sandstone (slabs and tiles)

IS 3622: Scope & Sampling for Slabs/Tiles

Scope:

• Applies to testing slabs/tiles for general requirements and dimensions.
• Compliance values rounded per IS 2-1960 rules (same significant figures as specified).

Sampling & Conformity (Clauses 6.2, 6.3, 6.4):

• Sampling: Random selection (use random number tables per IS 4905-1968).
• Defective Criteria: Any slab/tile failing general or dimensional requirements is defective.
• Acceptance: Lot accepted if defectives ≤ permissible number.

Key Notes:

• Sampling ensures quality control without testing entire lot.
• Sub-sample size is for detailed tests if needed.
• Rounding follows IS 2-1960 for consistency.

flowchart TD
    A[Lot of slabs/tiles] --> B[Random Sampling per Table 2]
    B --> C{Check General & Dimensional Requirements}
    C -->|Pass| D[Accepted]
    C -->|Fail| E[Count Defectives]
    E --> F{Defectives ≤ Permissible?}
    F -->|Yes| D
    F -->|No| G[Reject Lot]

IS 3622: General Requirements for Sandstone Slabs/Tiles

1. Sampling & Inspection (Clause 6.3 & Table 2)

• Number of slabs/tiles selected: As per Column 2 of Table 2 (sampling size based on lot size).
• Permissible number of defectives: Given in Column 3 of Table 2.
• Defect criteria: Any slab/tile failing in general requirements or dimension checks is defective.
• Lot acceptance: Lot conforms if defectives ≤ permissible number.

2. Physical Properties (Clause 4.1, Table 1)

3. Rounding Off (Clause 0.4)

• Test results should be rounded as per IS 2:1960 to the same decimal places as specified values.

Summary Diagram: Sampling & Acceptance

flowchart TD
    A[Select slabs/tiles as per Table 2] --> B[Inspect for general requirements & dimensions]
    B --> C{Defective?}
    C -- No --> D[Count as OK]
    C -- Yes --> E[Count as defective]
    D & E --> F[Compare defectives with permissible limit]
    F --> G{Defectives ≤ permissible?}
    G -- Yes --> H[Lot Accepted]
    G -- No --> I[Lot Rejected]

This ensures quality compliance for sandstone slabs/tiles in flooring, roofing, and face work.

IS 3622: Dimensions of Rough Cut Sandstone Slabs and Tiles (Clause 3.1)

• Note: Sizes between specified increments are rounded down to the next lower size.
• Thickness Tolerance (Clause 3.1.1): ±3 mm.

Rounding Off (Clause 0.4)

• Results must be rounded as per IS 2-1960, maintaining the same number of significant figures as the specified values.

Quality Control (Clause 6.3)

• Slabs/tiles are sampled per Table 2 (not shown here).
• Defective units: Any slab/tile failing dimension or general requirements.
• Lot acceptance: Number of defectives ≤ permissible defectives in Table 2.

flowchart TD
    A[Select Lot of Slabs/Tiles] --> B[Sample as per Table 2]
    B --> C[Check Dimensions & General Requirements]
    C --> D{Defective?}
    D -- Yes --> E[Count Defectives]
    D -- No --> F[Accept Sample]
    E --> G{Defectives ≤ Permissible?}
    G -- Yes --> F
    G -- No --> H[Reject Lot]

This ensures slabs/tiles meet size and quality standards per IS 3622.

IS 3622: Physical Properties of Sandstone Slabs (Clause 4.1 & Table 1)

Key Notes:

• Slabs must be tested sequentially: transverse strength → water absorption → durability → abrasion.
• Samples passing all tests confirm conformity.
• Dimensions tolerance for machine-cut slabs:
  • Length & breadth: ±1 mm
  • Thickness: ±3 mm (Clause 3.2)

Summary:

• Water Absorption: Controls porosity and durability.
• Transverse Strength: Ensures mechanical strength.
• Wear Resistance: Measures surface hardness.
• Durability: Assesses long-term performance.

flowchart LR
    A[Sample Selection] --> B[Transverse Strength Test]
    B --> C[Water Absorption Test]
    C --> D[Durability Test]
    D --> E[Resistance to Wear Test]
    E --> F{Pass All?}
    F -- Yes --> G[Accept Lot]
    F -- No --> H[Reject Lot]

This ensures sandstone slabs meet quality for flooring, roofing, and facings per IS 3622.

IS 3622: Marking & Sampling Key Points

Marking (Clause 5.1)

• Each type of sandstone slab/tile shall be marked with the manufacturer's identification mark or initials.
• Marking must be clear and durable for traceability.

Sampling & Criteria for Conformity (Clause 6.2, 6.4)

• Random sampling is essential; use random number tables (IS 4905-1968) for selection.
• Sample size and sub-sample size depend on the lot size as per Table 2 below:

• Sub-samples are tested for transverse strength, water absorption, durability, and abrasion.
• Lot passes if no slab/tile fails any physical property test.

Rounding Off (Clause 0.4)

• Test results should be rounded off according to IS 2-1960.
• Retain significant digits equal to those specified in the standard.

flowchart TD
    A[Lot of slabs/tiles] --> B[Random Sampling (Table 2)]
    B --> C[Physical Tests on Sub-sample]
    C --> D{Any failure?}
    D -- No --> E[Lot Accepted]
    D -- Yes --> F[Lot Rejected]

This ensures quality control and traceability per IS 3622.

IS 3622: Sampling & Criteria for Conformity Summary

Sampling Procedure (Clause 6.2.1)

• Slabs/tiles selected randomly using random number tables (see IS:4905-1968).
• Sampling is done per lot.

Sample Size & Acceptance Criteria (Table 2)

Criteria for Conformity (Clause 6.3 & 6.4)

• Examine all sampled slabs/tiles for general requirements and dimensions.
• Lot is accepted if defectives ≤ permissible number.
• For physical properties, test the sub-sample for:
  • Transverse strength
  • Water absorption
  • Durability
  • Abrasion
• Lot passes physical tests if no failures in sub-sample.

flowchart TD
    A[Select Lot] --> B[Random Sampling per Table 2]
    B --> C[Check General Requirements & Dimensions]
    C -->|Defectives ≤ Permissible| D[Select Sub-sample]
    C -->|Defectives > Permissible| E[Reject Lot]
    D --> F[Test Physical Properties]
    F -->|No Failures| G[Accept Lot]
    F -->|Failures| E

Note: Sampling and testing ensure quality control per IS 3622 for slabs/tiles.