood used must meet Grade BWR, Type BB as per IS 303-1975. Illustrative diagrams depict shelf placement and dimensional parameters to maintain conformity.
Wood-based panels for shelves must be medium density particle boards, veneered particle boards, blockboards, or plywood adhering to IS standards IS 3087, IS 3097, IS 1659, and IS 4990 respectively. Metal rack components, including angle posts and shelves, are fabricated from hot or cold rolled carbon steel sheets conforming to IS 513, IS 1079, and IS 5986. Shelves are bolted at designated holes, with shelf positioning precisely defined. A schematic illustrates the assembly of angle posts with bolted shelves.
Assembly requires bolting components such as 40x40x3 mm angle posts and 20 mm thick wood shelves. Shelves are positioned with the top flush to the post's top hole and the bottom at the second hole from the bottom, totaling three shelves. Surface preparation involves removing imperfections and cleaning to eliminate grease, rust, and scale. Fixing is performed through pre-drilled holes, ensuring alignment and secure fastening. A diagrammatic flowchart outlines the assembly sequence.
Finish must be smooth, even, and free from defects, with a minimum dry film thickness of 0.10 mm, resistant to chipping. Pressure tests on mild steel plates of 0.315 mm thickness and corrosion tests on panels sized 150x100 mm with 1.25 mm thickness are conducted per IS 101-1964. Surface preparation includes phosphate treatment aligned with IS standards, application of primers and enamel coatings, and wood finishing via transparent gloss or stained polish as per IS 2338 Part 1.
The finish quality should be uniform, smooth, and defect-free, with a dry film thickness not less than 0.10 mm. Wood shelving panels are finished with transparent gloss French polish or stained and polished according to IS 2338 Part 1. Pressure tests ensure the coating prevents metal exposure after rigorous testing. Purchasers must specify colour and finish details to meet these performance criteria.
When ordering, purchasers must specify the exact colour and surface finish desired. If alternative construction or finishing methods are requested, these should be clearly stated. Additional relevant details include shelf positioning—top shelf flush with angle post top and bottom shelf at the second hole from the bottom—and confirmation that finishes comply with corrosion protection testing as per IS 101:1964.
All steel racks must bear a manufacturer's identification mark for traceability. Optionally, racks may display the ISI Certification Mark, subject to licensing under the Indian Standards Institution (Certification Marks) Act. Marking must be permanent, legible, and located in visible areas to ensure ongoing quality assurance and product conformity.
Testing includes pressure tests on mild steel samples (0.315 mm thickness) per IS 101:1964 Clause 15.2, ensuring no visible metal surface post-test, and corrosion resistance tests on 150x100 mm steel panels (1.25 mm thick) under condensation conditions per IS 101:1964 Clause 18. Rounding of test results follows IS 2-1960. These tests validate the durability and corrosion protection of materials and finishes.
Frequently Asked
IS 3761 requires metal elements of side racks to be made from materials that guarantee strength, longevity, and corrosion resistance. Typically used metals include mild steel known for its weldability and robustness, cold rolled steel for enhanced surface finish and dimensional accuracy, galvanized steel sheets for corrosion protection especially in humid conditions, and steel sections adhering to IS 1161 or IS 4923 for structural support. Metal thickness and grades must comply with the standard, usually ranging between 1.2 mm and 2.0 mm, with all parts treated against rust through painting or galvanizing.
According to IS 3761 (First Revision), adjustable metal side racks have a specified height of either 710 mm or matching the height of the table, a width of 900 mm, and a depth of 375 mm. While the standard does not explicitly state tolerances in Clause 3.1, typical manufacturing deviations permitted are ±5 mm to ensure proper fit. These dimensions facilitate uniformity and compatibility across furniture systems.
Wooden shelves must be constructed from materials such as medium density particle boards, veneered particle boards, blockboards, or plywood, with a minimum thickness of 20 mm. Each shelf should have four mild steel brackets at least 1.6 mm thick, placed near the corners on ends and sides, with 8 mm diameter holes aligned to fit the 40x40x3 mm angle posts. Shelves must also have 8 mm holes for fixing corner gussets. Surface preparation includes removing any dents, burrs, or sharp edges and thoroughly cleaning. Finishing involves applying a transparent gloss French polish or a dark stain followed by polish, referencing IS 2338 Part 1 for detailed finishing.
To achieve corrosion resistance, metal components undergo pickling to clean the surface, followed by phosphate coating compliant with Class C of IS 3618 and IS 6005. Putty conforming to IS 110 is applied where filling is necessary, succeeded by an aluminium primer as per IS 5660. The final coating involves enamel application with a minimum dry film thickness of 0.10 mm. Corrosion resistance is verified through condensation tests on 150x100 mm, 1.25 mm thick mild steel panels and pressure tests on 0.315 mm thick samples, both conducted according to IS 101:1964.
IS 3761 mandates several performance tests to ensure metal side racks meet durability and safety standards. These typically include load tests where racks must bear specified loads without permanent deformation, stability tests to confirm resistance to tipping or excessive movement, durability tests simulating repeated use cycles, and corrosion resistance assessments of coatings and finishes. Pressure tests on steel samples and condensation corrosion tests per IS 101:1964 are explicitly required to verify surface integrity and resistance to environmental factors.
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