Coir Faced Block Boards -Specification

IS 15877: Scope Overview

• Scope Definition: IS 15877 covers specifications and requirements for polymer pipes used in water supply, drainage, and sewerage systems. It ensures material quality, dimensions, and performance criteria.

• Rounding Off Values:
  Final test or calculation results must be rounded as per IS 2:1960, maintaining the same number of significant digits as the specified values in IS 15877.

• Reference Standards:

  • Definitions align with IS 707 (General requirements for polymer pipes).
  • Annex A lists related standards incorporated by reference; users should verify the latest editions.

• Key Points:

  • Applies to polymer pipes for potable water and drainage.
  • Ensures uniformity in testing and quality assessment.
  • Emphasizes compliance with referenced standards and proper rounding rules.

No explicit formulas or tables are in the scope clause; detailed specifications appear in subsequent sections of IS 15877.

IS 15877 References Summary

• Annex A lists all referenced standards incorporated by this code; these are integral and must be consulted for detailed provisions.
• At publication, the editions cited were current; users should verify if newer editions exist.
• Rounding off of test or analysis results must follow IS 2:1960 rules, maintaining the same number of significant digits as specified.
• Test specimens and number of tests are detailed in Clause 8.2 (refer to IS 15877 for specifics).
• Definitions primarily follow IS 707 and additional definitions within IS 15877.

Important Referenced Codes (examples from Annex A):

Rounding Off (IS 2:1960) Key Points:

• Round off to the same decimal place as the specified value.
• Use standard rounding rules (e.g., 0.5 rounds up).

flowchart LR
    A[IS 15877 Standard] --> B[Annex A: Referenced Standards]
    B --> C[IS 2: Rounding Rules]
    B --> D[IS 707: Definitions]
    A --> E[Clause 8.2: Test Specimens & Tests]

For detailed formulas or tables, consult the specific referenced standards in Annex A.

IS 15877 - Definitions Summary

• Reference Standards: Definitions primarily follow IS 707 (for PVC pipes) and IS 2:1960 for rounding rules.
• Rounding Off: Final test values must be rounded off as per IS 2:1960, keeping the same number of significant digits as the specified value.
• Length & Width (Clause 8.1.4): Specifies dimensional limits for test specimens; exact values depend on pipe size/type.
• Test Specimens & Number of Tests (Clause 8.2): Defines specimen preparation and minimum test counts to ensure reliability.

Key Points:

Practical Note:

• Always check IS 707 for detailed PVC pipe definitions.
• Use IS 2:1960 rounding for test results to maintain consistency.
• Test specimens must conform dimensionally before testing.

flowchart TD
    A[IS 15877 Definitions] --> B[IS 707 Definitions]
    A --> C[Rounding per IS 2:1960]
    A --> D[Test Specimens (8.1.4)]
    A --> E[Number of Tests (8.2)]

This ensures clarity and standard compliance in testing and reporting.

IS 15877: Materials - Key Specifications & Formulas

1. Test Specimens & Conditioning (Clauses 8.2 & 9.1)

• Specimens must be rectangular with square edges.
• Conditioning:
  • Air exposure for 24h in a ventilated room usually suffices.
  • For accuracy: condition at 27 ± 2°C and 65 ± 5% RH until mass stabilizes.

2. Mechanical Properties (Clause 9.2.5 - Table of Modulus of Rupture & Elasticity)

3. Referenced Standards (Annex A)

• IS 401: Preservation of timber
• IS 1141: Seasoning of timber
• IS 707: Timber technology glossary
• IS 7638: Sampling methods for wood panels
• IS 14842: Coir veneer board specification
• IS 9308 (Parts 2 & 3): Mechanically extracted coir fibres

Summary Diagram: Test Specimen Preparation & Testing Flow

flowchart TD
    A[Cut rectangular specimen] --> B[Condition specimen]
    B -->|27±2°C, 65±5% RH| C[Mass stabilizes]
    C --> D[Test for MOR & MOE]
    D --> E{Check values}
    E -->|≥ Min individual| F[Pass]
    E -->|< Min individual| G[Fail]

This ensures compliance with IS 15877 material requirements for coir-faced blockboards.

