gypsum plaster boards, Part 3: Reinforced Gypsum plasterboards

IS 2095 (Part 3): 1996 — Scope Overview

This part of IS 2095 covers specifications for asbestos-cement boards, focusing on their dimensions, properties, and quality control.

Key Clauses:

• Clause 3.1 (Definitions): Defines terms related to asbestos-cement boards for clarity.

• Clause 6.2 (Dimensions): Specifies length, width, and thickness as per Table 1.

• Clause 10.1 (General Requirements): Covers general quality and performance criteria.

• Clause 10.2 (Specific Requirements): Details additional technical requirements for boards.

Table 1: Typical Dimensions (as per Clause 6.2)

Note: Actual table values should be confirmed from the standard.

General Notes:

• Boards must meet mechanical strength, water absorption, and fire resistance criteria.
• Thickness tolerance and dimensional stability are critical.
• Quality tests include flexural strength and impact resistance.

flowchart LR
    A[IS 2095 Part 3] --> B[Definitions (Clause 3.1)]
    A --> C[Dimensions (Clause 6.2)]
    C --> D[Length, Width, Thickness (Table 1)]
    A --> E[General Requirements (Clause 10.1)]
    A --> F[Specific Requirements (Clause 10.2)]

For detailed formulas or test methods, refer directly to IS 2095 Part 3 text.

IS 2095 (Part 3): Key Formulas, Tables & Specs

1. Dimensions & Properties (Clause 6.2, 6.3, Table 1)

2. Mechanical Strength (Clause 8.3.2, Table 2)

3. Test Procedure (Clause 1.1, Table B-1)

• Indentation Test:
  • Steel ball diameter: 10 mm
  • Load: 150 N
  • Duration: 5 minutes on undamaged board surface
  • Measure diameter of impression after removal.

Notes:

• Length, width, and thickness must conform to Table 1.
• Mass of plaster varies with board thickness and type.
• GRG boards have higher density and strength than fibrous gypsum boards.
• Refer to IS 2095 Part 3 for detailed test methods and quality control.

flowchart TD
    A[Start] --> B[Select Board Type]
    B --> C{Fibrous Gypsum or GRG?}
    C -->|Fibrous Gypsum| D[Use Table 1 Dimensions & Density]
    C -->|GRG| E[Use Table 1 Dimensions & Density]
    D --> F[Check Flexural & Impact Strength (Table 2)]
    E --> F
    F --> G[Test Indentation (Clause 1.1)]
    G --> H[Quality Compliance]
    H --> I[

IS 2095 Part 3: Key Definitions, Dimensions & Properties

Definitions (Clause 3.1)

• Standard terms related to fibrous gypsum plaster board and Glass Reinforced Gypsum (GRG) board as per IS 2095 Part 3 apply.

Dimensions & Specifications (Clause 6.2, Table 1)

Mechanical Properties (Clause 8.3.2, Table 2)

Summary:

• Board sizes vary by type; fibrous gypsum boards have fixed thickness 12 mm, GRG boards range 4-12 mm.
• Density: Fibrous gypsum ~834 kg/m³, GRG ~2500 kg/m³.
• Strength: Flexural strength ≥15 MPa minimum; Impact strength ≥14 Nmm/mm² minimum.

This ensures compliance with IS 2095 Part 3 for quality and performance of gypsum boards.

IS 2095 Part 3: Materials Key Data

1. Dimensions & Properties of Boards (Clause 6.2 & Table 1)

2. Mechanical Properties (Clause 8.3.2, Table 2)

3. Surface Hardness Test (Clause 8.6 & Annex B)

• Test: Steel ball (Ø 10 mm, load 150 N) pressed for 5 min.
• Maximum impression diameter ≤ 8 mm.

Summary:

• Use Table 1 for board dimensions and densities.
• Check Table 2 for flexural and impact strength minimums.
• Surface hardness ensures durability with max 8 mm indentation.

flowchart TD
    A[Material Selection] --> B[Check Dimensions & Density (Table 1)]
    B --> C[Verify Flexural & Impact Strength (Table 2)]
    C --> D[Conduct Surface Hardness Test]
    D --> E{Impression ≤ 8 mm?}
    E -- Yes --> F[Material Accepted]
    E -- No --> G[Material Rejected]

This concise data helps ensure compliance with IS 2095 Part 3 for gypsum and GRG boards.

