Preservation of bamboo for structural purposes - Code of practice

IS 9096 - Scope & Key Specifications Summary

Scope (Clause 1.2):

• Covers treatment of bamboo for structural purposes.
• Does not cover bamboo treatment for non-structural use (covered by IS 1902).

Recommended Preservatives (Clause 3 & Table 1)

Treatment Methods & Concentrations (Table 1 Extract)

Additional Notes:

• Sample preparation for chemical analysis: chips ~10×2×1 mm or powder, 10-20 g sample (Clause 6.2).
• Testing of preservatives in treated bamboo per IS 1902.
• Rounding off values per IS 2:1960.

flowchart TD
    A[Bamboo Structural Use] --> B{Bamboo Type}
    B -->|Dry| C[Preservative Selection]
    B -->|Green| D[Preservative Selection]
    C --> E[Treatment Method]
    D --> E
   

IS 9096: Referenced Standards & Key Specifications Summary

Referenced IS Standards:

Recommended Preservatives (Clause 3 & Table 1)

• Coal Tar Creosote (IS 218):
  • Used as 50:50 creosote-fuel oil mixture for stability.
• Copper-Chrome-Arsenic (CCA) (IS 10013 Part 2):
  • Typical mix: CuSO4 : As2O3 : Na2Cr2O7 = 3:1:4 by weight.

Treatment Methods & Preservative Absorption (From Table 1)

IS 9096: Recommended Preservatives for Bamboo Treatment

Key Preservatives & Compositions:

Treatment Guidelines (per Clause 5.2 and Table 1 summary):

• Choice of preservative depends on bamboo use (structural or non-structural).
• Concentration and absorption vary per preservative and treatment method.
• Refer Table 1 in IS 9096 for detailed absorption rates and treatment methods (e.g., pressure or dipping).

Important Notes:

• IS 9096 excludes non-structural bamboo treatment (covered by IS 1902).
• Use preservatives conforming to referenced IS standards for quality assurance.
• Treatment methods include pressure treatment, brushing, or soaking depending on preservative and end-use.

flowchart TD
    A[Bamboo] --> B{Use Type}
    B -->|Structural| C[Preservative Selection]
    B -->|Non-Structural| D[Refer IS 1902]
    C --> E[ACC (IS 10013 Part 1)]
    C --> F[CCA (IS 10013 Part 2)]
    C --> G[Coal Tar Creosote (IS 218)]
    E & F & G --> H[Treatment Method & Absorption (Table 1)]

Summary: Use ACC, C

IS 9096: Methods of Treatment for Bamboo Preservation

1. Recommended Preservatives (Clause 3)

• Coal Tar Creosote: 50:50 creosote:fuel oil mixture (IS 218)
• Copper-Chrome-Arsenic (CCA): CuSO4 : As2O3 : Na2Cr2O7 = 3:1:4 (IS 10013 Part 2)
• Copper-Chrome-Boron (CCB): H3BO3 : CuSO4 : Na2Cr2O7 = 1.5:3:4 (IS 10013 Part 3)
• Boric Acid-Borax: Ratio 1:1.5 (effective against lyctus borers)
• Copper-Zinc-Naphthenate/Abietates

2. Methods of Treatment (Clause 4)

• Surface Application: Brushing, dipping
• Vacuum/Pressure Process: For deep penetration
• Hot and Cold Process
• Fast Fluctuating Pressure (FFP) Process
• Boucherie Process: Traditional bamboo treatment
• Additional: Diffusion, Modified Boucherie, Steeping/Butt end treatment (from IS 1902 for non-structural bamboo)

3. Choice of Preservative & Method (Clause 5.1)

• Depends on intended use (structural vs non-structural)
• Refer to IS 401 for detailed treatment procedures

Summary Table: Preservative Composition

flowchart LR
    A[

IS 9096: Choice of Preservative & Method of Treatment for Bamboo

1. Recommended Preservatives (Clause 3)

• Coal Tar Creosote:
  • Mixture: 50:50 creosote and fuel oil
  • Conforms to IS 218
• Copper-Chrome-Arsenic (CCA):
  • Composition ratio: CuSO4 : As2O3 : Na2Cr2O7 = 3 : 1 : 4
  • Per IS 10013 (Part 2)
• Copper-Chrome-Boron (CCB):
  • Composition ratio: H3BO3 : CuSO4 : Na2Cr2O7 = 1.5 : 3 : 4
  • Per IS 10013 (Part 3)
• Boric Acid-Borax:
  • Ratio 1:1.5, effective against lyctus borers
• Copper-Zinc Naphthenate/Abietates:
  • Copper and zinc salts of naphthenic/abietic acid

