water-soluble type wood preservatives, Part 3: Copper-chrome-boron (CCB) wood preservative
1981 Edition

Overview of IS 10013 Part 3 - Scope and Core Requirements for Copper-Chrome-Boron (CCB) Wood Preservative

Scope:

• Defines the water-soluble wood preservatives incorporating copper, chromium, and boron compounds.
• Details the chemical composition and essential properties for CCB preservatives applied in timber treatment.

Key Chemical Composition (Clauses 2.1 & 2.1.1):

Important Notes:

• Each active ingredient must meet or exceed the minimum percentage specified.
• These chemicals confer fungicidal, insecticidal, and anti-decay properties.
• The standard also refers to methods for quantifying preservative content in timber and solutions.

Diagrammatic Representation:

flowchart LR
    A[CCB Preservative] --> B[Boric Acid (H3BO3)]
    A --> C[Copper Sulphate (CuSO4·5H2O)]
    A --> D[Chromium Compounds]
    D --> D1[Sodium Dichromate (Na2Cr2O7·2H2O)]
    D --> D2[Potassium Dichromate (K2Cr2O7)]

This guarantees timber is protected effectively with a standardized, water-soluble preservative formulation according to IS 10013 Part 3.

IS 10013 Part 3 — Detailed Composition and Properties of Copper-Chrome-Boron Preservative

Essential Specifications (Clauses 2.1 & 2.1.1)

• Active constituents must adhere to the minimum specified levels.
• The preservative formulation is fully water-soluble and intended for wood protection.
• Analytical procedures align with IS 2753 (Part I) - 1964.

Notes:

• Sodium or potassium dichromate may be used interchangeably.
• The formulation is designed to provide effective protection against fungal and insect attacks.
• Numerical values should be rounded following the updated guidelines of the standard.

Quick Reference Table

This composition assures durability and preservative efficacy for wood treated as per IS 10013 Part 3.

Sampling Guidelines Under IS 10013 Part 3 - Key Aspects and Requirements

• Sampling Methodology (Clause 3.1): Samples should be drawn from the prescribed number of containers within a single batch, employing random sampling in accordance with IS 4905-1968.

• Sample Quantity (Clause 3.3): For dry powdered preservatives, the sample for testing should represent at least 10% of the container’s total content.

• Container Identification (Clause 5.1): Each container must be clearly labeled with:

  • Manufacturer’s name or trademark
  • Manufacturing date
  • Percentage of dry active ingredients present

Sampling Summary Table

Reference for Sampling (IS 4905-1968)

• Random sampling ensures unbiased and representative collection.
• Typically involves selecting containers at random intervals or via randomized number tables.

flowchart TD
    A[Batch Start] --> B[Random Drum Selection (IS 4905-1968)]
    B --> C[Sample Collection from Selected Drums]
    C --> D{Dry Powder Product?}
    D -- Yes --> E[Sample ≥ 10% Content]
    D -- No --> F[Apply Alternative Sampling Protocol]
    E & F --> G[Label Containers per Clause 5.1]
    G --> H[Dispatch for Laboratory Analysis]

This ensures that sampling is representative and standardized for accurate preservative evaluation.

Key Chemical Analysis Requirements in IS 10013 Part 3

• Purity Standards: All constituent chemicals must possess a minimum purity level of 95% (Clause 2.4).

• Chemical Composition Requirements (Clause 2.1.1): The minimum weight percentages for active components in the preservative solution are as follows:

  Chemical	Formula	Minimum % by Weight
  Boric acid	H3BO3	15.5
  Copper sulphate	CuSO4·5H2O	32.5
  Sodium dichromate	Na2Cr2O7·2H2O	44.5
  Potassium dichromate	K2Cr2O7	44.5

• Analysis Methodology: Testing should comply with IS 2753 (Part I) - 1964, specifically Clause 3.4 pertaining to solution analysis.

Chemical Composition Summary Table:

Notes:

• Sampling and testing must be conducted per IS 10013 Part 3 protocols.
• Strict adherence to purity and composition is critical for ensuring preservative effectiveness.

flowchart TD
    A[Prepare Preservative Solution] --> B[Verify Chemicals ≥ 95% Purity]
    B --> C[Measure Ingredients According to Percentages]
    C --> D{Choose Dichromate Type}
    D -->|Sodium| E[Add 44.5% Na2Cr2O7·2H2O]
    D -->|Potassium| F[Add 44.5% K2Cr2O7]
    D -->|Copper Sulphate| G[Add 32.5% CuSO4·5H2O]

This process ensures a high-quality preservative mix.

Essential Marking and Labeling Specifications Under IS 10013 Part 3

Required Container Markings (Clause 5.1):

• Manufacturer’s name or trademark
• Manufacture date
• Percentage of dry active ingredients
• Moisture content as specified (Clause 2.3.1)
• Product descriptive literature must also include these details.

Optional Marking (Clause 5.1.1):

• The ISI Certification Mark may be applied in compliance with ISI guidelines, indicating conformity and quality assurance.

Composition Requirements Recap (Clause 2.1.1):

Additional Notes:

• Active ingredient percentages must not fall below the specified minima.
• Values should be rounded according to IS rounding rules.
• Proper labeling supports traceability and quality management.

Visual Summary: Container Marking Breakdown

flowchart TD
    A[Preservative Container] --> B[Manufacturer Name / Trademark]
    A --> C[Manufacture Date]
    A --> D[Dry Active Ingredient Percentage]
    A --> E[Moisture Content]
    A --> F[Product Description Literature]
    A --> G[Optional ISI Certification Mark]

This guarantees clear identification, compliance, and quality assurance for timber preservatives.

IS 10013 Part 3 – Crucial References and Related Standards

1. Composition of Preservative (Clauses 2.1 & 2.1.1)

• The CCB preservative is formulated with these active ingredients in approximate ratios.

2. ISI Certification Mark (Clause 5.1.1)

• Containers may be labeled with the ISI mark, affirming conformity to Indian Standards.
• The ISI mark represents quality control, inspection, and ongoing compliance verification.

3. Other Indian Standards Associated with Timber Preservation

Diagram: Preservative Composition Overview

graph LR
A[Boric Acid (15.5-18%)] --> C[CCB Preservative Mix]
B[Copper Sulphate (32.5-35%)] --> C
D[Sodium Dichromate (44.5-47%)] --> C
E[Potassium Dichromate (44.5-47%)] --> C

This suite of standards ensures a comprehensive framework for effective timber preservation aligned with Indian forestry and construction industry requirements.