IS 2095 Part 3: Types of Reinforced Gypsum Boards

1. Types:

• Fibrous Gypsum Plaster Board
• Glass Reinforced Gypsum (GRG) Board

2. Key Specifications (from Table 1):

3. Mechanical Properties (Table 2):

4. Definitions:

• Fibrous Gypsum Board: Gypsum plaster reinforced with fibrous material.
• GRG Board: Gypsum plaster reinforced with glass fibers, enhancing strength and durability.

Summary:

• GRG boards have higher density (~2500 kg/m³) and better flexural & impact strength than fibrous boards.
• Thickness varies from 4.6 mm to 12 mm for GRG boards.
• Length and width are standardized for ease of installation.

flowchart TD
    A[Gypsum Boards] --> B[Fibrous Gypsum Board]
    A --> C[Glass Reinforced Gypsum (GRG) Board]
    B --> D[Thickness: 12 mm]
    B --> E[Density: 834 kg/m³]
    C --> F[Thickness: 4.6 - 12 mm]
    C --> G[Density: 2500 kg/m³]
    C --> H[Flexural Strength: 15-18 MPa]
    C --> I[Impact Strength: 14-17 Nmm/mm²]
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IS 2095 Part 3 (1996) – Dimensions and Tolerances Summary

1. Dimensions (Clause 6.2 & Table 1)

2. Tolerances (Clause 6.5)

• Length: +0 mm (no positive tolerance)
• Width: +0 mm (no positive tolerance)

3. Mechanical Properties (Table 2 - Clause 8.3.2)

Notes:

• Thickness, length, and width are strictly controlled for quality.
• Mass of plaster per m² increases with thickness.
• GRG boards have higher density and strength due to glass fiber reinforcement.
• No positive tolerance means actual size cannot exceed specified dimensions.

flowchart LR
    A[Board Type] --> B[Thickness (mm)]
    B --> C[Length (mm)]
    C --> D[Width (mm)]
    D --> E[Mass of Plaster (kg/m²)]
    E --> F[Density (kg/m³)]
    F --> G[Mechanical Properties]

For detailed design, refer to IS 2095 Part 3 Tables 1 & 2 for exact values.

IS 2095 Part 3: Appearance and Surface Quality - Key Specifications & Test

Surface Hardness Test (Clause 8.6 & Annex B):

• Test Method:

  • Use a steel ball of 10 mm diameter.
  • Apply a load of 150 N gently on the undamaged sheet surface.
  • Maintain the load for 5 minutes.
  • Remove the ball and measure the diameter of the impression.

• Acceptance Criteria:

  • Diameter of impression shall not exceed 8 mm for both materials tested.

Visual Inspection & Defect Limits (Clause 9.3.1):

• A lot passes if the number of defective pieces is within permissible limits as per Table 3 (refer IS 2095 Part 3 for exact numbers).

Jolting Test (Clause 8.4 & Annex A):

• Cut three samples 250 x 250 mm from different board areas.
• Drop each horizontally from 75 cm height onto a hard wooden table.
• Ensure no impact on edges or corners.

Summary Table for Surface Hardness Test

flowchart TD
    A[Place 10 mm steel ball on surface] --> B[Apply 150 N load]
    B --> C[Maintain load for 5 minutes]
    C --> D[Remove ball and load]
    D --> E[Measure impression diameter]
    E --> F{Diameter ≤ 8 mm?}
    F -->|Yes| G[Pass surface hardness test]
    F -->|No| H[Fail surface hardness test]

This ensures surface quality and durability per IS 2095 Part 3 requirements.

IS 2095 Part 3: Physical & Mechanical Properties Summary

1. Dimensions & Density (Clause 6.2, Table 1)

2. Flexural & Impact Strength (Clause 8.3.2, Table 2)

3. Test Methods

• Jolting Test (Clause 8.4, Annex A):
  Drop 250x250 mm sample from 75 cm height horizontally on wooden table to check durability.

• Surface Hardness Test (Clause 8.6, Annex B):
  Performed to assess surface durability (details in Annex B).

Key Notes:

• Use Table 1 for board sizing and density.
• Use Table 2 for minimum mechanical strength requirements.
• Jolting and surface hardness tests ensure board robustness.

flowchart LR
    A[Board Samples] --> B{Tests}
    B --> C[Jolting Test]
    B --> D[Flexural & Impact Strength]
    B --> E[Surface Hardness Test]
    C --> F[Drop from 75 cm]
    D --> G[Measure Flexural & Impact Strength]
    E --> H[Assess Surface Durability]

This concise summary aids in design and quality control per IS 2095 Part 3.

