non-load bearing gypsum partition blocks (solid and hollow types)

IS 2849 - Scope and Key Specifications

Scope (Summary)

• IS 2849 covers concrete blocks for masonry.
• Definitions align with IS 2469-1976.
• Products must comply with quality, inspection, and testing under ISI certification.

Key Tables & Specifications

Units and Definitions (SI Units)

• Length: metre (m)
• Mass: kilogram (kg)
• Time: second (s)
• Force: newton (N) = 1 kg·m/s²
• Pressure/Stress: pascal (Pa) = 1 N/m²

Summary Diagram of Sampling Process

flowchart TD
    A[Lot Size] --> B{Size Category}
    B -->|Up to 100| C[Sample 8 blocks for dimensions, 3 for strength]
    B -->|101-300| D[Sample 13 blocks for dimensions, 5 for strength]
    B -->|301-500| E[Sample 20 blocks for dimensions, 7 for strength]
    B -->|501+| F[Sample 32 blocks for dimensions, 10 for strength]
    C --> G{Acceptance Number = 0}
    D --> H{Acceptance Number = 0}
    E --> I{Acceptance Number = 1}
    F --> J{Acceptance Number = 2}

Note: For detailed definitions and testing procedures, refer to IS 246

IS 2849 - Definitions & Key Specifications

1. Definitions:

• Refer to IS 2469:1976 for all relevant definitions related to concrete blocks.

2. ISI Certification Mark (Clause 9.1.1):

• Marks blocks confirming compliance with IS standards.
• Ensures quality via inspection, testing, and continuous ISI surveillance.

3. Units (SI System):

4. Sampling (Clause 7.4.1):

Summary Diagram: ISI Mark & Sampling Process

flowchart TD
    A[Manufacture Concrete Blocks] --> B{Quality Check}
    B -->|Pass| C[Apply ISI Mark]
    B -->|Fail| D[Reject Batch]
    C --> E[Sampling as per Lot Size]
    E --> F{Dimensional & Strength Tests}
    F -->|Accept| G[Blocks Ready for Use]
    F -->|Reject| D

This ensures blocks conform to IS 2849 quality and dimensional standards.

IS 2849: Key Formulas, Tables & Specifications for Materials

Sampling (Clause 7.4.1, Table 2)

• Acceptance Number: Maximum allowable defective units in the sample for lot acceptance.
• Sampling ensures quality control for dimensional and strength parameters.

Units & Definitions (SI Units)

Testing & Quality Control

• Tests per IS 2542 (Part 2/Sec 1 to 8)-1981 for gypsum plaster, concrete, and products.
• Visual examination followed by dimensional and compressive strength tests as per sampling plan.
• ISI Certification Mark indicates compliance with IS standards and continuous quality monitoring.

Summary

• Use Table 2 for sample sizes and acceptance criteria.
• Follow SI units for all measurements.
• Conduct tests as per IS 2542 for confirming material properties.
• ISI marking assures conformity and quality control.

flowchart TD
    A[Lot of Blocks] --> B[Visual Examination]
    B --> C{Lot Size?}
    C -->|Up to 100| D[Sample 8 blocks (Dimensional), 3 blocks (Strength)]
    C -->|101-300| E[Sample 13 blocks (Dimensional), 5 blocks (Strength)]
    C -->|301-500

IS 2849: Type and Shape of Gypsum Blocks

Clause 4.1 - Type and Shape:

• Blocks can be solid or hollow.
• Must be truly rectangular with:
  • Straight, square edges
  • True, flat surfaces
• Special shapes allowed only if agreed and conform to all standard requirements.

Key Specifications:

Sampling for Dimensional & Compressive Strength (Clause 7.4.1)

• Defective block: Fails dimensional requirements.
• Lot acceptance: Defectives ≤ acceptance number.

Summary Diagram of Block Types

graph TD
    A[Gypsum Blocks] --> B[Solid Type]
    A --> C[Hollow Type]
    A --> D[Special Shapes (if agreed)]
    B --> E[Rectangular shape]
    C --> E
    D --> E
    E --> F[Straight edges]
    E --> G[Square corners]
    E --> H[True surfaces]

This ensures gypsum blocks meet dimensional accuracy and shape quality per IS 2849.

IS 2849: Key Requirements Summary

1. Sampling Requirements (Clause 7.4.1, Table 2)

• Acceptance Number: Maximum allowable defective units in the sample.

2. General Requirements (Clause 9.1)

• Blocks may be marked with the ISI Certification Mark ensuring compliance with quality and inspection standards.

3. Units and Definitions (SI Units)

Notes:

• Sampling ensures quality control for dimensional and strength criteria.
• ISI mark guarantees product conformity.
• Use SI units for all measurements and calculations.

flowchart TD
    A[Lot Size] --> B{Sample Size for Dimensional Req.}
    A --> C{Sample Size for Compressive Strength}
    B --> D[Acceptance Number]
    C --> D

This diagram shows the sampling process flow based on lot size and acceptance criteria.

