Bamboo-Jute Composite Corrugated and Semi-Corrugated Sheets - Specification

IS 15972: Scope - Key Specifications & Tables

1. Dimensions & Tolerances (Clause 6.1, Table 1)

• Thickness measured as mean of 6 readings (excluding valleys).
• Corrugation depth measured on 6 corrugations; semi-corrugated on 2 central corrugations.
• Pitch tolerance over multiple pitches (6 for corrugated, 3 for semi-corrugated).

2. Sampling & Acceptance (Clause 9.1.2.1, Table 3)

• Lot accepted if defectives ≤ acceptance number.

3. Density Test (Annex B)

• Specimens: 300×300 mm, conditioned at 65±5% RH, 27±2°C until mass constant.
• Thickness & length measured as average of 6 readings.
• Mass measured to ±1 g accuracy.

flowchart TD
    A[Start: Sheet Production] --> B[Measure Thickness (6 readings)]
    B --> C{Corrugated or Semi-c

IS 15972 - Referenced Standards & Key Specifications

1. Referenced Indian Standards (Annex A)

2. Method of Test and Calculation of Density (Annex B)

• Specimen size: 300 mm × 300 mm, conditioned at 65 ± 5% RH and 27 ± 2 ℃.
• Conditioning: Constant mass reached when two weighings 2 h apart differ ≤ 0.1%.
• Measurements:
  • Thickness: Average of 6 random readings (excluding valley portions).
  • Length: Average of 6 random readings.
• Weighing accuracy: ±1 g.

3. Rounding Off (IS 2:1960)

• Final test values rounded to the same decimal places as specified values.
• Follow "Rules for rounding off numerical values" for compliance.

flowchart TD
    A[Specimen Preparation] --> B[Conditioning at 65±5% RH, 27±2℃]
    B --> C[Weigh Specimen (±1g)]
    C --> D[Measure Thickness (6 readings avg.)]
    C --> E[Measure Length (6 readings avg.)]
    D & E --> F[Calculate Density]
    F --> G[Round off per IS 2:1960]

Note: Always verify the latest editions of referenced IS standards for current provisions.

IS 15972: Definitions & Key Specifications Summary

• Definitions: Adopted from IS 707, IS 13958, IS 15476 (timber, bamboo mat boards, corrugated sheets standards).

1. Dimensions & Tolerances (Clause 6.1, Table 1)

• Thickness measured as mean of 6 readings (excluding valleys).
• Depth measured with depth gauge on 6 corrugations (corrugated) or 2 central corrugations (semi-corrugated).
• Pitch tolerance over 6 pitches (corrugated) or 3 pitches (semi-corrugated).

2. Sampling & Acceptance Criteria (Clause 9.1.2.1, Table 3)

• Lot accepted if defectives ≤ acceptance number; else rejected.

3. Density Test Method (Annex B)

• Specimens: 300×300 mm, conditioned at 65±5% RH, 27±2°C until mass variation <0.1% over 2 hrs.
• Weigh accuracy: ±1 g.
• Thickness & length: average of 6 random readings.

Visual Concept: Corr

IS 15972: Materials - Key Formulas, Tables, and Specifications

1. Dimensions & Tolerances (Table 1, Clause 6.1)

• Thickness measured as mean of 6 random readings (except valleys).
• Depth measured with a depth gauge on corrugations.
• Pitch tolerance measured over 6 pitches (corrugated) or 3 pitches (semi-corrugated).

2. Material Properties & Requirements (Table 2, Clause 9.1.2.2)

IS 15972: Manufacturing Process - Key Specifications & Tables

1. Dimensions & Tolerances (Clause 6.1, Table 1)

• Thickness measured as mean of 6 readings (except valleys).
• Corrugation depth measured with depth gauge on 6 corrugations (2 for semi-corrugated).
• Pitch tolerance applies over 6 pitches (corrugated) or 3 pitches (semi-corrugated).

2. Sampling & Acceptance Criteria (Clause 9.1.2.1, Table 3)

• Lot passes if defectives ≤ acceptance number.
• Random sampling per IS 4905.

3. Density Measurement (Annex B)

• Specimens: 300×300 mm, conditioned at 65±5% RH, 27±2°C until constant mass.
• Thickness & length: average of 6 random readings.
• Weight accuracy: ±1 g.

Summary Diagram: Manufacturing Quality Control Flow

flowchart TD

IS 15972: Dimensions and Tolerances for Corrugated & Semi-Corrugated Sheets

Key Dimensions & Tolerances (Table 1, Clause 6.1 & 6.2)

Measurement Notes:

• Thickness: Mean of 6 random width-wise measurements (excluding valleys).
• Depth: For corrugated, measure 6 corrugations; for semi-corrugated, measure 2 central corrugations.
• Pitch: Measure total length over 6 pitches (corrugated) or 3 pitches (semi-corrugated).

