Drafting stools-Specification
1989 Edition

Overview of Scope

• Defines criteria for materials, sizes, construction, finishing, and testing applicable to stools/chairs paired with drafting and reference desks.
• Relevant for furniture design and quality assurance.
• Ensures ergonomic comfort, durability, and safety during use.

Main Features:

Note on Rounding: Measurement results must be rounded off in accordance with IS 2:1960, maintaining the specified significant figures.

flowchart LR
    A[Materials] --> B[Dimensions]
    B --> C[Construction]
    C --> D[Finish]
    D --> E[Testing]
    E --> F[Compliance with Standard]

This framework guarantees stools meet functional and safety demands when used with drafting/reference desks.

Indian Standards Referenced by IS 4205 (Annex A Overview)

This standard incorporates multiple related Indian Standards covering materials, welding processes, coatings, and furniture testing procedures. Key references include:

Additional Points:

• Follow IS 2:1960 for rounding off test data.
• Manufacturer identification marking is mandatory (Clause 11.1).
• Products adhering to these standards are eligible to carry the BIS certification mark.

Visualization of Referenced Standards

graph TD
  A[IS 4205] --> B[Paints & Finishes]
  A --> C[Steel & Aluminium Materials]
  A --> D[Welding Procedures]
  A --> E[Furniture Testing Standards]

  B --> IS110[IS 110, IS 151, IS 348]
  C --> IS513[IS 513, IS 1079, IS 7138]
  D --> IS814[IS 814 Part 2, IS 816, IS 819]
  E --> IS5416[IS 5416]

This ensures thorough compliance regarding materials and manufacturing.

Material Requirements as per IS 4205

Aluminium Tubing (Clause 3.2)

• Must adhere to IS 1285:1975 with designations 62400, 63400, or 65032.
• Alternatives permitted if minimum tensile strength and elongation criteria are met per the standard.

Aluminium Sheets (Clause 3.1)

• Should comply with IS 737:1986.
• Acceptable alloys include NS3, NS4, and those within 31500 to 40800 series.
• Condition: H2 temper.

Mild Steel Sheets (Clause 3.5)

• Must conform to either IS 513:1986 or IS 1079:1988.

Metal Components (Clause 7.1)

• Construction metals must meet referenced Indian Standards as detailed in IS 4205.

Summary Table

Refer to respective IS documents for precise mechanical property values.

Dimensional Requirements and Tolerances for Drafting Stools

Principal Measurements (Clause 4.1 & Figure 1)

• All measurements are expressed in millimeters.
• Angular tolerance is included within the 95°–105° range.
• Final dimension values must be rounded per IS 2:1960.

Material Reference

• Wood used should comply with IS 399:1963 for furniture-grade timber.

Diagrammatic Summary of Adjustable Stool Dimensions

graph TD
    A[Seat Reference Plane]
    B[Backrest Reference Plane]
    C[Footrest]
    A -->|Seat Height ≤ 700 mm| D[Seat Diameter 350 mm]
    B -->|Backrest Height 150–200 mm| E[Adjustable Backrest Height 225–325 mm]
    B -->|Backrest Angle 95°–105°| F[Backrest Centerline]
    C -->|Footrest Height 430 mm| G[Footrest Length 370 mm]

Recommended tolerance of ±5 mm for all linear values ensures compliance with IS 4205.

Construction Guidelines for Drafting Stools

• Material Usage:

  • Aluminium tubes must meet IS 1285:1975 (designations 62400, 63400, or 65032) with minimum tensile strength and elongation as specified.
  • Wood components should adhere to IS 399:1963, ensuring suitability for furniture.

• Dimensions and Tolerances:

  • Refer to Clause 4 for detailed dimensional criteria.
  • Key dimensions include seat height, width, and backrest sizing tailored for drafting tasks.

• Finish and Assembly:

  • Buyer must specify color, finish type, and any alternative construction methods at the time of order (Clause 9.1).
  • Surface finishing must balance durability with visual appeal.

Aluminium Tube Minimum Properties (per IS 1285)

(Exact values depend on tube designation.)

Visual Summary of Construction Elements

graph LR
    A[Materials] --> B[Aluminium Tubes (IS 1285)]
    A --> C[Wood (IS 399)]
    D[Dimensional Specifications] --> E[Seat, Backrest]
    F[Finish & Color] --> G[Customer Specification]

For full dimensional details and test methods, consult the complete IS 4205 document.

Assembly and Welding Requirements According to IS 4205

• Assembly Method (Clause 6.1): Components are to be joined primarily by welding.

• Welding Techniques (Clause 6.1.1):

  • Gas welding per IS 1323:1982
  • Arc welding following IS 816:1969
  • Spot welding as per IS 819:1957

• Aluminium Welding (Clause 6.1.2):

  • Aluminium components must follow IS 2812:1964 standards.