IS 15877: Manufacture - Key Specifications & Procedures

• Test Specimens (Clause 9.1 & 8.2.2):

  • Rectangular shape with edges cut square.
  • Size as per Clause 8.2.2 (refer IS 15877 for exact dimensions).
  • Number of tests as per Clause 8.2.

• Conditioning of Specimens (Clause 9.1):

  • Expose specimens for 24 hours in a well-ventilated room.
  • For accuracy, condition at 27 ± 2°C and 65 ± 5% RH until mass is constant.

• Rounding off Results (General Clause):

  • Follow IS 2:1960 rules.
  • Retain significant figures equal to those specified in IS 15877.

• Referenced Standards (Annex A):

  • IS 401:2001 (Timber preservation)
  • IS 1141:1993 (Seasoning of timber)
  • IS 707:1976 (Timber glossary)
  • IS 7638:1999 (Sampling wood panels)
  • IS 14842:2000 (Coir veneer board)

These ensure uniformity in manufacture, testing, and quality control of timber-based panels.

flowchart TD
    A[Cut test specimens] --> B[Condition specimens]
    B --> C{Conditioning environment}
    C -->|Room air 24h| D[Ready for test]
    C -->|27±2°C & 65±5% RH| E[Mass constant → Ready]
    D --> F[Testing]
    E --> F
    F --> G[Round off results as per IS 2:1960]

IS 15877: Preservative Treatment Key Points

1. Preservative Treatment Requirement (Clause 6.1)

• Species marked () in Annex B*, all sapwood, and non-durable species must be treated as per IS 401.
• Trimmed/cut ends of finished blockboards require protective treatment.

2. Preservative Types (Annex J)

• Common preservatives:
  • Water-soluble: Boric acid, Borax
  • Fixed-type: Copper-Chrome-Arsenic (CCA), Acid-Cupric-Chromate, Borated-Copper-Chrome, Ammoniacal-Copper-Arsenite

3. Penetration & Spot Test (Clause 9.2.6 & Annex J)

• Confirm through-and-through preservative penetration by cutting across the blockboard width.
• Spot test for chromium-containing preservatives:
  • Spray/brush bore dust or cross-section.
  • Purple color indicates chromium presence (treated portion).
  • No color = untreated.

4. Testing Conditions (Clause 1.4)

• Maintain test dish at 27 ± 2°C for 3 weeks before evaluation.

Summary Table: Preservative & Spot Test

This ensures durability and compliance for timber core blockboards per IS 15877.

IS 15877: Dimensions and Tolerances (Clause 7.3)

• Edge straightness and squareness are verified per Annex C methods.
• Dimensional changes due to humidity (Annex D) must be ≤ ±1 mm between 40% and 90% RH relative to 65% RH conditioning.
• No delamination allowed at humidity extremes.
• Local planeness change ratio:
  [ \frac{d}{L} \quad \text{where } d = \text{vertical gap}, \quad L = \text{horizontal distance} ]

Summary Diagram

flowchart TD
    A[Finished Board] --> B[Check Dimensions]
    B --> C{Within Tolerances?}
    C -- Yes --> D[Pass]
    C -- No --> E[Reject or Rework]
    D --> F[Humidity Conditioning]
    F --> G{Dimensional Change ≤ ±1 mm?}
    G -- Yes --> H[Accept]
    G -- No --> E

Reference: IS 14842 for permissible defects; Annex C for measurement; Annex D for humidity testing.

IS 15877: Sampling and Inspection Key Points

1. Sampling Method (Clause 8.1.2)

• Sampling follows IS 7638 guidelines for drawing representative samples.
• Visual inspection for surface defects per Clause 6.6.
• If any blockboard in the sample is unsatisfactory, the entire lot is rejected.