Sampling & Acceptance (Clause 9.1.2.1, Table 3)

Lot acceptance: Number of defective sheets ≤ acceptance number.

flowchart TD
    A[Measure Thickness] --> B[Mean of 6 random points]
    C[Measure Depth] --> D[6 corrugations (corrugated)]
    C --> E[2 central corrugations (semi-corrugated)]
    F[Measure Pitch] --> G[6 pitches total length (corrugated)]
    F --> H[3 pitches total

IS 15972: Appearance and Surface Quality — Key Points

1. Surface Quality Requirements (Clause 7.1)

• Sheets must have a reasonably smooth surface.
• No blisters or cracks are allowed.

2. Inspection Procedure (Clauses 9.1.1.2 & 9.1.1.3)

• All sheets in the lot inspected for surface finish.
• Defective sheets (blisters, cracks, poor finish) are removed.
• Dimensional checks done on a random sample per Table 3.

3. Sampling & Acceptance Criteria (Table 3)

• Lot acceptance: Number of defectives ≤ Acceptance Number.
• If exceeded, lot is rejected without further testing.

4. Random Sampling

• Follow IS 4905 for randomness in sample selection.

flowchart TD
    A[Start: Lot of Sheets] --> B[Inspect all sheets for surface defects]
    B -->|Defective sheets found| C[Remove defective sheets]
    B -->|No defects| D[Proceed to dimensional sampling]
    C --> D
    D --> E[Select sample size as per Table 3]
    E --> F[Check dimensional requirements]
    F -->|Defectives ≤ Acceptance Number| G[Accept Lot]
    F -->|Defectives > Acceptance Number| H[Reject Lot]

Summary: Ensure smooth, crack-free sheets. Inspect all for surface finish, remove defects, then sample dimensionally per Table 3. Accept or reject lot based on acceptance numbers.

IS 15972: Tests and Requirements - Key Points

1. Type Tests (Clause 8.1.2 & 9.2)

• Samples: 3 sheets per type test.
• Tests: As per Clause 8.1.2 and requirements in Table 2.
• Compliance: All 3 samples must meet the criteria.

2. Sampling and Criteria for Conformity (Clause 9 & Table 3)

• Defective Criteria:
  • If defective sheets ≤ acceptance number → Lot accepted.
  • If defective sheets > acceptance number → Lot rejected without further testing.

3. Dimensional Requirements (Clause 9.1.2.1)

• Sheets failing dimensional checks are defective.
• Lot acceptance depends on number of defective sheets vs acceptance number.

Summary Diagram:

flowchart TD
    A[Start: Lot Received] --> B[Select Samples as per Table 3]
    B --> C{Test Dimensional Requirements}
    C -->|Defectives ≤ Acceptance Number| D[Lot Accepted]
    C -->|Defectives > Acceptance Number| E[Lot Rejected]
    D --> F[Test Other Requirements]
    F --> G{All Samples Pass?}
    G -->|Yes| H[Lot Fully Accepted]
    G -->|No| E

Use Table 3 for sampling and acceptance criteria.
Refer to Table 2 for test specifics (not provided here).

IS 15972: Sampling and Criteria for Conformity (Clause 9)

Key Points & Table Summary

• Sampling is based on lot size with two different sample sizes:

  • For Dimensional Requirements (col 3)
  • For Other Requirements (col 5)

• Acceptance Number (col 4) defines max defectives allowed for lot acceptance.

Procedure:

1. Dimensional check:

   • Sample size as per col 3.
   • If defectives ≤ acceptance number → proceed.
   • Else → reject lot immediately.

2. Other tests (Acceptance tests as per Clause 8.1.1 and Table 2):

   • Sample size as per col 5.
   • If any sample fails → double the sample size and retest.
   • If any retested sample fails → reject entire lot.

Summary Formula for Lot Acceptance (Dimensional):

[ \text{Accept Lot if } D \leq A ]

Where:

• (D) = Number of defective sheets found
• (A) = Acceptance number from Table 3 (col 4)

This ensures quality control by statistically validating lot conformity before acceptance.

IS 15972: Marking and Certification for Bamboo-Jute Composite Sheets

Key Specifications (Clause 10.1 & 10.2)

• Marking Location: Rear side near one edge (Clause 10.1.1)
• Marking Details on Each Sheet (Clause 10.1):
  • Manufacturer's name or trademark
  • Nominal dimensions (length, width, thickness)
  • Year of manufacture
  • Batch number
• BIS Standard Mark (Clause 10.2):
  • May be applied following BIS Act 1986 provisions
  • License conditions governed by BIS rules

Method of Density Test (Annex B)

Summary Table for Marking

flowchart LR
    A[Start] --> B[Specimen Preparation]
    B --> C[Condition at 65±5% RH, 27±2℃]
    C --> D[Weigh Specimens]
    D --> E[Measure Thickness & Length]
    E --> F[Calculate Density]
    F --> G[Mark Sheet as per Clause 10.1]
    G --> H[Apply BIS Mark (if licensed)]
    H --> I[End]

This ensures traceability and quality compliance per IS 15972.

