Specification for burnt clay perforated building bricks
1991 Edition

IS 2222: Scope & Core Specifications

• Scope: Defines the size ranges, tolerance limits, and essential quality criteria for burnt clay perforated bricks.
• Rounding Guidelines (Clause 4): Testing and measurement results must be rounded according to IS 2:1960, preserving the specified number of significant digits.
• Referenced Standards (Clause 2.1): Annex A enumerates related Indian Standards integral to this code.
• Dimensions & Tolerances (Clause 5.2):

• These tolerances apply to each individual brick measurement.
• Definitions (Clause 3.1): Terminology follows IS 2248:1991.

This section ensures consistent brick sizing and quality assessment under IS 2222.

IS 2222:1991 - Associated Indian Standards (Annex A)

The standard references several crucial Indian Standards to support comprehensive compliance and understanding:

Highlights:

• These documents clarify terminology, sampling, and testing procedures.
• Compliance with IS 2222 requires adherence to these referenced standards.
• The presence of the Standard Mark ensures BIS-certified quality.
• Always refer to the latest versions or amendments.

Practical Usage:

• Use IS 2248 for terminology definitions.
• Use IS 5454 for sampling protocols.
• Use IS 3495 for performance testing.
• Use IS Parts 1-4 for detailed brick specifications.

flowchart LR
    A[IS 2222] --> B[IS 2248: Terminology]
    A --> C[IS 5454: Sampling]
    A --> D[IS 3495: Testing]
    A --> E[IS Parts 1-4: Brick Specifications]

This framework ensures a thorough approach to quality and compliance.

IS 2222 - Definitions and Clarifications

• Definitions: As per Clause 3.1, terms used are defined by IS 2248:1991 for burnt clay bricks. Refer for terms such as "Modular Brick" and "Overburnt Brick".

• Rounding Off (Clause 4): Final measurement and testing data should be rounded in line with IS 2:1960, maintaining the significant figures as per specifications.

• Dimensional Tolerances (Clause 5.2): Acceptable size deviations are:

• Annex A (Clause 2.1): Lists applicable Indian Standards that complement IS 2222.

Brick Dimensions Tolerance Summary

| Brick Size (mm) | Allowed Variation (mm) |
|-----------------|-----------------------|
| 70, 90          | ±4                    |
| 110, 190        | ±7                    |
| 230             | ±10                   |

Cross-reference IS 2248:1991 for comprehensive definitions.

IS 2222: Overview of Quality Requirements

• Terminology: Refer to IS 2248:1991 for relevant terms.

• Rounding Practices (Clause 4): Numerical figures must conform to rounding rules of IS 2:1960, retaining the prescribed number of significant digits.

• Sampling and Acceptance (Clause 8.1): Sampling must follow procedures outlined in IS 5454:1978.

• Minimum Thickness Parameters (Clause 6.4):

  • Shell thickness should be at least 15 mm.
  • Web thickness should be at least 10 mm.

Minimum Thickness Chart

Notes:

• Physical and mechanical characteristics must satisfy specified clauses such as Clause 7.
• Test values should be rounded according to IS 2:1960 for consistency.

flowchart TD
    A[Product: Brick] --> B{Component Thickness}
    B --> C[Shell ≥ 15 mm]
    B --> D[Web ≥ 10 mm]
    E[Testing] --> F[Rounding per IS 2:1960]
    G[Sampling] --> H[IS 5454:1978 Compliance]

This assures brick manufacturing meets quality standards.

IS 2222 - Specifications on Dimensions and Tolerances

1. Standard Brick Sizes (Clause 5.1)

2. Allowed Deviations (Clause 5.2)

• These tolerances apply to each brick individually.
• Measurement rounding must comply with IS 2:1960.

3. Essential Characteristics (Clause 4.1)

• Bricks must be rectangular with edges forming right angles.
• Free from cracks, defects, and lime nodules.
• Uniform color and texture.
• Manufactured from appropriate clay and fired at proper temperatures.

Ensures dimensional precision and quality for strength and aesthetic uniformity in masonry.

IS 2222: Requirements for Brick Perforations

• Perforation Area Ratio: The perforations must cover between 30% and 45% of the brick face area (Clause 6.1).

