water-soluble type wood preservatives, Part 2: Copper-chrome-arsenic (CCA) wood preservative
1981 Edition

Overview of Scope & Principal Specifications for Copper-Chrome-Arsenic Wood Preservatives

Scope:

• Details specifications for water-soluble Copper-Chrome-Arsenic (CCA) preservatives intended for timber treatment.
• Designed to enhance durability of timbers with lesser natural resistance through chemical treatment.
• Supports prolonged service life of timber in construction and industrial sectors.

Formulation Details (Clauses 2.1 & 2.1.1)

Purity Criteria (Clause 2.4)

• Each chemical must have a purity level of at least 95%.
• Arsenic pentoxide solution strength must be no less than 72%.
• The dry formulation should contain a minimum of 95% total active ingredients.

Visual Breakdown of CCA Composition

pie
    title Composition Distribution of CCA Preservative (Nominal %)
    "Copper Sulphate (37.5%)": 37.5
    "Dichromate Compound (50%)": 50
    "Arsenic Pentoxide (12.5%)": 12.5

Note: This standard promotes sustainable timber utilization by defining chemical composition and purity essential for effective preservation. For treatment techniques, refer to IS 401-1982.

Composition and Properties of Copper-Chrome-Arsenic (CCA) Preservatives as per IS 10013 Part 2

1. Nominal Composition by Weight (Clause 2.1)

2. Minimum Ingredient Percentages (Clause 2.1.1)

3. Additional Information

• Quality control and sampling follow IS 2753 (Part I)-1964.
• Analytical procedures for copper, arsenic, chromium, and other elements are prescribed.
• Numerical values are rounded according to the latest standard guidelines.

This balanced formulation optimizes wood preservation by leveraging the toxic and fixation properties of copper, chromium, and arsenic.

Key Aspects of Sampling and Chemical Analysis in IS 10013 Part 2

1. Sampling Approach

• Samples should be drawn randomly from several containers within a single supply batch.
• Random sampling must adhere to IS 4905:1968 standards.
• This ensures that the sample accurately represents the preservative solution.

2. Chemical Testing

• Testing is conducted according to Clause 3.4 of IS 2753 (Part 1) - 1964.
• Analysis includes copper, arsenic, chromium, zinc, boron, creosote, and fuel oil content.

3. Composition Requirements

• Minimum ingredient percentages are maintained as specified in Clause 2.1.1.

4. Rounding Guidelines

• Numerical data must be rounded according to the standard's specified rules.

Sampling and Analysis Workflow

flowchart TD
    A[Begin with Supply Batch] --> B[Perform Random Sampling (IS 4905)]
    B --> C[Conduct Chemical Analysis (IS 2753 Part 1)]
    C --> D{Evaluate Composition}
    D -->|Conforms| E[Approve Batch]
    D -->|Non-conforms| F[Reject or Reprocess Batch]

This standard ensures the quality assurance of timber preservative solutions through proper sampling and precise chemical testing.

Summary of Chemical Analysis Procedures as per IS 10013 Part 2 (1981)

Essential Specifications:

• Chemical Purity: All constituent chemicals must have a purity of at least 95% (Clause 2.4). Arsenic pentoxide in solution form must have a minimum strength of 72%.

• Composition of Preservative (Clause 2.1.1):

• Total Active Ingredients: Minimum 95% in dry mixture (Clause 2.4).

Chemical Testing Process:

• Follow IS 2753 (Part I) - 1964, Clause 3.4 for analyzing the preservative solution.
• Sampling should be randomized as per Clause 1.2.
• Testing includes copper, arsenic, chromium, zinc, boron, creosote, and fuel oil quantification.

Rounding Instructions:

• Apply the updated rounding methodology specified by the code for numeric values.

flowchart TD
    A[Sample Collection] --> B[Chemical Testing per IS 2753 (3.4)]
    B --> C{Verify Purity}
    C -->|≥95%| D[Calculate Percentages]
    C -->|<95%| E[Reject or Reprocess]
    D --> F{Confirm Composition}
    F -->|Meets Requirements| G[Accept Solution]
    F -->|Fails| E

This ensures adherence to IS 10013 Part 2 chemical standards for timber preservatives.

Key Requirements for Marking Containers as per IS 10013 Part 2

Clause 5.1 - Container Labeling:

Each preservative container must clearly indicate:

• Producer’s name or trademark
• Manufacturing date
• Dry active ingredient concentration (%)

Clause 5.1.1:

• Containers may display the Standard Mark following BIS guidelines.

Clause 5.1.2:

• Usage of the Standard Mark is regulated under the Bureau of Indian Standards Act, 1986.
• Licensing requirements for the Standard Mark must be obtained from BIS.

Marking Information Summary

Additional Notes:

• Marking assures traceability and quality verification.
• Use of the Standard Mark requires appropriate licensing.
• Labels must be legible and durable on packaging.

flowchart LR
    A[Container] --> B[Marking]
    B --> C[Manufacturer Name/Trademark]
    B --> D[Date of Manufacture]
    B --> E[Dry Active Ingredient Percentage]
    B --> F[Optional Standard Mark (licensed by BIS)]

For comprehensive licensing and marking instructions, contact the BIS regional centers as per the standard.

Quality Criteria for Copper-Chrome-Arsenic (CCA) Preservatives under IS 10013 Part 2

Main Specifications & Component Ratios (Clauses 2.1 & 2.1.1)

Purity Standards (Clause 2.4)

• Each chemical must have a minimum purity of 95%.
• Arsenic pentoxide solution must have a strength of at least 72%.
• Adjust formulations to guarantee at least 95% total active ingredients in the dry blend.

Quality Control Overview

Notes:

• Adherence to these compositions ensures effective wood protection.
• Formulations may be modified to meet minimum active ingredient levels.
• Proper marking and certification as per Clause 5.1.2 are mandatory.

flowchart LR
    A[Raw Material Chemicals] --> B[Verify Purity ≥ 95%]
    B --> C[Mix Ingredients According to Percentages]
    C --> D[Adjust to Ensure Total Active Ingredient ≥ 95%]
    D --> E[Final Preservative Product]
    E --> F[Marking and Certification]

This guarantees conformity with IS 10013 (Part 2) quality standards for wood preservatives.

Packaging and Storage Guidelines According to IS 10013 Part 2

Preservative Composition Ranges (Clauses 2.1 & 2.1.1)

• Preservative forms: Available as dry solids, semi-liquid pastes, or aqueous solutions (Clause 2.2).
• Percentage values should be rounded following IS rounding rules.
• Analytical testing references IS 2753 (Part I).

Packaging and Storage Best Practices

• Store in containers that are airtight and resistant to corrosion.
• Keep preservatives in cool, dry, and well-ventilated environments away from direct sunlight.
• Prevent contamination by storing separately from incompatible substances.
• Containers should be clearly labeled with composition details and hazard warnings.

flowchart LR
    A[Prepare Preservative] --> B{Form Type}
    B --> C[Dry Solid]
    B --> D[Semi-liquid Paste]
    B --> E[Solution]
    E --> F[Packaging in Sealed Containers]
    F --> G[Storage in Suitable Conditions]

These measures ensure chemical stability and safe handling during storage and transport.