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

IS 10013 Part 3 - Scope & Key Specifications for Copper-Chrome-Boron (CCB) Preservative

Scope:

• Specifies water-soluble wood preservatives based on copper, chromium, and boron compounds.
• Focuses on the composition and properties of CCB preservatives used for timber treatment.

Key Formulations (Clause 2.1 & 2.1.1):

Notes:

• The preservative must contain at least the minimum % of each active ingredient.
• These chemicals provide fungicidal, insecticidal, and anti-decay properties.
• The standard also references methods for estimating preservative content in timber and solutions.

Summary Diagram:

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 ensures timber is effectively protected using a standardized, water-soluble preservative mix per IS 10013 Part 3.

IS 10013 Part 3 — Composition and Properties of Copper-Chrome-Boron (CCB) Preservative

Key Specifications (Clause 2.1 & 2.1.1)

• The active ingredients must meet minimum percentages as above.
• The preservative is a water-soluble formulation designed for timber treatment.
• Analysis of ingredients follows IS 2753 (Part I) - 1964.

Notes:

• Sodium or potassium dichromate can be used interchangeably.
• The formulation ensures effective protection against fungal and insect attack.
• Rounding off of numerical values should follow the revised rules as per the code.

Summary Table for Quick Reference

This formulation ensures durability and preservative effectiveness for treated timber per IS 10013 Part 3 standards.

IS 10013 Part 3 - Sampling: Key Points & Specifications

• Sampling Procedure (Clause 3.1):
  Samples must be taken from a required number of drums from a single supply batch, following the random sampling method in IS 4905-1968.

• Sample Size (Clause 3.3):
  For dry powder preservatives, a representative sample of at least 10% of the total contents of the container should be taken for analysis.

• Container Marking (Clause 5.1):
  Each container must be clearly marked with:

  • Manufacturer’s name or trademark
  • Date of manufacture
  • Percentage of dry active ingredients

Sampling Summary Table

Reference for Sampling Method (IS 4905-1968)

• Random sampling ensures unbiased, representative samples.
• Typically involves selecting drums at random intervals or using random number tables.

flowchart TD
    A[Start: Supply Batch] --> B[Select Random Drums (IS 4905-1968)]
    B --> C[Take Sample from Each Selected Drum]
    C --> D{Dry Powder Form?}
    D -- Yes --> E[Sample ≥ 10% Contents]
    D -- No --> F[Follow Other Sampling Rules]
    E & F --> G[Mark Container as per Clause 5.1]
    G --> H[Send for Analysis]

This ensures representative and standardized sampling for accurate preservative analysis.

IS 10013 Part 3: Chemical Analysis - Key Points

• Chemical Purity:
  Each chemical must have ≥ 95% purity (Clause 2.4).

• Chemical Composition (Clause 2.1.1):
  Minimum percentages of ingredients in preservative solution:

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

• Chemical Analysis Method:
  Follow IS 2753 (Part 1) - 1964, Clause 3.4 for solution analysis procedures.

Summary Table for Chemical Composition:

Notes:

• Ensure sampling and testing follow IS 10013 Part 3 procedures.
• Purity and proportions are critical for effective timber preservation.

flowchart TD
    A[Start: Prepare Solution] --> B[Check Chemical Purity ≥ 95%]
    B --> C[Measure Ingredients as per %]
    C --> D{Use Copper Sulphate or Dichromate?}
    D -->|Copper Sulphate| E[Add 32.5% CuSO₄·5H₂O]
    D -->|Sodium Dichromate| F[Add 44.5% Na₂Cr₂O₇·2H₂O]
    D -->|Potassium Dichromate| G[Add 44.5% K₂Cr₂O₇

IS 10013 Part 3 - Marking and Labeling Key Points

Mandatory Markings on Containers (Clause 5.1)

• Manufacturer's name or trade-mark
• Date of manufacture
• Percentage of dry active ingredients
• Moisture content (Clause 2.3.1)
• Descriptive literature of the product must also mention these.

Optional Marking (Clause 5.1.1)

• ISI Certification Mark can be used as per ISI rules, indicating compliance and quality assurance.

Composition Requirements (Clause 2.1.1)

Notes

• Percentage values must be not less than the above minimums.
• Numerical values should be rounded off as per IS rules.
• Labeling ensures traceability and quality control.

Summary Diagram: Marking on Preservative Containers

flowchart TD
    A[Container] --> B[Manufacturer's Name/Trade Mark]
    A --> C[Date of Manufacture]
    A --> D[Percentage of Dry Active Ingredients]
    A --> E[Moisture Content]
    A --> F[Descriptive Literature]
    A --> G[Optional: ISI Certification Mark]

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

IS 10013 (Part 3) - Key References and Specifications

1. Preservative Composition (Clause 2.1 & 2.1.1)

• The copper-chrome-boron preservative is formulated with these active ingredients in nominal proportions.

2. ISI Certification Mark (Clause 5.1.1)

• Containers may be marked with the ISI mark, ensuring compliance with Indian Standards.
• ISI mark guarantees quality control, inspection, and continuous conformity checks.

3. Related Indian Standards on Timber Preservation

Summary Diagram: Preservative Composition

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