metal chairs for office purposes Specification, Part 1: Non-revolving and non-tilting

IS 3499 Part 1 - Scope: Key Specifications

• Material: Aluminium tubes conforming to IS : 1285-1975 (Designation HV 20 WP) or equivalent with:

  • Tensile Strength (Min): 26 kgf/mm²
  • Elongation (Min) on 50 mm: 16%

• Aluminium Tubular Frame (Clause 5.1.1):

  • Wall Thickness: ≥ 1.60 mm
  • Shape: Round or square tubes
  • Dimensions:
    • Round tube outside diameter ≥ 25 mm
    • Square tube side length ≥ 20 mm

• Classification of Metal Chairs (Clause 4.1):

  • With or without arms
  • Different types of seats and backs

Summary Table: Aluminium Tubular Frame Dimensions

flowchart LR
    A[IS 3499 Part 1 Scope] --> B[Material: Aluminium Tubes]
    B --> C[Tensile Strength ≥ 26 kgf/mm²]
    B --> D[Elongation ≥ 16% on 50 mm]
    A --> E[Aluminium Tubular Frame]
    E --> F[Wall Thickness ≥ 1.60 mm]
    E --> G[Round Tube: OD ≥ 25 mm]
    E --> H[Square Tube: Side ≥ 20 mm]
    A --> I[Chair Classification]
    I --> J[With/Without Arms]
    I --> K[Various Seats & Backs]

This scope ensures structural adequacy and standardization for aluminium tubular frames and chair classifications under IS 3499 Part 1.

IS 3499 Part 1 - Materials Key Specifications

1. Aluminium Tubes (Clause 2.7)

• Must conform to IS : 1285-1975, Designation HV 20 WP.
• Alternative aluminium tubes allowed if meeting:

2. Mild Steel Sheets (Clause 2.5)

• Shall conform to:
  • Grade 0 of IS : 513-1973 or
  • Grade 0 of IS : 1079-1973

3. Studs for Chairs (Clause 5.4)

• Made of rubber or suitable material.

Additional Notes:

• Metal chairs classified by type (Clause 4.1):
  • With/without arms
  • Different seat and back types

Summary Table for Materials:

flowchart TD
    A[Materials for Chairs] --> B[Aluminium Tubes]
    A --> C[Mild Steel Sheets]
    A --> D[Studs]
    B --> B1[Tensile ≥ 26 kgf/mm²]
    B --> B2[Elongation ≥ 16%]
    C --> C1[Grade 0 IS 513 or IS 1079]
    D --> D1[Rubber or Suitable Material]

This concise summary covers key material requirements per IS 3499 Part 1.

IS 3499 Part 1 (1985): Key Dimensions & Specifications for Metal Chairs

• Dimensions: As per Clause 3.1, metal chair dimensions must conform to IS 3663-1981 (Dimensions for metal chairs).

• Material Specifications:

  • Aluminium tubes should comply with IS 1285-1975 (HV 20 WP designation).
  • Mechanical Properties of Aluminium Tubes:
    • Minimum Tensile Strength: 26 kgf/mm²
    • Minimum Elongation on 50 mm: 16%

• Classification of Metal Chairs (Clause 4.1):

  • With or without arms
  • Different seat and back types

Summary Table: Aluminium Tube Mechanical Properties

Reference for Dimensions:

• Check IS 3663-1981 for detailed chair dimensions such as seat height, width, backrest height, armrest height, etc.

flowchart TD
    A[Metal Chairs IS 3499 Part 1] --> B[Dimensions as per IS 3663-1981]
    A --> C[Material: Aluminium Tubes IS 1285-1975]
    C --> D[Tensile Strength ≥ 26 kgf/mm²]
    C --> E[Elongation ≥ 16% on 50 mm]
    A --> F[Chair Types]
    F --> G[With Arms]
    F --> H[Without Arms]
    F --> I[Different Seat/Back Types]

For exact dimensional tables, refer directly to IS 3663-1981.

IS 3499 Part 1 (1985) – Performance Requirements of Finish

Key Specifications:

• Wooden Arms Finish (Clause 7.2):

  • Polish with wax, transparent glossy French polish, or stain dark + polish/lacquer as per purchaser's choice.

• Enamel Paint Finish (Clause 7.1.3):

  • Use enamels conforming to IS: 151-1950, IS: 2932-1974, or IS: 2933-1975.
  • For stoving enamel, bake at specified temperature for a smooth, hard, tough film.

Performance Tests:

• Flexibility and Adhesion Test (Clause 8.3):
  • Test sample: Mild steel plate 150 × 50 mm, thickness 0.315 mm.
  • Test as per IS 101-1964 (Clause 16).
  • Criteria: No damage, detachment, or cracking under ×10 magnification.

Order Information (Clause 10.1):

• Purchaser must specify:
  • Type of finish
  • Colour and finish
  • Alternative construction/finish methods if any

Summary Table: Flexibility & Adhesion Test Sample

flowchart TD
    A[Order Placement] --> B{Specify Finish Details}
    B -->|Type| C[Wooden arms / Steel components]
    B -->|Colour & Finish| D[Polish / Enamel paint]
    B -->|Alternative Methods| E[Specify clearly]
    C --> F[Apply finish as per Clause 7.2]
    D --> G[Apply enamel paint per Clause 7.1.3]
    G --> H[Conduct Flexibility & Adhesion Test (Clause 8.3)]
    H --> I{Pass Test?}
    I -->|Yes| J[Accept Finish]
    I -->|No| K[Reject / Refinish]

This ensures durable, aesthetically acceptable finishes conforming to IS

IS 3499 Part 1 — Key Specifications for Components of Metal Chairs

1. Metal Components (Clause 7.1)

• Metal parts must conform to relevant IS standards.
• Aluminium tubes should follow IS:1285-1975 (Designation HV 20 WP).
• Mechanical Properties of Aluminium Tubes:

2. Classification of Metal Chairs (Clause 4.1)

• Chairs are classified by:
  • Presence or absence of arms.
  • Types of seats and backs.

3. Components Assembly (Clause 5.0)

• Metal chairs are assembled from components listed in Clauses 5.1 to 5.3 (not detailed here but typically include legs, seat frame, backrest, arms).

Summary Table for Aluminium Tubes:

Notes:

• Welding electrodes and filler rods must comply with relevant IS welding standards.
• Steel components should conform to IS standards for cold/hot rolled steel sheets and structural steel tubes.

flowchart TD
    A[Metal Chair] --> B[Metal Components]
    B --> C[Aluminium Tubes (IS:1285)]
    B --> D[Steel Components (IS Standards)]
    A --> E[Classification]
    E --> F[With Arms]
    E --> G[Without Arms]
    E --> H[Different Seat/Back Types]
    A --> I[Assembly Components]
    I --> J[Legs]
    I --> K[Seat Frame]
    I --> L[Backrest]
    I --> M[Arms]

This concise overview covers key materials and classification as per IS 3499 Part 1. For detailed dimensions and component specs, refer to clauses 5.1–5.3 and related IS codes.

Assembly of Metal Chairs (IS 3499 Part 1 - 1985)

Key Points:

• Classification (Clause 4.1):

  • Chairs with/without arms
  • Different seat and back types

• Materials (Clause 2.7):

  • Aluminium tubes per IS:1285-1975 (HV 20 WP)
  • Mechanical properties:
    • Tensile Strength (Min): 26 kgf/mm²
    • Elongation (Min) on 50 mm: 16%

• Components (Clause 5.0):

  • Metal chairs assembled from specified components (5.1 to 5.3)

• Assembly Methods (Clause 6.1):

  • Welding (gas, arc, resistance spot)
  • Bolting

Welding & Bolting Specifications

Assembly Flow (simplified)

flowchart LR
    A[Components (5.1 to 5.3)] --> B{Assembly Method}
    B -->|Welding| C[Gas/Arc/Spot Welding]
    B -->|Bolting| D[Bolted Joints]
    C --> E[Final Metal Chair Assembly]
    D --> E

Summary: Use aluminium tubes per IS 1285 with specified mechanical properties. Assemble components by welding (per relevant IS standards) or bolting as per Clause 6.1. Ensure compliance with material and welding specifications for durability and safety.

IS 3499 Part 1 - Metal Components Preparation and Finishing

Key Specifications & Process (Clause 7.1 Series)

• Surface Preparation (7.1.1):

  • Remove dents, burrs, sharp edges.
  • Clean by pickling, scrubbing, and rinsing to remove grease, rust, scale.

• Phosphating Treatment (7.1.2):

  • Apply immediately after pickling.
  • Use Class C phosphate coating as per IS 3618-1966.
  • Follow application process in IS 6005-1970.
  • Use putty (IS 110-1968) for filling surfaces.
  • Aluminium primer per IS 5660-1970.

• Painting (7.1.3):

  • Apply enamel paint conforming to IS 151-1950, IS 2932-1974, or IS 2933-1975.
  • For stoving enamels, bake at specified temperature for a hard, uniform finish.

Summary Table for Metal Component Finishing

flowchart TD
    A[Metal Components] --> B[Remove dents, burrs, sharp edges]
    B --> C[Pickling, scrubbing, rinsing]
    C --> D[Phosphating Treatment (Class C)]
    D --> E[Putty filling]
    E --> F[Apply Aluminium Primer (if aluminium)]
    F --> G[Apply Enamel Paint Coats]
    G --> H{Stoving enamel?}
    H -- Yes -->

IS 3499 Part 1: Key Test Specifications

1. Pressure Test (Clause 8.2)

• Sample: Mild steel plate, thickness = 0.315 mm, prepared as per Clause 7.
• Standard: Conducted as per IS 101:1964, Clause 15.2.
• Requirement: No visible metal surface exposure after test (no rupture or pinholes).

