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IS 10013:2000 (Part 2) is the Indian Standard (BIS) for water-soluble type wood preservatives, part 2: copper-chrome-arsenic (cca) wood preservative. This standard specifies the requirements for three types of Copper-Chrome-Arsenic (CCA) water-soluble wood preservatives. It details the chemical composition, preparation of treating solutions, packing/marking guidelines, and includes test methods for determining the percentage of active components.
water-soluble type wood preservatives, Part 2: Copper-chrome-arsenic (CCA) wood preservative
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! CCB is a water-based preservative; timber must be adequately dried after treatment to prevent warping and ensure dimensional stability.
! Strict adherence to safety protocols, including use of appropriate Personal Protective Equipment (PPE), is essential when handling the preservative concentrate and treated wood due to the toxicity of chromium and copper.
! The effectiveness of treatment is determined by the penetration and net dry salt retention achieved, which should be specified and checked as per IS 401.
AWPA P5-23American Wood Protection Association (AWPA), USA
HighCurrent
Standard for Waterborne Preservatives
Directly specifies the chemical composition requirements for ACC preservative (listed in Section 3).
BS 3452:1962British Standards Institution (BSI), United Kingdom
HighWithdrawn
Specification for copper/chrome water-borne wood preservatives and their application
Historically equivalent standard specifying the formulation and use of copper/chrome preservatives.
AS 1604.1:2021Standards Australia (SA), Australia
MediumCurrent
Specification for preservative treatment - Part 1: Sawn and round timber
Specifies requirements for preservative-treated timber and lists ACC as a permitted preservative type, often referencing AWPA for formulation.
Key Differences
≠IS 10013 specifies the formulation by the mass of commercial ingredients (e.g., 50 parts Copper Sulphate Pentahydrate), whereas AWPA P5 specifies it by the mass percentage of the final active oxides (e.g., 31.8% CuO).
≠IS 10013 explicitly specifies a minimum treating solution concentration of 6% (m/m), while AWPA standards focus on the final retention of preservative in the wood (kg/m³), with the solution strength adjusted to meet that target.
≠The Indian Standard allows the use of acetic acid as an alternative to chromic acid for pH adjustment, a provision not found in the AWPA P5 formulation for ACC.
≠The required pH for the treating solution differs; IS 10013 specifies a range of 3.0 to 4.0, whereas the related AWPA U1 standard requires a tighter and more acidic range of 2.0 to 3.0 for ACC.
Key Similarities
≈Both standards define a preservative based on the same core active components: a water-soluble copper compound for fungicidal properties and a hexavalent chromium compound as a fixative and co-biocide.
≈The fundamental purpose is identical: to define a chemical composition for the industrial pressure treatment of wood, protecting it against fungal decay and insect attack.
≈Both preservatives rely on the principle of chromium-based fixation, where chemical reactions within the wood structure render the copper and chromium components highly insoluble and resistant to leaching.
≈The ratio of copper to chromium, when calculated on an active oxide basis (CuO to CrO₃), is nearly identical between the IS 10013 formulation and the AWPA P5 specification (approximately 1:2.1).
Parameter Comparison
Parameter
IS Value
International
Source
Formulation Basis
Mass of hydrated salt ingredients (e.g., CuSO₄·5H₂O)
Mass percentage of active oxides (CuO, CrO₃)
AWPA P5-23
Copper Content (as CuO % of total oxides)
Approx. 31.9% (calculated from ingredients)
31.8%
AWPA P5-23
Chromium Content (as CrO₃ % of total oxides)
Approx. 68.1% (calculated from ingredients)
68.2%
AWPA P5-23
Treating Solution pH
3.0 to 4.0
2.0 to 3.0
AWPA U1
Minimum Solution Strength
Not less than 6% (mass/mass)
Not specified; determined by target retention in wood
AWPA U1
Sludge / Insoluble Matter Limit
Shall produce no visible sludge
Shall not exceed 0.2% by weight
AWPA P5-23
Source of Copper
Copper Sulphate (conforming to IS 261)
Not specified by ingredient, only by final oxide composition and purity
AWPA P5-23
⚠ Verify details from original standards before use
Key Values8
Quick Reference Values
Minimum Copper Sulphate (as CuSO4.5H2O) content23.5% by mass
Maximum Copper Sulphate (as CuSO4.5H2O) content26.5% by mass
Minimum Sodium Dichromate (as Na2Cr2O7.2H2O) content38.0% by mass
Maximum Sodium Dichromate (as Na2Cr2O7.2H2O) content42.0% by mass
Minimum Boric Acid (as H3BO3) content13.5% by mass
Maximum Boric Acid (as H3BO3) content16.5% by mass
pH of 2.5% treating solution2.5 to 3.5
Maximum sludging in 5% solution0.5% by volume
Key Formulas
Mass of Copper, percent = (V x N x 6.35) / M — Appendix A, for copper determination
Mass of Hexavalent Chromium, percent = (V x N x 1.733) / M — Appendix B, for chromium determination
Mass of Arsenic, percent = (V x N x 3.746) / M — Appendix C, for arsenic determination
Tables & Referenced Sections
Key Tables
Table 1: Chemical Requirements of Copper-Chrome-Boron (CCB) Preservative
What are the active components of CCB wood preservative?+
The active components are Copper Sulphate, Sodium Dichromate, and Boric Acid, with their mass percentages specified in Table 1.
What is the required pH for a CCB treating solution?+
The pH of a 2.5 percent solution of the preservative in water should be between 2.5 and 3.5 (Clause 3.1).
Is CCB preservative suitable for timber in contact with the ground?+
Yes, when applied to achieve the required retention and penetration levels as specified in IS 401, CCB treated timber is suitable for ground contact and exterior applications.
In what form is CCB preservative supplied?+
It is supplied as a homogeneous powder or paste, which is then dissolved in water to form the treating solution (Clause 3.2).