IS 15972: List of Referenced Indian Standards & Key Specifications

1. List of Referenced Indian Standards (Annex A)

2. Method of Test & Calculation of Density (Annex B)

• Specimen Size: 300 mm × 300 mm
• Conditioning: At 65 ± 5% RH and 27 ± 2 ℃ until constant mass (mass difference < 0.1% after 2h interval)
• Weighing Accuracy: ±1 g
• Dimension Measurement:
  • Thickness: Average of 6 random readings (avoid valley portion)
  • Length: Average of 6 random readings

3. Certification Marking (Clause 10.2.1)

• Use of Standard Mark per BIS Act, 1986.
• License conditions available from BIS.

flowchart TD
    A[Specimen Preparation] --> B[Conditioning at 65±5% RH, 27±2℃]
    B --> C[Weigh Specimen (±1g)]
    C --> D[Measure Thickness & Length (6 readings each)]
    D --> E[Calculate Density]

This summary provides you the essential IS references, specimen preparation, conditioning, and measurement protocols as per IS 15972. For detailed procedures, always refer to the full IS documents.

IS 15972: Method of Test and Calculation of Density

Specimen Preparation (Annex B)

• Specimen size: 300 mm × 300 mm
• Conditioning: At 65 ± 5% RH and 27 ± 2 ℃ until constant mass (two weighings 2 h apart differ ≤ 0.1%)
• Weighing accuracy: 1 g

Dimension Measurement

• Thickness: Average of 6 random readings (excluding valley portions)
• Length: Average of 6 random readings
• Width: Average of 6 random readings, multiplied by:
  • 1.1 for semi-corrugated sheets
  • 1.3767 for corrugated sheets (sinusoidal corrugations)

Density Calculation Formula

[ \text{Density} = \frac{\text{Mass (g)}}{\text{Length (cm)} \times \text{Width (cm)} \times \text{Thickness (cm)}} ]

Density Requirement (Table 2)

Notes

• Use IS 2:1960 for rounding off results to match specified significant figures.
• Density is a critical quality parameter for Bamboo Jute Composite sheets.

flowchart TD
    A[Specimen 300x300 mm] --> B[Condition at 65±5% RH, 27±2℃]
    B --> C[Weigh to 1g accuracy]
    C --> D[Measure Thickness, Length, Width (6 readings each)]
    D --> E[Adjust Width for corrugation factor]
    E --> F[Calculate Density = Mass / (L × W × T)]

This ensures consistent, standardized density measurement per IS 15972.

IS 15972: Resistance to Impact Test - Key Points

1. Requirement

• Resistance to impact: To pass the test (No quantitative value; qualitative pass/fail).

2. Test Samples

• Three samples of sheets are tested as per Clause 9.2.
• Samples must comply with all requirements in Table 2.

3. Related Properties in Table 2 (Annex C)

4. Density Calculation (Clause 1.1 c)

• Width = Average of 6 readings × correction factor:
  • Semi-corrugated: × 1.1
  • Corrugated (sinusoidal): × 1.3767
• Density = Mass / (Length × Corrected Width × Thickness)

5. Test Method References

• Impact test details are in Annex C (Table 2, Sl No. v).
• Load bearing, water absorption, and fire tests refer to IS 15476.
• Frost resistance refers to IS 5913.

Summary Diagram of Testing Process

flowchart TD
    A[Sample Preparation] --> B[Conditioning at 65±5% RH, 27±2°C]
    B --> C[Measure Dimensions]
    C --> D[Calculate Density]
    D --> E[Conduct Impact Test]
    E --> F{Pass/Fail}
    F -- Pass --> G[Conforms to IS 15972]
    F -- Fail --> H[Reject Sample]

Note: The standard does not provide a numeric impact strength value; the sheet

IS 15972: Resistance to Boiling Water Test - Key Specifications

Per Clause 9.1.2.2 and Table 2 for Bamboo Jute Composite Sheets:

Test Procedure Summary (Annex D):

• Samples are boiled in water for a specified duration (usually 2 hours).

• Measure water absorption (%) as:

  [ \text{Water Absorption} = \frac{W_{\text{wet}} - W_{\text{dry}}}{W_{\text{dry}}} \times 100 ]

• Measure thickness increase (%) as:

  [ \text{Thickness Increase} = \frac{T_{\text{wet}} - T_{\text{dry}}}{T_{\text{dry}}} \times 100 ]

• Both values must be within the specified limits.

Additional Notes:

• Test ensures durability against boiling water exposure.
• Samples must not show delamination or structural failure.
• Refer to IS 15476 for detailed test methods on water absorption and related properties.

flowchart TD
    A[Dry Sample] --> B[Boil in Water]
    B --> C[Measure Weight & Thickness]
    C --> D[Calculate % Water Absorption]
    C --> E[Calculate % Thickness Increase]
    D & E --> F{Within Limits?}
    F -->|Yes| G[Pass Test]
    F -->|No| H[Fail Test]

This test is mandatory for type approval as per Clause 9.2.

Committee Composition (IS 15972 - Annex E)

The Committee for formulation of IS 15972 is the Wood and Other Lignocellulosic Products Sectional Committee, CED 20. It includes representatives from: