metal nesting chairs- Specification
1977 Edition

Overview of Scope - IS 4103

Summary:

• Defines specifications for materials and components, emphasizing finishing and marking requirements.
• Purchasers must state preferred colour, finishing, and any alternate construction techniques (Clause 9.1).
• Wooden parts require specific finishes such as wax polish, French polish, staining, lacquer, epoxy, or melamine (Clause 6.3).
• Detailed performance criteria for finishes are provided in subsequent clauses.

Key Measurement Units

Ordering Instructions (Clause 9.1)

• Specify desired colour and finish.
• Indicate any alternative fabrication or finishing methods.

Finishing Options for Wooden Components (Clause 6.3)

• Wax polish
• Glossy transparent French polish
• Dark stain and polish
• Lacquer coating
• Epoxy or melamine finishing

Rounding Rules (Clause 0.4)

• Final measured or tested values should be rounded in accordance with IS 2-1960.
• Maintain consistent significant figures matching specified values.

flowchart TD
    A[Order Placement] --> B{Information Required}
    B --> |Colour & Finish| C[Supplier Prepares Accordingly]
    B --> |Alternate Methods| C
    C --> D[Component Fabrication]
    D --> E[Apply Finishing as per Clause 6.3]

Refer to clauses 7 and 9 for detailed requirements on performance and marking.

Material Standards and Requirements of IS 4103

• Mild Steel Elements (Clause 6.1):

  • Steel sheets must comply with IS 513:1973 (Cold rolled) or IS 1079:1973 (Hot rolled).

• Wooden Parts (Clause 6.3):

  • Acceptable finishes include wax polish, transparent glossy French polish, dark stain with polish, lacquer, epoxy, or melamine.

• Surface Treatments and Paints:

  • Phosphating for corrosion resistance.
  • Paste filler for color coats.
  • Ready-mixed paints suitable for brushing, spraying, undercoating, stoving (including enamels).
  • Anodic coating for aluminium as per the first revision.

• Units and Measurements:

  • Force: 1 N = 1 kg·m/s²
  • Pressure/Stress: 1 Pa = 1 N/m²
  • Energy: 1 J = 1 N·m
  • Power: 1 W = 1 J/s

Mild Steel Sheet Summary

flowchart TD
    A[Wooden Parts] --> B[Wax Polish]
    A --> C[French Polish]
    A --> D[Stain & Polish]
    A --> E[Lacquer]
    A --> F[Epoxy or Melamine Finish]

Detailed paint and surface treatment standards are to be cross-referenced with the IS codes cited in Clause 6 of IS 4103.

Key Specifications and Guidelines for Chair Components (IS 4103)

Mild Steel Parts (Clause 6.1)

• Use mild steel conforming to relevant IS standards.
• Surface treatments may include phosphating for corrosion protection.
• Paint finishes should comply with IS standards, including aluminium-zinc oxide primers and enamels.

Aluminium Elements (Clause 6.2)

• Aluminium parts may be anodized.
• Minimum anodic coating thickness must meet Grade AC15 as per IS 1868-1968.

Wooden Components (Clause 6.3)

• Finishing options include:
  • Wax polish
  • Glossy transparent French polish
  • Dark stain and polish
  • Lacquer
  • Epoxy or melamine coatings

Marking and Ordering Details (Clause 9.1)

• The purchaser must specify:
  • Desired colour and finish.
  • Any alternative fabrication or finishing methods.

Measurement Units (SI Units)

flowchart TD
    A[Steel Component] --> B[Phosphating Treatment]
    B --> C[Primer Application (Al-Zn Oxide)]
    C --> D[Enamel Painting]
    A --> E[Aluminium Component]
    E --> F[Anodizing (Grade AC15)]
    A --> G[Wooden Component]
    G --> H[Wax/French Polish/Epoxy Finish]

This section summarizes essential component specifications, finishing procedures, and purchaser instructions per IS 4103. For comprehensive design criteria, consult the full standard and referenced IS codes.

