polished building stones, Part 1: Granite

IS 14223 Part 1: Scope - Key Specifications & Tables

1. Scope Summary

• Applies to granite slabs.
• Compliance is checked by rounding values per IS 2:1960 rules.
• Sampling and conformity criteria ensure quality control of slabs.

2. Sampling & Conformity (Clause 8.2 & 8.3)

• All selected slabs are checked for general requirements, dimensions, finish.
• Lot is conforming if defectives ≤ permissible number.

3. Physical Properties of Granite (Table 1, Clause 5.1)

IS 14223 Part 1: Key References, Tables & Specifications

1. Rounding Off Values

• Follow IS 2: 1960 for rounding off numerical values.
• Retain the same number of significant places as specified in the standard.

2. Physical Properties of Granite (Table 1, Clause 5.1)

IS 14223 Part 1 (1995) - General Requirements Summary

1. General Inspection (Clause 8.3)

• Slabs selected per Table 2 (Clause 8.2) must be checked for:
  • General requirements
  • Dimensions
  • Finish
• Any slab failing any requirement = defective.
• Lot conformity if defective slabs ≤ permissible number (Table 2, col 3).

2. Sampling & Acceptance Criteria (Table 2)

3. Physical Properties of Granite (Table 1, Clause 5.1)

IS 14223 Part 1: Dimensions and Tolerances for Granite Slabs

Key Specifications (Clause 4.1.1)

• Shape: Rectangular or square slabs.
• Dimensional Tolerances:
  • Length & Breadth: +2 mm
  • Thickness: ±1 mm
• Surface Finish:
  • Top surface: Fine polished, no hollowness or spalling.
  • Bottom face: May be rough.
  • Joint faces: Dressed with top surface.

Rounding Off (General)

• Follow IS 2:1960 for rounding test or analysis results.
• Keep the same number of significant digits as specified.

Sampling & Defect Criteria (Clause 8.3, Table 2)

Physical Properties (Table 1, Clause 5.1)

IS 14223 Part 1 - Physical Properties of Granite (Clause 5.1 & Table 1)

IS 14223 Part 1: Surface Finish and Polishing of Polished Granite

Key Specifications:

• Surface Finish (Clause 6.1):

  • Granite surface must have a mirror finish without any hairline cracks.
  • Polish quality checked using a glassometer.
  • Minimum polish value: 95% reflectance.

• Dimensional Tolerances (Clause 4.1.1):

  • Slabs are rectangular/square.
  • Length & breadth tolerance: ±2 mm.
  • Thickness tolerance: ±1 mm.
  • Top surface: finely polished, no hollowness or spalling.
  • Bottom face may be rough.

Testing:

• Glassometer Test:
  • Measures reflectance % of polished surface.
  • Ensures surface glossiness and quality.

Summary Table:

flowchart LR
    A[Granite Slab] --> B[Check Dimensions]
    B -->|Length & Breadth ±2 mm| C[Accept/Reject]
    B -->|Thickness ±1 mm| C
    A --> D[Polish Surface]
    D --> E[Glassometer Test]
    E -->|≥95% Reflectance| F[Accept]
    E -->|<95% Reflectance| G[Reject]

This ensures polished granite meets aesthetic and dimensional standards per IS 14223 Part 1.

IS 14223 Part 1: Marking and Certification Key Points

• Manufacturer's Marking (Clause 7.1):
  Slabs must be marked suitably with the manufacturer's identification mark or initials for traceability.

• BIS Standard Mark (Clause 7.2):
  Products may carry the BIS Standard Mark, subject to licensing under the Bureau of Indian Standards Act, 1986.

  • Use of the Standard Mark is regulated by BIS rules and requires a license.
  • Details on licensing conditions are available from BIS.

• Rounding Off Results (Clause None):
  Test or analysis results must be rounded per IS 2:1960 rules:

  • Retain the same number of significant places as specified in the standard.
  • Ensures uniformity in reporting compliance.

Summary Table

For licensing and Standard Mark usage, consult the Bureau of Indian Standards directly.

IS 14223 Part 1: Sampling and Testing Key Points

Sampling (Clause 8.2 & Table 2)

• Defective slabs: Any slab failing in general requirements, dimensions, or finish is defective.
• Lot conformity: Number of defectives ≤ permissible defectives.

Testing Specifications (Table 1: Physical Properties of Granite)

IS 14223 Part 1 (1995) primarily references other Indian Standards relevant to polished building stones. While it does not provide direct formulas or tables, key points include:

• Rounding Off: Follow IS 2:1960 for rounding test results, retaining the same significant figures as the specified values.
• Referenced Indian Standards typically include:
  • IS 1121: Methods of test for building stones.
  • IS 1123: Code of practice for selection of stones.
  • IS 2386: Methods of test for aggregates (relevant for stone properties).
  • IS 383: Specification for coarse and fine aggregates.
  • IS 1138: Code of practice for construction of stone masonry.

These standards provide detailed test methods, specifications, and quality criteria for building stones.

Summary Table of Commonly Referenced IS Codes in Stone Standards

For detailed formulas or test procedures, refer directly to these IS codes.

flowchart LR
    A[IS 14223 Part 1] --> B[IS 2: Rounding Rules]
    A --> C[IS 1121: Test Methods]
    A --> D[IS 1123: Stone Selection]
    A --> E[IS 2386: Aggregate Tests]
    A --> F[IS 383: Aggregate Specs]
    A --> G[IS 1138: Stone Masonry]

IS 14223 Part 1: Committee Composition & Sampling Specifications

Committee Composition (Annex B)

• Chairman: Dr. V. M. Sharma (Central Soil & Materials Research Station, New Delhi)
• Members: Representatives from:
  • Builders Association of India
  • Delhi Marble Dealers Association
  • Central Public Works Department
  • Ministry of Surface Transport
  • Directorate of Mines and Geology (Rajasthan)
  • Army Headquarters Engineering Branch
  • Geological Survey of India
  • Various State PWDs
  • Indian Institute of Technology, Bombay
  • Central Building Research Institute, Roorkee
  • Indian Bureau of Mines, Nagpur
  • BIS Director (Ex-officio)
• Includes alternates for most members ensuring continuity.

Sampling & Conformity (Clause 8.2, Table 2)

• Physical Properties Testing (Clause 8.4): Sub-sample tested; lot passes if no slab fails.

Related IS References for Testing:

• IS 1121 (Parts 1,3,4): Strength properties (compressive, tensile, shear)
• IS 1124: Water absorption, porosity
• IS 1706: Abrasion resistance
• IS 4905: Random sampling
• IS 13630 (Part 13): Scratch hardness

flowchart TD
    A[Lot of Slabs] --> B[Select Sample Size as per Table 2]
    B --> C[Check Dimensions, Finish]
    C -->|Pass| D[Select Sub-sample for Physical Tests]
    D --> E{Any Failures?}
    E -->|No| F[Lot Accepted]
    E -->|Yes| G[Lot Rejected]

This ensures strict quality control via representative sampling and expert committee oversight