IS 92361993AI Search Enabled✦ AI Generated

Metal letter-rests
1993 Edition

This specification outlines the criteria for metal letter-rests primarily utilized in office environments for the systematic arrangement of documents and correspondence. It details the acceptable materials, dimensions, fabrication techniques, surface finishes, and testing methods for letter-rests fabricated from mild steel and aluminium. The standard serves as a vital reference for manufacturers, distributors, and buyers aiming to procure reliable and standardized metal letter-rests.

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Overview

What This Standard Covers

This specification outlines the criteria for metal letter-rests primarily utilized in office environments for the systematic arrangement of documents and correspondence. It details the acceptable materials, dimensions, fabrication techniques, surface finishes, and testing methods for letter-rests fabricated from mild steel and aluminium. The standard serves as a vital reference for manufacturers, distributors, and buyers aiming to procure reliable and standardized metal letter-rests.

Audience

Who Uses This Standard

  • Manufacturers of office furnishings
  • Engineers overseeing quality assurance
  • Procurement professionals in governmental and corporate sectors
  • Designers specializing in office equipment
  • Experts in welding and metal fabrication
  • Suppliers of stationery and office furniture
  • Officials ensuring adherence to standards

Contents

Key Topics Covered

✓Specifications for mild steel and aluminium sheet materials
✓Fabrication processes including welding, riveting, and bending techniques
✓Dimensional criteria and allowable tolerances
✓Surface treatment procedures such as phosphating and powder coating
✓Finishing processes involving enamel paints and anodizing for aluminium components
✓Mechanical testing including hardness, adhesion, impact resistance, and humidity exposure
✓Identification and marking protocols for metal letter-rests
✓Design considerations for tray spacing and configuration
✓Standards applicable to welding electrodes and filler materials
✓Details purchasers must provide to ensure correct specifications
✓Conformance with related Indian Standards
✓Removal of surface imperfections like burrs and sharp edges

Structure

Table of Contents

1Scope of the Standard
2Referenced Indian Standards
3Material Specifications
4Dimensions and Permissible Variations
5Construction and Durability Requirements
6Methods of Assembly
7Surface Preparation and Finishing Techniques
8Testing Procedures and Criteria
9Information Required from the Purchaser
10Marking and Identification Guidelines
Annex ACompilation of Referenced Indian Standards
Annex BComposition of the Standards Committee

Frequently Asked

Popular Questions About IS 9236

?What are the minimum thickness specifications for steel and aluminium sheets used in metal letter-rests?▼

The minimum thickness for sheets used in metal letter-rests as per the standard are:

  • Steel sheets: A minimum thickness of 0.8 mm is required.
  • Aluminium sheets: Must be at least 1.0 mm thick.

Additional requirements include ensuring sheets are free from burrs, dents, and sharp edges. The top edges of the bottom tray should be bent and pressed to form a knife edge as detailed in the standard's illustrations. Aluminium sheets must comply with IS Designations 31000, 31500, 40800, or 52000 in H2 temper condition according to IS 737:1986.

This ensures durability and safe handling of the letter-rests.

?Which surface treatments and finishes are recommended for corrosion resistance and aesthetic appeal?▼

The standard specifies the following surface treatment and finishing processes to enhance corrosion protection and appearance:

  • After pickling, apply phosphating treatment conforming to Class C of IS 3618:1966 as per IS 6005:1970 to improve corrosion resistance and paint adhesion.
  • Use putty adhering to IS 110:1983 for filling surface imperfections.
  • Apply aluminium primer following IS 5660:1970.
  • Coat with enamel paints compliant with IS 151:1985, IS 2932:1974, or TS 2933:1975 for finishing.
  • Optionally, powder coating on mild steel can be applied as per IS 13871:1993 if requested.
  • Aluminium components may be anodized to a minimum Grade AC 10 according to IS 1868:1982 for enhanced corrosion and wear resistance.

This sequence ensures both durability and an attractive finish.

?What welding techniques and standards are applicable when assembling metal letter-rest components?▼

According to the standard, assembly of metal letter-rests can involve joining parts by welding, bending for interlocking, or riveting. The welding methods and corresponding Indian Standards include:

  • Gas welding: IS 1323 : 1982
  • Arc welding: IS 816 : 1969
  • Spot welding: IS 819 : 1957
  • Welding of aluminium components must conform to IS 2812 : 1964.

Adhering to these standards ensures strong, reliable, and quality welds in letter-rest construction.

?How are mechanical properties such as hardness and impact resistance evaluated according to this standard?▼

Mechanical property testing is conducted in line with the IS 101 (Part 5) series (1988):

  • Hardness testing (Clause 8.1.1) follows IS 101 (Part 5/Sec 1):1988, which outlines methods for assessing surface hardness of coatings.
  • Flexibility and adhesion tests (Clause 8.1.2) are performed as per IS 101 (Part 5/Sec 2):1988 to evaluate coating pliability and bonding strength.
  • Impact resistance (Clause 8.1.3) is tested following IS 101 (Part 5/Sec 3):1988, determining the coating's ability to withstand sudden forces without damage.

These tests confirm that coatings on metal letter-rests meet durability and performance standards.

?What details must a purchaser provide when ordering metal letter-rests to comply with the standard?▼

To ensure conformity with the standard, purchasers should specify:

  • The desired finish colour.
  • Any alternative construction or finishing options, if applicable.
  • The number of trays required, with the minimum spacing between trays being 65 mm as per the standard.

Providing these details facilitates proper manufacturing and quality assurance in line with IS 9236 requirements.

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