metal chairs for office purposes Specification, Part 2: Revolving and tilting (BI-LINGUAL)
1985 Edition

Overview of Scope & Material Requirements

• Scope: Addresses metal chairs constructed from materials such as wrought aluminium, steel tubing, and furniture-grade wood (referencing IS 399:1963).

• Material Details:

  • Wood: Compliant with IS 399:1963 for commercial timber classification.
  • Aluminium Tubes: Must meet the standards IS 1285:1975 covering designations 62400, 63400, and 65032.
  • Steel: Includes cold rolled and hot rolled carbon steel sheets alongside steel tubing suitable for furniture.

• Welding Standards: Welding processes must follow:

  • Gas welding as per IS 1323:1966
  • Arc welding as per IS 816:1969
  • Spot welding as per IS 819:1957

• Marking: Chairs may carry the BIS Standard Mark under Clause 10.2, ensuring adherence to quality and regulatory compliance.

Aluminium Tube Designations Reference (IS 1285:1975)

Welding Codes Summary

This section ensures that materials and manufacturing techniques comply with rigorous quality and safety standards for metal furniture production.

Detailed Material Specifications

Wood for Furniture (Clause 2.8)

• Usage of wood conforming to IS 399:1963.
• Classification of commercial timber including zone distributions.
• Wood must be well-seasoned, defect-free, and durable.

Mild Steel Sheets (Clause 2.5)

• Use Grade 0 steel sheets as per:
  • IS 513:1973 (Cold Rolled Carbon Steel Sheets)
  • IS 1079:1973 (Hot Rolled Carbon Steel Sheets)

Aluminium Tubes (Clause 2.1)

• Aluminium tubes to comply with IS 1285:1975, designations 62400, 63400, or 65032.
• Typically extruded round or hollow profiles for engineering use.

Welding Materials

• Filler rods and wires for gas welding matching IS specs.
• Covered electrodes for metal arc welding as per IS 814 (Part 1).
• Resistance spot welding electrodes conforming to IS 819:1957.

Material Standards Summary

Specific mechanical and dimensional data can be provided upon request.

Key Dimension Requirements for Chairs

• Clause 3.1.4: Minimum Overall Size

  • Height: Minimum 785 mm
  • Width (including armrests): Minimum 535 mm

• Detailed dimensions including seat height, depth, and backrest height are specified in clauses 3.1.1 through 3.1.4.

• Material standards:

  • Wood per IS 399:1963
  • Aluminium tubing meeting IS 1285:1975 (designations 62400, 63400, 65032)
  • Steel tubing as per IS 1161
  • Screws, electrodes, and finishing materials as per relevant IS codes

Summary Table of Minimum Dimensions (Clause 3.1.4)

Notes:

• For granular dimensional details such as seat depth and backrest angle, consult clauses 3.1.1 to 3.1.3.
• Use materials conforming to Indian Standards to maintain durability and compliance.

flowchart TD
    Chair[Chair Dimensions] --> Height[Height: 785 mm]
    Chair --> Width[Width: 535 mm]
    Chair --> Materials[Material Specs]
    Materials --> Wood[Wood: IS 399:1963]
    Materials --> Aluminium[Aluminium Tubes: IS 1285:1975]
    Materials --> Steel[Steel Tubes: IS 1161]

This ensures ergonomic, standardized chair design adhering to IS 3499.

Construction Requirements and Reference Standards

Material Requirements:

• Furniture-grade wood per IS 399:1963.
• Aluminium tubes meeting IS 1285:1975 (designations 62400, 63400, 65032).
• Steel tubes conforming to IS 7138:1973.
• Cold rolled and hot rolled carbon steel sheets as specified.
• Welding materials include gas welding rods, covered electrodes for metal arc welding (IS 814 Part 1), and resistance spot welding electrodes (IS 819:1957).

Welding Standards:

• Gas welding: IS 1323:1966
• Arc welding: IS 816:1969
• Spot welding: IS 819:1957

Additional Elements:

• Wood finishing with French polish and paste.
• Use of slotted countersunk head screws as per standard.
• Timber classification and zonal distribution in accordance with IS 399.

