Metal letter-rests

IS 9236: Scope Key Points

• Purpose: Specifies dimensions, tests, and quality requirements for letter-rests.
• Rounding Off: Final test or calculation values must be rounded as per IS 2:1960, keeping the same number of significant figures as the specified values.
• Dimensions (Clause 4.1):

• Tests: Resistance to humidity under continuous condensation as per IS 101 (Part 6/Sec 1):1988.
• Annex A: Lists related Indian Standards essential for compliance.
• Purchaser Info: Clause 9 specifies information to be supplied by the purchaser for clarity.

flowchart TD
    A[IS 9236 Scope] --> B[Dimensions]
    B --> B1[Length: 380 mm ± 5 mm]
    B --> B2[Width: 255 mm ± 5 mm]
    A --> C[Rounding Off]
    C --> C1[As per IS 2:1960]
    A --> D[Tests]
    D --> D1[Humidity Resistance (IS 101 Part 6/Sec 1)]
    A --> E[Related Standards]
    E --> E1[Annex A]
    A --> F[Purchaser Info]

This summarizes the scope including dimensions, testing, and rounding rules.

IS 9236: Referenced Indian Standards Overview

• Annex A of IS 9236 lists all necessary adjunct Indian Standards referenced for compliance.
• These standards cover related materials, testing methods, design, and safety requirements.
• For exact compliance, refer to the latest editions of these referenced IS codes.
• Rounding off test or calculation results must follow IS 2:1960 "Rules for rounding off numerical values," maintaining the same significant figures as specified.

Key Points:

Common Referenced IS Codes (examples):

• IS 456: Plain and Reinforced Concrete
• IS 800: Steel Structures
• IS 875: Loads on Structures
• IS 1893: Earthquake Resistant Design

Always check Annex A for the complete and updated list.

flowchart LR
    A[IS 9236] --> B[Annex A: Referenced IS Codes]
    B --> C[Material Standards]
    B --> D[Design Codes]
    B --> E[Testing Methods]
    B --> F[Safety & Load Codes]
    A --> G[IS 2:1960 Rounding Rules]

IS 9236: Key Materials Specifications

Aluminium Sheets (Clause 3.1)

• Shall conform to IS Designations 31000, 31500, 40800, or 52000.
• Condition: H2 temper as per IS 737:1986.

Mild Steel Sheets (Clause 3.3)

• Shall conform to:
  • Grade 0 of IS 1079:1988, or
  • Grade 0 of IS 513:1986.

Testing for Resistance to Humidity (Clause 8.1.4)

• Conduct tests as per IS 101 (Part 6/Sec 1):1988, Section 2.
• Focus on continuous condensation resistance.

Numerical Values & Rounding (Clause 9)

• Follow IS 2:1960 for rounding off test results.
• Retain the same number of significant digits as in the specified values.

Summary Table: Material Standards

This ensures material quality and uniformity in construction as per IS 9236.

IS 9236: Dimensions and Tolerances for Metal Letter-Rests

Key Dimensions (Clause 4.1)

• The overall dimensions of letter-rests must be within ±5 mm of the specified length and width.
• Mild steel sheets used should conform to Grade 0 of IS 1079:1988 or Grade 0 of IS 513:1986.

Rounding Off (IS 2:1960)

• Final measured or calculated values must be rounded off as per IS 2:1960.
• Retain the same number of significant figures as specified in the standard.

This ensures dimensional accuracy and material compliance for metal letter-rests per IS 9236.

IS 9236: Construction Requirements - Key Points

1. Resistance to Humidity (Clause 8.1.4)

• Test as per IS 101 (Part 6/Sec 1): 1988 for continuous condensation.
• Ensures material durability under humid conditions.

2. Material Specifications

• Mild Steel Sheets (Clause 3.3):
  • Must conform to Grade 0 of IS 1079:1988 or IS 513:1986.
• Aluminium Sheets (Clause 3.1):
  • Must conform to IS Designations 31000, 31500, 40800, or 52000.
  • In H2 temper condition as per IS 737:1986.