2. Flexibility and Adhesion Test (Clause 8.3)

• Sample: Mild steel plate, size = 150 × 50 mm, thickness = 0.315 mm.
• Standard: As per IS 101:1964, Clause 16.
• Acceptance: Paint film must show no damage, detachment, or cracking under ×10 magnification after bending.

3. Material Properties for Aluminium Tubes (Clause 2.7)

• Aluminium tubes conform to IS 1285-1975 (HV 20 WP) or equivalent.

Summary Table for Tests

flowchart TD
    A[Sample Preparation] --> B[Pressure Test - IS 101:15.2]
    A --> C[Flexibility & Adhesion Test - IS 101:16]
    B --> D{No metal surface visible?}
    C --> E{No paint damage/cracking?}
    D -->|Yes| F[Pass]
    D -->|No| G[Fail]
    E -->|Yes| F
    E -->|No| G

**Use these

IS 3499 Part 1 - Packing Specifications Summary

• Clause 9.1: All component parts must be packed to prevent any damage during transit.
• No specific packing materials or methods are detailed; the emphasis is on damage prevention.
• Packing should consider protection against:
  • Mechanical shocks
  • Moisture and corrosion
  • Deformation or abrasion

General Packing Guidelines (Based on Engineering Practice)

• Use cushioning materials (foam, bubble wrap) around delicate parts.
• Employ sturdy boxes or crates matching the weight and size of components.
• Include desiccants if moisture-sensitive.
• Label packages clearly with handling instructions.

Related IS Code References

• Use materials conforming to IS standards (e.g., IS 1285 for aluminium tubes).
• For wooden packing crates, refer to commercial timber classifications.

flowchart LR
    A[Component Parts] --> B{Packing}
    B --> C[Protect from Mechanical Damage]
    B --> D[Protect from Moisture]
    B --> E[Prevent Deformation]
    C --> F[Use Cushioning]
    D --> G[Use Desiccants]
    E --> H[Use Rigid Containers]

Summary: IS 3499 Part 1 mandates packing to avoid damage in transit but leaves methods flexible. Use standard engineering packing practices with suitable materials.

IS 3499 Part 1 (1985) – Information to be Supplied by the Purchaser

Key Information Purchaser Must Provide (Clause 10.1)

• Type required (e.g., metal chairs with/without arms, seat/back type)
• Colour and finish
• Alternative construction/finish methods (if any, must be clearly specified)

Packaging Requirements (Clause 9.1)

• Components must be packed to prevent damage during transit.

Aluminium Tubes Properties (Clause 2.7 & Table)

• Aluminium tubes shall conform to IS:1285-1975 HV 20 WP or equivalent.

Summary for Purchaser’s Order Specification:

• Clearly specify type, colour, finish, and construction alternatives.
• Confirm compliance with material standards (e.g., aluminium tubes per IS:1285).
• Ensure packaging meets damage prevention criteria.

flowchart TD
    A[Purchaser] --> B[Specify Type]
    A --> C[Specify Colour & Finish]
    A --> D[Specify Alternative Methods]
    A --> E[Ensure Packaging Instructions]
    B & C & D & E --> F[Supplier Prepares Order]

This ensures clarity and conformity to IS 3499 Part 1 requirements.

IS 3499 Part 1 — Marking of Metal Chairs (Clause 11.1 & 11.1.1)

• Marking Requirement:
  All metal chairs shall be marked with a suitable mark identifying the manufacturer.

• ISI Certification Mark:
  Metal chairs may also carry the ISI Certification Mark, indicating compliance with Indian Standards under ISI's inspection and quality control system.

• Legal Use:
  The ISI Mark use is governed by the Indian Standards Institution (Certification Marks) Act and related rules.

• Purpose of Marking:

  • Manufacturer identification
  • Assurance of quality and standard conformity
  • Continuous ISI surveillance for compliance

Summary Table: Marking Requirements

Additional Notes:

• Marking should be clear and durable on metal chairs.
• Contact ISI offices for license and marking details (addresses provided in the code).

flowchart TD
    A[Metal Chair] --> B[Mark Manufacturer ID]
    B --> C{Use ISI Mark?}
    C -->|Yes| D[Apply ISI Certification Mark]
    C -->|No| E[Only Manufacturer Mark]
    D & E --> F[Ensure Marking Durability]

This ensures traceability and quality assurance as per IS 3499 Part 1.