2. Methods of Treatment (Clause 4)

• Surface application (brushing, dipping)
• Vacuum/pressure process
• Hot and cold process
• Fast Fluctuating Pressure (FFP) process
• Boucherie process
• Diffusion, Modified Boucherie, Steeping (per IS 1902 for non-structural bamboo)

3. Preservative Selection & Treatment (Clause 5.2, Table 1 Summary)

Summary Diagram of Treatment Process

flowchart TD
    A[Select Use of Bamboo] --> B{Structural or Non-Structural?}
    B

IS 9096: Sampling for Testing of Preservative in Bamboo

Key Specifications & Formulas:

• Sample Weight (Clause 6.1):
  For chemical analysis, cut representative samples from treated bamboo weighing:
  [ \text{Sample weight} = 100,g \text{ per } 100,kg \text{ of bamboo} ]

• Sample Preparation (Clause 6.2):

  • Powder the sample by hand file or powdering machine, or convert into chips of approx:
    10 mm long × 2 mm wide × 1 mm thick
  • Mix thoroughly and take 10 to 20 g of powder/chips for chemical analysis.

• Rounding Off (General):
  Final test values must be rounded as per IS 2:1960, retaining the same number of significant digits as specified.

Reference Table: Recommended Preservatives & Treatment (Extract)

(Refer to full Table 1 in IS 9096 for detailed preservative types and methods.)

flowchart TD
    A[Treated Bamboo] --> B[Sample Cutting (100g/100kg)]
    B --> C[Powdering or Chipping]
    C --> D[Mix Powder/Chips]
    D --> E[Take 10-20g for Chemical Analysis]
    E --> F[Testing as per IS1902]

Summary:

• Sample weight: 100g per 100kg bamboo
• Powder/chips size: 10×2×1 mm
• Analysis sample: 10-20g mixed powder/chips
• Follow IS 2:1960 for

IS 9096: Testing of Preservative in Treated Bamboo - Key Points

1. Sampling for Chemical Analysis (Clause 6.1)

• Cut representative samples from treated bamboo.
• Sample weight: ~100 g per 100 kg of treated bamboo.

2. Recommended Preservatives (Clause 3)

• Coal Tar Creosote:
  • Mixture: 50:50 creosote and fuel oil.
  • Conforms to IS 218.
• Copper-Chrome-Arsenic (CCA):
  • Composition ratio: CuSO4·5H2O : As2O3·2H2O : Na2Cr2O7·2H2O = 3 : 1 : 4.
  • Conforms to IS 10013 (Part 2).

3. Testing Procedure

• Chemical analysis on samples to verify preservative content.
• Ensure preservative absorption meets values in Table 1 (Clause 5.2) (not provided here).

Summary Table: Preservatives & Standards

flowchart TD
    A[Treated Bamboo] --> B[Sampling (100g/100kg)]
    B --> C[Chemical Analysis]
    C --> D{Preservative Content}
    D -->|Meets Spec| E[Pass]
    D -->|Below Spec| F[Fail - Re-treat]

For detailed absorption values and treatment methods, refer to Table 1 in Clause 5.2 of IS 9096 and IS 401.

IS 9096: Recommended Preservatives, Concentrations, Absorption & Treatment Methods for Bamboo

Treatment Methods (see IS 401 & IS 1902)

• Surface application: Brushing, dipping.
• Vacuum/Pressure process: Ensures deep penetration.
• Hot and Cold process: Thermal cycles enhance absorption.
• Fast Fluctuating Pressure (FFP): Rapid pressure changes for better penetration.
• Boucherie process: Bamboo immersed in preservative under pressure.
• Diffusion & Steeping: For non-structural bamboo (IS 1902).

Key Points:

• Absorption depends on preservative & method.
• Choice depends on structural use & exposure.
• Refer IS 401 for detailed procedures and IS 9096 Table 1 for exact absorption values.

flowchart LR
    A[Select Bamboo Use] --> B{Structural or Non-Structural?}
    B -->|Structural| C[Choose Preservative & Method from IS 9096 & IS 401]
    B -->|Non-Structural| D[Refer IS 1902 Treatment Methods]
    C --> E[Apply Treatment: Vacuum/Pressure, F