2. Tolerance Limits (Clause 7.3, Table 7.3)

• Edge straightness and squareness checked per Annex C.

3. Rounding Off (Clause 8)

• Follow IS 2:1960 for rounding off test results.
• Retain the same number of significant figures as the specified value.

Summary Diagram: Sampling & Inspection Flow

flowchart TD
    A[Draw Sample per IS 7638] --> B[Visual Inspection for Defects]
    B -->|No Defects| C[Accept Lot]
    B -->|Defects Found| D[Reject Lot]

This ensures quality control by strict sampling and inspection criteria.

IS 15877 — Key Points on Tests

1. Test Specimens & Number of Tests (Clause 8.2)

• Specimens must be rectangular with edges cut square.
• Size as per 8.2.2 (refer to the code for exact dimensions).
• Number of specimens and tests as specified in the code.

2. Preparation & Conditioning (Clause 9.1)

• Condition specimens before testing:
  • Exposure to air in a well-ventilated room for 24 hours is minimum.
  • For accuracy: Condition at 27 ± 2°C and 65 ± 5% RH until mass is constant.

3. Thickness Measurement (Clause 8.2.3)

• Measure thickness as per Annex C.
• Calculate mean thickness from multiple measurements.

Summary Table: Conditioning Parameters

Testing Setup (Clause 1.2)

• Use a stout table.
• Fix a wooden batten on the table edge to place specimen against.

flowchart LR
    A[Test Specimen Preparation] --> B[Cut Rectangular, Edges Square]
    B --> C[Conditioning]
    C --> D[Measure Thickness (Annex C)]
    D --> E[Testing on Stout Table with Wooden Batten]

This ensures reliable, repeatable test results as per IS 15877.

IS 15877: Marking and Labeling Key Points

Marking Requirements (Clause 10.2.1)

Each coir faced blockboard must be legibly and indelibly marked on any edge with:

• Source of manufacture
• Grade and type of blockboard (see table below)
• Size: length, width, thickness (in mm)
• Batch number and year of manufacture
• Criteria for ECO-Mark labeling

Grades and Types (Clause 4.3)

BIS Certification Mark (Clause 11.1.1)

• Use of the Standard Mark follows BIS Act 1986 regulations.
• Licence conditions for Standard Mark use are provided by BIS.

Summary Diagram

graph TD
  A[Coir Blockboard Edge] --> B[Marking]
  B --> C[Manufacturer Source]
  B --> D[Grade & Type (BWP-DEC etc.)]
  B --> E[Size (LxWxT)]
  B --> F[Batch & Year]
  B --> G[ECO-Mark Criteria]

This ensures traceability, quality, and environmental compliance per IS 15877.

IS 15877: Certification Marking Key Points

• Standard Mark Usage (Clause 11.1 & 11.1.1):

  • The Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
  • License for use granted by BIS under specified conditions.
  • Details available from BIS directly.

• Marking Requirements for Coir Faced Blockboard (Clause 10.2.1):
  Each blockboard edge must be marked with:

  • Source of manufacture
  • Grade and type of blockboard
  • Size: length, width, thickness (in mm)
  • Batch number and year of manufacture
  • Eco-Mark criteria if labeled environment friendly

• Rounding Off (General Clause):

  • Follow IS 2:1960 rules for rounding numerical test results to the same significant figures as specified values.

Summary Table for Marking:

flowchart LR
    A[Start: Manufacture] --> B[Assign Batch & Year]
    B --> C[Mark Source, Grade, Type]
    C --> D[Mark Dimensions (L×W×T)]
    D --> E[Mark Eco-Mark Criteria (if applicable)]
    E --> F[Final Product Packaging & Certification Mark]

This ensures traceability, quality, and compliance with BIS certification.

IS 15877 - List of Referenced Indian Standards (Key Extracts)

Important Notes:

• Definitions in IS 707 apply for timber-related terms.
• Preservation and seasoning practices are detailed in IS 401 and IS 1141 respectively.
• Sampling methods for wood-based panels are in IS 7638.
• Coir fibre and veneer specifications are in IS 9308 and IS 14842.

