The standard IS 7076:1983 outlines the specifications for metal bookends crafted from mild steel or aluminum sheets. It covers essential aspects such as material properties, dimensions, fabrication techniques, surface finishing, and quality tests to ensure the production of sturdy, corrosion-resistant, and well-finished bookends suitable for both office and residential environments.
Overview
The standard IS 7076:1983 outlines the specifications for metal bookends crafted from mild steel or aluminum sheets. It covers essential aspects such as material properties, dimensions, fabrication techniques, surface finishing, and quality tests to ensure the production of sturdy, corrosion-resistant, and well-finished bookends suitable for both office and residential environments.
Audience
Contents
Structure
This section covers specifications for mild steel sheets intended for phosphating and painting as per IS standards. It includes material grades, dimensions, and testing requirements including flexibility and adhesion tests on sample sizes of 150 mm by 50 mm with 0.315 mm thickness, conducted according to IS 101:1964. Rounding off of test values follows IS 2:1960 guidelines.
Details the requirements for mild steel sheets conforming to Grade 0 of IS 513:1973 or IS 1079:1973, and aluminum sheets meeting Grades 31000 or 52000 of IS 737:1974 in H condition. Specifies minimum thicknesses and surface quality, along with paint adhesion and flexibility testing to ensure durability.
Defines minimum thicknesses for steel (≥1.6 mm) and aluminum (≥2.0 mm) sheets, referencing schematic dimensions provided in the standard. Allows for purchaser and manufacturer agreement on alternative shapes and stresses the importance of burr-free, dent-free surfaces.
Specifies the use of cold or hot rolled carbon steel sheets meeting designated IS grades, and aluminum sheets of specified thickness. Emphasizes manufacturing precision, absence of surface defects, and adherence to rounding conventions for test data.
Outlines procedures including removal of surface imperfections, pickling, and phosphating treatment following IS 3618 and IS 6005. Specifies putty usage for surface filling and requirements for aluminum primers and paint coatings. Includes tests for flexibility, adhesion, and corrosion resistance.
Describes finish requirements such as anodizing of aluminum to Grade AC 15 (IS 1868) and enamel coatings conforming to relevant IS standards. Details testing protocols for paint flexibility and adhesion ensuring no damage or cracking under magnification.
Lists information that buyers must provide when ordering, including precise color, finish, and any acceptable variations in shape or finish. Emphasizes ensuring clarity to meet quality and specification demands.
Declares the necessity for manufacturer identification marks on bookends and the optional application of the ISI certification mark under regulatory provisions. Specifies that markings should be clear, durable, and legible.
Details testing methods including flexibility and adhesion tests on mild steel samples, with acceptance criteria of no film damage under 10x magnification. Covers adherence to IS standards for paint and enamel tests and guidance on rounding off test results.
Frequently Asked
As specified in IS 7076, metal bookends require minimum sheet thicknesses of 1.6 mm for mild steel and 2.0 mm for aluminum. The sheets must be free from burrs and dents and comply with the relevant IS standards for cold or hot rolled carbon steel, ensuring sufficient strength and durability for effective book support.
IS 7076 mandates phosphating treatment immediately following pickling for mild steel components, conforming to Class C of IS 3618 and applied as per IS 6005. Aluminum parts may receive anodic coatings per Grade AC 15 of IS 1868. Paint coatings use primers such as aluminum red oxide per IS 5660, along with ready-mixed paints and enamels meeting IS testing standards. These combined treatments provide enhanced corrosion resistance and paint adhesion.
The scratch hardness test involves using a mild steel plate sample sized 150 mm by 50 mm with 0.315 mm thickness, finished as per the standard. The test follows Clause 15.1 of IS 101:1964, where the surface is scratched, and the finish must show no exposure of bare metal. This ensures the coating’s resistance to surface damage.
Aluminum bookends may be anodized if specified by the purchaser. The anodic coating must meet Grade AC 15 per IS 1868, ensuring a minimum thickness (typically no less than 15 microns) and providing enhanced corrosion protection and durability. This treatment is optional but adheres to the standard’s quality requirements.
Purchasers should specify the color and finish, any acceptable alternative shapes or finishes, the type of material and thickness, quantity required, and any special features such as load capacity. Providing these details ensures that manufacturers produce bookends that meet functional and aesthetic requirements per the standard.
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