Construction Material Standards Summary

These standards assure quality in materials and welding integrity in chair fabrication under IS 3499.

Assembly Requirements and Material Specifications

Materials:

• Wood per IS 399:1963.
• Metal components include steel tubular pipes and aluminium tubes.
• Steel tubes must have a minimum wall thickness of 1.60 mm.
• Aluminium tubes require a minimum wall thickness of 2.0 mm.
• Steel sheets should be not less than 1.0 mm thick.

Base Frame (Clause 4.1):

• Minimum of four legs required.
• Tubular pipes may be round or square:
  • Round tubes: Outside diameter at least 25 mm.
  • Square tubes: Side length at least 20 mm.

Assembly Methods (Clause 5.1):

• Components to be joined by welding, bolting, or screwing.

Welding and Fastening:

• Welding electrodes and filler rods must comply with relevant IS specifications.
• Screws should be slotted countersunk head types as defined by IS codes.

Metal Tubular Components Summary

graph TD
    BaseFrame[Base Frame] --> Legs[Minimum 4 Legs]
    Legs --> TubeShape{Tube Shape}
    TubeShape --> Round[Round Tubes]
    TubeShape --> Square[Square Tubes]
    Round --> SteelRound[Steel: Ø ≥ 25 mm, t ≥ 1.6 mm]
    Round --> AluminiumRound[Aluminium: t ≥ 2.0 mm]
    Square --> SteelSquare[Steel: side ≥ 20 mm, t ≥ 1.6 mm]
    Square --> AluminiumSquare[Aluminium: t ≥ 2.0 mm]
    BaseFrame --> Assembly[Assembly Methods]
    Assembly --> Welding[Welding]
    Assembly --> Bolting[Bolting]
    Assembly --> Screwing[Screwing]

This summary captures principal assembly criteria for metal chair fabrication under IS 3499.

Finishing Requirements and Standards

Wood Components (Clause 2.8):

• Use furniture-grade wood complying with IS 399:1963.

Paint and Enamel Coatings (Clause 6.1.3):

• Enamel paint finishing coats should align with IS 151:1950, IS 2932:1974, or IS 2933:1975.

Wooden Arm Finishing (Clause 6.3):

• Polish with wax polish, transparent glossy French polish (IS 348:1968), or stain and lacquer per purchaser's request.

French Polish (Clause 2.3):

• Must meet IS 348:1968 specifications.

Finishing Specification Summary

Additional Details:

• Proper surface preparation is essential before applying finishes.
• Multiple enamel coats improve durability and aesthetic appeal.
• French polish provides a glossy, transparent finish ideal for wooden parts.

flowchart TD
    WoodSelection -->|IS 399:1963| SurfacePrep[Surface Preparation]
    SurfacePrep --> EnamelCoat[Apply Enamel Paint]
    EnamelCoat -->|IS 151/2932/2933| FinishCoat[Finish Coat]
    SurfacePrep --> WoodenArms[Wooden Arms]
    WoodenArms -->|Wax/French Polish (IS 348)| FinalPolish[Final Polish]

These guidelines ensure finishing quality as per IS 3499.

Summary of Performance Requirements and Testing

Pressure Testing (Clause 7.2):

• Metal tubes and joints must undergo pressure tests simulating service loads to verify structural soundness.
• Specific pressure levels and durations are defined in IS 3499 Clause 7.2.

Material Compliance:

• Wood as per IS 399:1963.
• Metal components including wrought aluminium, alloy, cold and hot rolled steels, and steel tubing.
• Welding processes must adhere to IS 1323:1966 (gas), IS 816:1969 (arc), and IS 819:1957 (spot).

Marking (Clause 10.2):

• Chairs may carry the BIS Standard Mark, certifying compliance and quality assurance under BIS supervision.

Example Table for Testing Dimensions (Clause 10.2)

Testing and Production Flow Diagram

flowchart LR
    Materials[Material Selection] --> Welding[Welding (IS 1323, 816, 819)]
    Welding --> Assembly[Assembly]
    Assembly --> PressureTest[Pressure Test (Clause 7.2)]
    PressureTest --> Marking[Marking & Quality Control (Clause 10.2)]
    Marking --> FinishedProduct[Final Product]

For precise test pressures, timings, and parameters, consult the full IS 3499 text and referenced standards.