IS 2849: Methods of Test - Key Points

1. Reference Standard for Tests

   • Tests for requirements in Clauses 5.1 & 5.3 follow IS 2542 (Part 2/Sec 1 to 8)-1981 (Gypsum products testing methods).

2. Sampling Procedure (Clause 7.3 & 7.4.1)

   • Visual inspection first, then dimensional testing.
   • Sample size depends on lot size as per Table 2 below.

3. Table 2: Sample Size and Acceptance Criteria

4. Acceptance Criteria (Clause 7.4.2)
   • After dimensional conformity, test compressive strength on sample size from col 4.
   • Lot accepted if no defective found in compressive strength tests.

Summary Flowchart of Testing Procedure:

flowchart TD
    A[Start: Lot Received] --> B[Visual Examination]
    B --> C{Dimensional Test}
    C -->|Pass| D[Compressive Strength Test]
    C -->|Fail| E[Reject Lot]
    D -->|No Defect| F[Accept Lot]
    D -->|Defect Found| E

Use IS 2542 Part 2 for detailed test methods and follow sampling sizes & acceptance numbers strictly for quality control compliance.

IS 2849 Sampling Key Points

Sampling Procedure (Clause 7.3.1 & 7.4.1)

• Blocks are selected randomly from the lot (use IS 4905-1968 for randomness).
• Sample size depends on lot size (see Table 2).
• Dimensional requirements tested on all sampled blocks.
• A block failing dimensional specs = defective.
• Lot acceptance based on number of defectives ≤ acceptance number.

Table 2: Sample Size & Acceptance Number

Additional Notes (Clause 8.2)

• Independent tests can be done before or after delivery.
• Tests must follow IS 2849 specifications.

flowchart TD
    A[Lot of Blocks] --> B[Random Sampling per IS 4905]
    B --> C{Test Dimensional Requirements}
    C -->|Defectives ≤ Acceptance Number| D[Lot Accepted]
    C -->|Defectives > Acceptance Number| E[Lot Rejected]
    B --> F[Test Compressive Strength on sample]

This ensures quality control via statistically valid sampling and acceptance criteria.

IS 2849: Inspection and Certification Key Points

1. Inspection & Certification (Clause 9.1.1)

• Each block may be marked with the ISI Certification Mark.
• ISI Mark indicates compliance with the standard under ISI-supervised inspection, testing, and quality control.
• Continuous ISI checks ensure conformity.
• Licensing for ISI Mark use is governed by the Indian Standards Institution (Certification Marks) Act.

2. Manufacturer's Certificate (Clause 7.4)

• Lot conformity is based on satisfying test criteria in Clauses 7.4.1 and 7.4.2.
• Manufacturer must provide a certificate confirming compliance with IS 2849.

3. Units & Symbols (International System of Units)

Summary Diagram of Certification Process

flowchart TD
    A[Manufacturer Production] --> B[Inspection & Testing]
    B --> C{Conforms to IS 2849?}
    C -- Yes --> D[Manufacturer's Certificate Issued]
    D --> E[ISI Certification Mark Granted]
    C -- No --> F[Reject Lot / Reprocess]

For detailed licensing conditions and testing criteria, contact ISI offices listed in IS 2849.

IS 2849 - Marking Specifications (Clause 9.1 & 9.1.1)

Each concrete block shall be clearly and permanently marked with:

• Manufacturer's name or trade-mark
• Size of the block
• Year of manufacture

Additionally, the block may be marked with the ISI Certification Mark under the Indian Standards Institution (Certification Marks) Act, which ensures compliance with the standard through inspection and quality control.

Key Points on Marking:

International System of Units (SI Units) used in IS 2849:

Summary Diagram of Marking Elements

graph LR
A[Concrete Block] --> B[Manufacturer's Name/Trade-mark]
A --> C[Size of Block]
A --> D[Year of Manufacture]
A --> E[ISI Certification Mark (Optional)]

For detailed licensing and use of ISI mark, refer to the Indian Standards Institution rules.

IS 2849: Optional Requirements for ECO Mark (Clause 9)

• By-product gypsum used in plaster must conform to IS 12679:1987 (Clause 3.1).

• Environmental Compliance (Clause 9.1.2):
  Manufacturers must submit:

  • Consent clearance from State Pollution Control Board under:
    • Water (Prevention and Control of Pollution) Act, 1974
    • Air (Prevention and Control of Pollution) Act, 1981
    • Water Cess Act, 1977
  • Authorization under Environment (Protection) Act, 1986 (if applicable)
  • Compliance with Forest Department rules

• Product Labeling (Clause 9.1.3):
  The product or packaging may display brief criteria justifying its environment-friendly label.

Summary Table for ECO Mark Compliance

This ensures plaster products meet environmental safety and sustainability standards under IS 2849 for ECO Mark certification.