IS 2095 Part 3: Sampling and Inspection Key Points

• Sampling Size (Clause 9.2 & Table 3):
  Number of boards to select depends on lot size:

• Inspection Criteria (Clause 9.3.1):
  A lot is conforming if the number of defectives ≤ permissible defectives in Table 3.

• Sampling Procedure (Clause 9.1.1):
  Samples must be selected and inspected separately from each lot.

Summary Diagram: Sampling & Inspection Flow

flowchart TD
    A[Start: Identify Lot Size] --> B{Lot Size?}
    B -->|≤100| C[Select 6 Boards]
    B -->|101-150| D[Select 8 Boards]
    B -->|151-300| E[Select 13 Boards]
    B -->|301-500| F[Select 20 Boards]
    B -->|501-1000| G[Select 32 Boards]
    B -->|>1000| H[Select 50 Boards]
    C --> I[Inspect Boards]
    D --> I
    E --> I
    F --> I
    G --> I
    H --> I
    I --> J{Defectives ≤ Permissible?}
    J -->|Yes| K[Lot Conforms]
    J -->|No| L[Lot Does Not Conform]

Use this sampling plan to ensure quality compliance during inspection per IS 2095 Part 3.

IS 2095 Part 3: Packing and Marking - Key Points

Sampling & Quality Control (Clause 9.3.1, Table 3)

• Lot acceptance: All boards tested for transverse bending and surface hardness must individually pass (Clause 9.4.1).
• Packing material: Must be recyclable, reusable, or biodegradable (Clause 10.1.4).
• Dimensions: Length, width, thickness per Table 1 (Clause 6.2).

Summary

• Sampling size and defect limits depend on lot size.
• Strict individual board testing for key mechanical properties.
• Environmentally responsible packing materials mandated.
• Dimensions per standard specifications.

This ensures quality control and eco-friendly packaging in compliance with IS 2095 Part 3.

IS 2095 Part 3: Jolting Test Method Summary

Test Purpose:

• To check surface integrity of boards under repeated impact (jolting).

Key Specifications (Clause 8.4 & Annex A):

• Sample Size: 3 pieces, each 250 mm x 250 mm, cut from different board locations.
• Test Setup:
  • Hold sample horizontally at 75 cm height above a hard wooden table.
  • Drop the sample flat on the table (avoid edges/corners impact).
• Acceptance Criteria:
  • No cracks or chipping on the surface before 80 jolting cycles.

Procedure Summary:

Related Surface Hardness Test (Clause 8.6 & Annex B):

• Steel Ball Diameter: 10 mm
• Load: 150 N
• Duration: 5 minutes contact
• Max Impression Diameter: 8 mm

flowchart TD
    A[Cut 3 samples 250x250 mm] --> B[Hold horizontally 75 cm above wooden table]
    B --> C[Drop sample flat on table]
    C --> D[Repeat for 80 cycles]
    D --> E{Any crack or chipping?}
    E -- No --> F[Test Passed]
    E -- Yes --> G[Test Failed]

This test ensures durability against repeated impact, critical for structural and surface quality assurance.

IS 2095 Part 3: Surface Hardness Test Method (Clause 8.6 & Annex B)

Test Procedure (Annex B, Clause 1.1)

• Use an undamaged sheet; test at three points on the surface.
• Place a steel ball of 10 mm diameter on the surface.
• Apply a load of 150 N gently on the ball.
• Keep the load and ball in position for 5 minutes.
• Remove the load and ball; measure the diameter of the impression.

Key Specification

• The diameter of any impression shall not exceed 8 mm for both materials.

Summary Table: Surface Hardness Test

Additional Notes

• Test ensures surface resistance to indentation.
• Impression diameter > 8 mm indicates failure.
• Test is non-destructive except for minor surface marks.

flowchart TD
    A[Place steel ball (10 mm dia)] --> B[Apply 150 N load]
    B --> C[Keep for 5 minutes]
    C --> D[Remove load and ball]
    D --> E[Measure impression diameter]
    E --> F{Diameter ≤ 8 mm?}
    F -->|Yes| G[Pass Surface Hardness Test]
    F -->|No| H[Fail Surface Hardness Test]

This test is crucial for quality control of boards per IS 2095 Part 3.