3. Dimensional Tolerances

• Follow specified tolerances as per material standards above.
• Rounding off values as per IS 2:1960 rules, maintaining significant digits matching the standard.

Summary Table:

This ensures compliance with IS 9236 construction requirements for materials and environmental durability.

IS 9236: Assembly Methods - Key Points

• Assembly Techniques (Clause 6.1):

  • Components joined by welding, bending to interlock, or riveting.

• Welding Standards:

  • Gas welding: IS 1323 : 1982
  • Arc welding: IS 816 : 1969
  • Spot welding: IS 819 : 1957
  • Aluminium welding: IS 2812 : 1964

• Surface Treatment (Clause 7.2):

  • After pickling, mild steel components must have phosphating treatment per Class C, IS 3618 : 1966.
  • Phosphate coating application as per IS 6005 : 1970.
  • Use putty (IS 110 : 1983) for filling surfaces.
  • Aluminium primer per IS 5660 : 1970.

Summary Table: Welding Methods and Relevant IS Codes

Assembly Flow (Simplified):

flowchart TD
    A[Components] --> B{Assembly Method}
    B -->|Welding| C[Gas / Arc / Spot Welding]
    B -->|Bending| D[Interlocking Components]
    B -->|Riveting| E[Riveted Joints]
    C --> F[Follow respective IS codes]
    D --> F
    E --> F
    F --> G[Surface Treatment]
    G --> H[Pickling]
    H --> I[Phosphating (IS 3618)]
    I --> J[Putty Application (IS 110)]
    J --> K[Primer Application (IS 5660)]

This ensures durable, corrosion-resistant, and structurally sound assemblies as per IS 9236.

IS 9236: Surface Treatment and Finishes - Key Points

1. Phosphating Treatment (Clause 7.2)

• After pickling, all mild steel parts must receive phosphating treatment.
• Must conform to Class C of IS 3618:1966.
• Application process as per IS 6005:1970.
• Purpose: Improve corrosion resistance and paint adhesion.

2. Putty and Primer

• Putty for surface filling must conform to IS 110:1983.
• Aluminium primer must conform to IS 5660:1970.

3. Powder Coating (Clause 7.4)

• Optional powder coating on mild steel as per IS 13871:1993.
• Used if purchaser requires enhanced finish and durability.

4. Testing of Finishes (Clause 8.1)

• Tests (8.1.1 to 8.1.4) to verify finish performance include:
  • Adhesion
  • Corrosion resistance
  • Hardness
  • Thickness (details in IS 9236)

5. Purchaser Information (Clause 9.1)

• Must specify:
  • Colour of finish
  • Construction and finish alternatives
  • Number of trays

Summary Table: Surface Treatment Standards

flowchart TD
    A[Pickling] --> B[Phosphating Treatment (IS 3618, IS 6005)]
    B --> C[Putty Application (IS 110)]
    C --> D[Aluminium Primer (IS 5660)]
    D --> E{Powder Coating?}
    E -- Yes --> F[Powder Coating (IS 13871)]
    E -- No --> G[Final Finish & Testing (IS 923

IS 9236 - Testing Procedures: Key References & Specifications

• Rounding Off Results:
  Follow IS 2:1960 for rounding test results. Retain significant figures equal to those in the standard's specified values.

• Hardness Test (Clause 8.1.1):
  Conduct as per IS 101 (Part 5/Sec 1): 1988, which details methods for measuring hardness of paints/coatings.

• Flexibility and Adhesion Test (Clause 8.1.2):
  Perform according to IS 101 (Part 5/Sec 2): 1988, covering procedures for assessing coating flexibility and adhesion.

• Resistance to Humidity under Continuous Condensation (Clause 8.1.4):
  Use the method in IS 101 (Part 6/Sec 1): 1988, specifying conditions for humidity exposure and condensation testing.

Summary Table of Relevant IS 101 Parts for IS 9236 Testing

Note: For detailed procedures, refer to the respective IS 101 parts. These specify apparatus, sample preparation, test conditions, and acceptance criteria.