Design and Construction Guidelines per IS 4103

• Material Requirements:

  • Aluminium sheets must meet IS 737-1974, designation 31000 or 52000 (Clause 2.4).
  • Wooden parts require finishes such as wax polish, French polish, lacquer, epoxy, or melamine (Clause 6.3).

• Ordering Details (Clause 9.1):

  • Purchaser to specify colour and finish.
  • Alternate construction or finishing methods must be clearly declared.

• Surface Treatments and Paints:

  • Phosphating for corrosion protection.
  • Use of paste filler, aluminium-zinc oxide primers, enamel topcoats, and anodic coatings for aluminium.

• Measurement Units:

  • Length: meters (m)
  • Mass: kilograms (kg)
  • Force: newtons (N), where 1 N = 1 kg·m/s²
  • Pressure/Stress: pascals (Pa), where 1 Pa = 1 N/m²

• Rounding of Values (Clause 0.4):

  • Final testing results should be rounded following IS 2-1960, retaining significant figures consistent with specified values.

Material and Finish Summary

Fundamental Equations

• Force:
  [ F = m \times a \quad (N = kg \cdot m/s^2) ]

• Stress/Pressure:
  [ \sigma = \frac{F}{A} \quad (Pa = N/m^2) ]

flowchart TD
    A[Order Received] --> B[Specify Colour & Finish]
    B --> C{Alternate Methods?}
    C -- Yes --> D[Specify Construction & Finish]
    C -- No --> E[Proceed as Standard]
    D --> E
    E --> F[Select Materials]
    F --> G[Aluminium Sheets (IS 737)]
    F --> H[Wooden Components]

For detailed construction and thickness tables, please consult the complete IS 4103 text and referenced standards.

Critical Dimensions for Metal Nesting Chairs (Clause 5.1 of IS 4103)

• Seat Height from Floor:
  (430 \pm 5 \text{ mm})
  (Lower than traditional 455 mm to improve ergonomics for nesting chairs)

• General Notes:

  • All dimensions are in millimeters (mm).
  • Refer to Figure 1 in IS 4103 for typical layout of nesting chairs.
  • Purchaser must specify colour, finish, and construction method as per Clause 9.1.

Dimension Summary Table

Additional Notes

• Measurements should follow IS 2-1960 rounding rules.
• Purchasers must provide technical details at ordering stage.

flowchart LR
    A[Order Received] --> B[Specify Colour & Finish]
    B --> C[Specify Construction Method]
    C --> D[Manufacturing]
    D --> E[Dimension Verification]
    E --> F{Seat Height Correct?}
    F -- Yes --> G[430 ± 5 mm]
    F -- No --> H[Reject or Modify]

This ensures adherence to IS 4103's dimensional mandates for nesting chairs.

Surface Treatment and Finishing Requirements Under IS 4103

Wooden Parts (Clause 6.3)

• Finishing options include:
  • Wax polishing
  • Transparent glossy French polishing
  • Dark staining followed by polishing
  • Lacquering
  • Epoxy or melamine finishes

Metal Components Treatments

Paint Requirements

• Ready-mixed paints suitable for brushing, spraying, undercoating, stoving.
• Aluminium-zinc oxide composite primers.
• Anodic coatings for aluminium as per revised standards.

Typical Surface Treatment Flow for Mild Steel

flowchart LR
    A[Pickling] --> B[Phosphating (IS 3618)]
    B --> C[Primer Application (Red Oxide)]
    C --> D[Putty Application (IS 426)]
    D --> E[Final Painting]

Refer to the detailed IS codes for specific procedural and quality requirements.

Performance Criteria for Finishes (Clause 7, IS 4103)

• Wooden Components (Clause 6.3):

  • Finishing with wax polish, transparent glossy French polish, or dark stain with polish/lacquer.
  • Alternatively, epoxy or melamine coatings.

• Paint and Coating Specifications:

  • Phosphating for corrosion prevention on iron and steel.
  • Paste filler for colour coats.
  • Ready-mixed paints for brushing, spraying, undercoating, and stoving.
  • Aluminium-zinc oxide composite primers.
  • Anodic coatings on aluminium (first revision).