BIS Certification Marking (Clause 11.1.1)

• Use of the Standard Mark follows the BIS Act, 1986.
• Licensing conditions available directly from BIS.

Summary Diagram: Referenced Standards Relation

graph TD
    A[IS 15877] --> B[IS 401: Timber Preservation]
    A --> C[IS 1141: Timber Seasoning]
    A --> D[IS 707: Timber Glossary]
    A --> E[IS 7638: Panel Sampling]
    A --> F[IS 14842: Coir Veneer Board]
    A --> G[IS 9308: Coir Fibres]

For detailed provisions, consult the respective IS documents or BIS.

IS 15877: List of Timber Species for Manufacture of Coir Faced Blockboards

Clause 5.5 & Annex B specify timber species suitable for blockboard manufacture. Any suitable timber species may be used, but for ECO-Mark, only plantation or non-natural forest species are allowed.

Key Timber Species (Standard Trade Name | Botanical Name | Abbreviation)

(Marked species require preservative treatment per IS 401)

Preservative Treatment (Clause 6.1)

• Species marked with (*) and all sapwood/non-durable species must be treated as per IS 401.
• Protective treatment required on trimmed/cut ends of finished blockboards.

Summary Table of Treatment Requirement

This ensures durability and compliance with environmental guidelines for blockboard manufacture.

IS 15877: Test for Edge Straightness and Squareness

Key Specifications & Procedure (Clause C-2.1 & Annex C)

• Edge Straightness Test:

  • Place the test piece on a stout table with a wooden batten fixed along one edge.
  • Align the test specimen edge against the batten.
  • Measure deviations along the edge using a straightedge or feeler gauge.
  • Record the maximum deviation from a straight line.

• Squareness Test:

  • Check the angle between adjacent edges using a try square or protractor.
  • Measure deviation from 90°; allowable tolerance depends on product specification.

Reporting (Clause 1.2)

• Report the mean thickness of test pieces.
• Report maximum deviations in edge straightness (in mm).
• Report squareness deviation (in degrees or mm offset).

Typical Allowable Tolerances (as per IS 15877 Annex C)

Summary Diagram

flowchart LR
    A[Place test piece on table] --> B[Align edge against wooden batten]
    B --> C[Measure edge deviation with straightedge]
    C --> D[Record max deviation]
    A --> E[Check adjacent edges with try square]
    E --> F[Measure squareness deviation]
    F --> G[Record squareness deviation]

Note: Always refer to the specific product tolerance limits in IS 15877 for precise values.

IS 15877: Test for Adhesion of Plies (Clause 9.2.3 & Annex F)

Key Points:

• Purpose: To check glue adhesion between core and adjoining veneers in blockboards.
• Test Method: As per Annex F, qualitative test involves:
  • Submerging specimen in 60 ± 2°C water for 3 hours, then plunging into cold water (Clause E-1.2).
  • Applying force to separate plies and examining fractured surface.
• Evaluation: Adhesion judged by:
  • Amount of wood fibers adhering to core veneer.
  • Area peeled off.
  • Force required for separation (qualitative).
• Grading:
  • Pass standard: Adequate fiber adhesion visible.
  • Excellent: Strong adhesion, many fibers remain.
  • Poor: Clean separation, minimal fiber adhesion.

Summary Table for Adhesion Grading (Qualitative)

Diagram: Adhesion Test Process

flowchart TD
    A[Prepare Specimen] --> B[Submerge in Water at 20°C]
    B --> C[Heat Water to 60 ± 2°C for 3 hrs]
    C --> D[Plunge Specimen into Cold Water]
    D --> E[Apply Force to Separate Plies]
    E --> F{Examine Fractured Surface}
    F --> G[Assess Fiber Adhesion]
    G --> H[Grade Adhesion: Excellent / Pass / Poor]

This test ensures the durability and quality of glue bonds in blockboards as per IS 15877 requirements.