IS 9236: Information to be Supplied by the Purchaser

Per Clause 9.1, the purchaser must provide:

• Colour of finish required for the product.
• Alternative construction/finish methods, if any, clearly specified.
• Number of trays needed.

Additional Specifications:

• Tray Spacing: As per Clause 4.3, trays should have a minimum spacing of 65 mm.
• The number of trays is mutually agreed (Clause 4.3 and Clause 9.1c).

Testing Reference:

• Resistance to humidity under continuous condensation is tested as per IS 101 (Part 6/Sec 1):1988 (Clause 8.1.4).

Summary Table

This ensures clarity in order processing and compliance with IS 9236 standards.

IS 9236 - Marking of Metal Letter-Rests

Key Specifications on Marking:

• Clause 10.1:
  All metal letter-rests must bear a suitable mark identifying the manufacturer.

• Clause 10.1.1:
  Metal letter-rests may also be marked with the Standard Mark (IS mark) to indicate conformity.

Additional Relevant Details:

• Surface Treatment (Clause 7.2):
  Before marking, mild steel components undergo phosphating treatment (Class C, IS 3618:1966) after pickling, ensuring good adhesion of coatings and markings.
  Application process as per IS 6005:1970.

• Rounding Off (General Clause):
  Test results for marking compliance should be rounded following IS 2:1960 rules, maintaining the same number of significant figures as specified.

Summary Table for Marking Requirements

flowchart TD
    A[Metal Letter-Rest] --> B[Pickling]
    B --> C[Phosphating Treatment (Class C, IS 3618)]
    C --> D[Marking]
    D --> E{Mark Type}
    E -->|Manufacturer's Mark| F[Mandatory]
    E -->|Standard Mark (IS Mark)| G[Optional]

This ensures traceability and quality assurance for metal letter-rests as per IS 9236.

IS 9236: List of Referenced Indian Standards

• Annex A of IS 9236 lists all the necessary Indian Standards (IS) referenced as adjuncts for compliance.
• These referenced IS codes cover materials, testing methods, and design specifications relevant to IS 9236.
• For example, common referenced standards might include:
  • IS 456: Code of Practice for Plain and Reinforced Concrete
  • IS 1893: Criteria for Earthquake Resistant Design
  • IS 875: Code of Practice for Design Loads
  • IS 2: Rules for rounding off numerical values (important for test result reporting)

Key Specification: Rounding Off Values

• Use IS 2:1960 for rounding test or analysis results.
• Retain the same number of significant digits as the specified value in IS 9236.

Summary Table (Example)

This ensures consistency and accuracy in applying IS 9236 with related standards.

IS 9236 Committee Composition Summary

The Furniture Sectional Committee (CED 35) responsible for IS 9236 comprises experts from diverse organizations:

• Alternates are nominated for most members.
• The committee ensures comprehensive representation from industry, government, research, and academia.

Note: This committee composition is detailed in Annex B of IS 9236 and is crucial for standard formulation and revision.

graph TD
    A[Chairman: SARI J. A. Panchal] --> B[Small Scale Steel Furniture Manufacturers Association]
    A --> C[Directorate General of Supplies and Disposals]
    A --> D[All India Plastics Manufacturers Association]
    A --> E[Central Building Research Institute]
    A --> F[Godrej and Boyce Mfg Co Ltd]
    A --> G[Supreme Industries Ltd]
    A --> H[Indian Plywood Mfg Co Pvt Ltd]
    A --> I[National Buildings Organization]
    A --> J[Army Headquarters]
    A --> K[Indian Institute of Technology Bombay]
    A --> L[Building Materials and Technology Promotion Council]
    A --> M[Central Public Works Department]
    A --> N[Forest Research Institute]
    A --> O[Indian Oil Corporation Ltd]
    A --> P[BIS Director General (Ex-officio)]

This structure ensures balanced inputs for furniture standards development under IS 9236.