Packaging Guidelines for Metal Chair Components

• Clause 8.1: Ensure all parts are packed securely to prevent damage during transportation. Packaging must protect against mechanical shocks, moisture ingress, and corrosion.

• Materials for Packaging:

  • Use furniture-grade wood per IS 399:1963.
  • Aluminium tubes conforming to IS 1285:1975 (designations 62400, 63400, 65032).
  • Welding for assembly parts to follow IS 1323, IS 816, and IS 819.

Packaging Summary Table

Packaging Best Practices:

• Employ cushioning materials such as polyethylene foam to absorb shocks.
• Protect metal components against moisture and corrosion using appropriate coatings or wrapping.
• Secure fastening inside packaging to prevent movement.

flowchart LR
    Components --> Packaging[Packaging]
    Packaging --> WoodenCrates[Wooden Crates (IS 399)]
    Packaging --> AluminiumTubes[Aluminium Tubes (IS 1285)]
    Packaging --> ProtectiveWrapping[Protective Wrapping]
    ProtectiveWrapping --> MoistureBarrier[Moisture Barrier]
    ProtectiveWrapping --> ShockAbsorbers[Shock Absorbers]
    Packaging --> Welding[Welding Methods (IS 1323, 816, 819)]

This approach ensures compliance with IS 3499 and protects parts throughout transit.

Details to be Provided by Purchaser According to Clause 9

To facilitate accurate manufacturing and fulfillment, purchasers should specify:

• Seat Type: Fixed, swivel, or cushioned options.
• Backrest Type: Fixed, adjustable, or cushioned variants.
• Castor Unit: Indicate necessity and type (fixed, swivel, with brakes).
• Finish Colour: Natural wood, painted, anodized aluminium, etc.
• Alternative Construction or Finishing Methods: If any preferred.

Additional Relevant Specifications:

• Furniture wood complying with IS 399:1963.
• Aluminium parts may be anodized per purchaser’s instructions (Clause 6.2).
• Steel and welding materials as per applicable IS standards.
• Steel tubes for furniture as specified by IS.

Packaging Note:

• All components must be packed to prevent damage during shipment as per Clause 8.1.

Purchaser Information Summary Table

flowchart TD
    OrderReceived[Purchaser places order] --> SeatType[Provides seat type]
    SeatType --> BackType[Specifies backrest type]
    BackType --> Castor[Specifies castor unit]
    Castor --> FinishColour[Specifies finish colour]
    FinishColour --> Alternatives[Specifies alternative methods]
    Alternatives --> Manufacture[Supplier manufactures accordingly]
    Manufacture --> Packaging[Components packed securely]

This ensures clarity and conformity to IS 3499 requirements.

Marking Requirements for Metal Office Chairs

Main Clauses:

• Clause 10.1: Every metal chair must carry a mark identifying the manufacturer.

• Clause 10.2: Chairs may optionally bear the BIS Standard Mark, demonstrating compliance with Indian Standards under BIS quality supervision.

Important Considerations Regarding the Standard Mark:

• Its use is governed by the Bureau of Indian Standards Act, 1986.
• The mark reflects production under strict inspection, testing, and quality control systems.
• Continuous monitoring by BIS ensures ongoing conformity.
• Licensing details for using the Standard Mark are available from BIS.

Marking Dimensions Table (Clause 10.2)

This likely indicates specified sizes for identification marks.

Additional References:

• Wood per IS 399:1963.
• Welding methods must comply with IS 1323:1966 (gas), IS 816:1969 (arc), and IS 819:1957 (spot).

Summary:

• Manufacturer identification marking is mandatory on all metal chairs.
• The BIS Standard Mark is optional but signifies assured compliance.
• Usage of the Standard Mark requires adherence to BIS licensing conditions.
• Marking sizes range from 10 mm to 100 mm as per guidelines.
• Material and welding specifications must conform with referenced IS standards.

Visual aids or process flows for marking can be developed if required.