• Electrode Standards (Clause 3.3):

  • Gas welding electrodes: IS 1278:1972
  • Arc welding electrodes: IS 814 (Part 2):1974
  • Spot welding electrodes: IS 4972:1968

Summary Table of Welding Specifications

Key Notes:

• Welding must conform to the referenced IS to ensure structural integrity.
• Appropriate electrode selection is vital for weld strength and longevity.
• Detailed welding parameters such as current, voltage, and speed are specified in the respective IS codes.

flowchart LR
    A[Component Parts] --> B[Welding Assembly]
    B --> C{Welding Type}
    C --> D[Gas Welding (IS 1323)]
    C --> E[Arc Welding (IS 816)]
    C --> F[Spot Welding (IS 819)]
    D --> G[Electrodes IS 1278]
    E --> H[Electrodes IS 814]
    F --> I[Electrodes IS 4972]
    B --> J[Aluminium Welding (IS 2812)]

Key Guidelines on Surface Preparation and Finishing

• Surface Preparation (Clause 7.1.1): Remove dents, burrs, and sharp edges, then perform pickling, scrubbing, and rinsing to eliminate grease, rust, and mill scale.

• Treatment for Mild Steel (Clause 7.1.2):

  • Apply phosphating treatment as per IS 3618:1966.
  • Follow with primer coating such as red oxide.
  • Use putty for filling surface imperfections according to IS 110:1988.

• Aluminium Finishing (Clause 7.1.4):

  • Anodizing may be applied if requested by the purchaser.
  • Anodizing must comply with Grade AC 25 in IS 1868:1982.

• Order Specifications (Clause 9.1): Purchasers must clearly specify desired color, finish, and any alternative finishing techniques.

Summary Table

flowchart LR
    A[Component] --> B[Remove Dents, Burrs, Sharp Edges]
    B --> C[Pickling]
    C --> D{Material Type?}
    D -->|Mild Steel| E[Phosphating]
    E --> F[Primer Coating]
    F --> G[Putty Filling]
    D -->|Aluminium| H[Anodizing]

These steps ensure protection against corrosion and achieve the desired appearance in line with IS 4205.

Packaging Guidelines to Prevent Damage (Clause 8.1)

• Goal: Safeguard all parts against mechanical injury and corrosion during shipping.
• Packaging Requirements: Use adequate cushioning and anti-corrosive materials.
• Secure parts firmly to avoid movement inside packaging.
• Clearly label packages with handling instructions.

Additional Considerations:

• The standard does not provide explicit packaging formulas or tables.
• Packaging should account for the weight, fragility, mode of transport, duration, and environmental conditions such as humidity and temperature.

Packaging Considerations Table

Best Practice: Adhere strictly to Clause 8.1 and supplement with sound engineering packaging methods to ensure safe delivery.

Details to be Furnished by Buyers (Clause 9)

To facilitate correct production and delivery, purchasers should specify:

• Exact color shade and finish preference.
• Any alternate construction or finishing options if applicable.

Additional Points:

• Packaging requirements as per Clause 8.1.
• Rounding of test results should follow IS 2:1960.
• Annex A lists related Indian Standards that ensure full compliance.

Purchaser Information Summary

Clear instructions help avoid manufacturing mistakes and confirm compliance with IS 4205.

Testing and Performance Standards for Drafting Stools

Strength Requirements (Clause 10.1):

• Stools must pass static and fatigue strength tests as outlined in IS 5416 (Part 1):1988 at Test Level 4.
• Acceptance criterion: No visible damage or defects post-testing.

Rounding Off Test Data:

• Results must be rounded following IS 2:1960, retaining specified significant figures.

Referenced Standards:

• IS 5416 (Part 1):1988 details fatigue and static strength tests.
• IS 2:1960 governs numerical rounding.

Summary of Test Level 4 Requirements (from IS 5416 Part 1)

flowchart LR
    A[Stool Sample] --> B[Static Strength Test]
    B -->|No Defects| C[Fatigue Strength Test]
    C -->|No Defects| D[Pass]
    B -->|Defects Found| E[Fail]
    C -->|Defects Found| E

Refer to IS 5416 (Part 1):1988 Table 2 for detailed load and cycle specifications.

Marking Requirements for Drafting Stools (Clause 11.1)

• Each stool must be clearly marked with the manufacturer’s identification.
• This facilitates traceability and responsibility.
• The use of the BIS Standard Mark certifies adherence to IS requirements and quality assurance under the BIS Act, 1986.
• Related standards for materials and manufacturing processes are referenced in Annex A.

Marking Information Table

Rounding Off Note:

Test result values must be rounded per IS 2:1960 with significant digits as specified.

flowchart TD
    A[Manufacturing Process] --> B[Marking Manufacturer ID]
    B --> C[Quality Inspection]
    C --> D[Product Traceability]
    D --> E[Compliance with IS 4205]

Summary: Ensure all stools carry manufacturer marks to comply with IS 4205 and BIS standards.