• Enamel Paint Coats (Clause 6.1.3):

  • Final enamel coatings must comply with IS 151:1950, IS 2932:1974, and IS 2933:1975.

• Rounding of Test Results (Clause 0.4):

  • Test results should be rounded following IS 2:1960, maintaining significant figures consistent with the specified values.

Key Paint Standards

flowchart TD
    A[Wooden Parts] --> B[Wax/French Polish or Stain + Polish]
    A --> C[Epoxy or Melamine Finish]
    D[Iron/Steel] --> E[Phosphating Treatment]
    F[Painting Process] --> G[Primer (Al-Zn Oxide)]
    F --> H[Undercoats and Enamel Finishing]
    H --> I[Final Coat as per IS]

These finish requirements ensure longevity and aesthetic quality of metal nesting chairs.

Marking Guidelines According to IS 4103

Clause 9.1: Purchaser’s Requirements

• The purchaser must clearly specify:
  • Desired colour and finishing.
  • Any alternate construction or finishing procedures.

Clause 8.1.1: ISI Certification Mark Usage

• Chairs may bear the ISI mark signifying compliance with Indian Standards.
• The ISI mark assures adherence to strict quality controls and inspection protocols.
• Usage of the ISI mark is governed by the Indian Standards Institution (Certification Marks) Act.

Clause 6.3: Wooden Component Finishing

• Wooden sections must have one of the approved finishes: wax polish, transparent glossy French polish, stained and polished, lacquer, epoxy, or melamine.

Units and Symbols (SI Units)

Marking Process Flow

flowchart TD
    A[Order Placement] --> B[Specify Colour & Finish]
    B --> C[Specify Alternative Methods]
    C --> D[Manufacturing]
    D --> E[Apply Finishing]
    E --> F[Apply ISI Mark if Authorized]

Refer to the cited IS standards for detailed painting and finishing requirements.

Purchaser's Obligations (Clause 9.1 of IS 4103)

When placing orders, purchasers must provide:

• Clear specifications of the chair's colour and finish.
• Any alternative construction or finishing methods intended for use.

Additional Notes:

• Final test or measurement data must be rounded following IS 2-1960, preserving the number of significant figures as per the specified values.
• Approved finishes for wooden parts include:
  • Wax polish
  • Transparent glossy French polish
  • Dark stain with polish
  • Lacquer
  • Epoxy or melamine coatings

Relevant SI Units Used in IS 4103

Purchaser Information Flowchart

flowchart TD
    A[Purchaser] -->|Places Order| B[Supplier]
    B -->|Receives Specifications| C{Order Details}
    C -->|Colour & Finish| D[Manufacture]
    C -->|Construction Method| D
    D --> E[Product Delivery]

Ensuring clarity in finish and construction specifications is essential for compliance with IS 4103.

Packaging Specifications per IS 4103

• Clause 7.1: All parts must be appropriately packed to avoid damage during transportation.

• Clause 9.1: Purchasers must provide:

  • Colour and finishing details.
  • Any alternate fabrication or finishing methods.

• Clause 6.3: Wooden components should have finishes such as wax polish, French polish, stain and polish, lacquer, epoxy, or melamine.

• Protective Treatments:

  • Phosphating to prevent corrosion.
  • Use of primers and paints including aluminium-zinc oxide composite primers and enamel coatings.

• Marking and Order Information:

  • Technical details must be supplied by purchasers at the ordering stage.

Packaging and Finishing Summary Table

Key Units for Reference (SI)

flowchart TD
    A[Order Received] --> B{Purchaser Provides Details}
    B -->|Colour & Finish| C[Supplier Prepares Components]
    B -->|Alternate Methods| C
    C --> D[Finishing (Polish, Paint)]
    D --> E[Packaging to Prevent Damage]
    E --> F[Delivery]

Refer to the respective IS standards cited for detailed paint and treatment instructions.