• Size Limits for Perforations:

  • Rectangular perforations: shorter side must be less than 20 mm, with the longer side aligned parallel to the longer brick dimension (Clause 6.2).
  • Circular perforations: diameter must be less than 25 mm (Clause 6.2).

• Maximum Area per Perforation: No individual perforation should exceed 500 mm² (Clause 6.3).

• Distribution: Perforations should be evenly spread across the brick face (Clause 6.2).

Summary Table

Perforation Layout Diagram

graph LR
A[Brick Face] --> B[Rectangular Holes]
B --> C[Longer side aligned with brick length]
B --> D[Shorter side < 20 mm]
A --> E[Circular Holes]
E --> F[Diameter < 25 mm]

These criteria ensure bricks provide sufficient strength, ventilation, and insulation.

IS 2222: Summary of Physical Characteristics

• Minimum Thickness Requirements:

  • Shell thickness ≥ 15 mm
  • Web thickness ≥ 10 mm (Clause 6.4)

• Dimensional Tolerances (Clause 5.2):

• Rounding of Results: Testing values must be rounded following IS 2:1960 guidelines, maintaining the number of significant digits (Clause 7).

• Terminology: Refer to IS 2248:1991 for relevant definitions (Clause 3.1).

Important Notes:

• Adherence to minimum thickness and tolerance standards is crucial for structural soundness.
• Proper rounding aids in consistent reporting of test data.

flowchart TD
    A{Brick Dimension} -->|70 or 90 mm| B[Tolerance ±4 mm]
    A -->|110 or 190 mm| C[Tolerance ±7 mm]
    A -->|230 mm| D[Tolerance ±10 mm]
    B & C & D --> E[Verify Thickness]
    E --> F[Shell ≥ 15 mm]
    E --> G[Web ≥ 10 mm]
    F & G --> H[Compliance with IS 2222]

IS 2222: Sampling Methods and Compliance Standards

• Sampling Approach: Following Clause 8.1, sampling and acceptance procedures align with IS 5454:1978, which covers:

  • Determining sample size based on batch quantity.
  • Using random selection techniques.
  • Applying statistical criteria for acceptance or rejection.

• Compliance Requirements:

  • Test outcomes must meet designated limits after rounding according to IS 2:1960 (same decimal precision as specified values).
  • Maximum average warpage allowed is 3% for bricks, tested per IS 3495 Parts 1 to 4 (Clause 7.4).

Summary Table of Compliance

Rounding Rules per IS 2:1960

• If the digit dropped is less than 5, the last retained digit remains unchanged.
• If the dropped digit is exactly 5 followed only by zeros, round to the nearest even digit.
• Otherwise, increase the last retained digit by one.

flowchart TD
    A[Sampling per IS 5454] --> B{Test Results}
    B -->|Meets Criteria| C[Accept Batch]
    B -->|Does Not Meet| D[Reject Batch]
    C --> E[Report with Rounded Values]
    D --> E

This framework guarantees consistent quality evaluation and reporting for bricks.

IS 2222: Guidelines for Marking Burnt Clay Bricks

Key Directives:

• Clause 9.1: Every brick must be imprinted with the manufacturer’s identifying mark or initials in an appropriate manner.

• Clause 9.1.1: Bricks may optionally bear the BIS Standard Mark to indicate certification.

• Rounding of Test Data: Test or analysis results need to be rounded as per IS 2:1960, retaining the original significant digits.

Purpose of Marking

• Facilitates traceability to the brick producer.
• Confirms adherence to IS 2222 quality standards.
• The Standard Mark signals BIS approval and quality assurance.

Cross-reference Table (Clause 2.1 Annex A)

Process Flow Diagram

flowchart TD
    A[Brick Production] --> B[Mark with Manufacturer ID]
    B --> C{Certified by BIS?}
    C -- Yes --> D[Apply Standard Mark]
    C -- No --> E[No Standard Mark]
    D & E --> F[Bricks Ready for Distribution]

Summary: Manufacturer identification marking is mandatory, with the BIS Standard Mark applied if certification is obtained, supporting quality control and traceability.