Classification of Indian canes and their zonal distribution

IS 15458: Scope Overview

• Scope: IS 15458 primarily deals with specifications related to timber technology and utilization, referencing IS 707:1976 for definitions.
• Applicable Standards: The standard integrates provisions from IS 707 (Glossary of Timber Terms), ensuring consistent terminology and understanding.
• General Requirements: Clause 3 outlines broad conditions for timber use, quality, and treatment but specifics depend on referenced standards.

Key Points:

• Definitions: Follow IS 707 for timber-related terms.
• Referenced Standards: Always check the latest edition of IS 707 for updated definitions.
• Scope Focus: Timber technology, utilization, and related quality controls.

Note:

IS 15458 does not provide direct formulas or tables in the scope section; it sets the framework referencing IS 707 for terminology and foundational requirements.

flowchart TD
    A[IS 15458 Scope] --> B[References IS 707:1976]
    B --> C[Definitions of Timber Terms]
    A --> D[General Requirements (Clause 3)]
    D --> E[Timber Quality]
    D --> F[Timber Utilization]

For detailed formulas or tables, refer to specific clauses or IS 707.

IS 15458 - References Summary

This standard references IS 707:1976 for timber terminology and defines classification of Indian rattans by properties and end uses (Clause 7.4, Table 1).

Key Specifications from Table 1 (Clause 7.4):

Notes:

• Strength Class I indicates higher strength rattans (e.g., C.gamblei with specific gravity ~0.599).
• Diameter Class: Large or Small, important for end-use suitability.
• Distribution codes (a, b, c) indicate source regions.

Reference:

• Use IS 707:1976 for timber terms.
• Check latest editions for updates.

flowchart TD
    A[IS 15458 Standard] --> B[References IS 707:1976]
    A --> C[Classification of Rattans]
    C --> D[Furniture Frames (Large Diameter)]
    C --> E[Chair Seats/Backs (Small Diameter)]
    C --> F[Walking Sticks & Sports Goods]
    C --> G[Handicraft Items]
    D --> H[Specific Gravity: 0.400 - 0.599]
    E --> I[Specific Gravity: 0.397 - 0.581]
    F --> J[Strength Class I & II]
    G --> K[Strength Class I & II]

For design or procurement, refer to specific species properties in Table 1 for strength and density values.

IS 15458 - General Requirements (Clause 3 & 7.2)

Key Specifications:

• Reference Standards: Definitions per IS 707 apply.
• Strength Classification of Unsplitted Rattan (Clause 7.2):

Notes:

• MOR and UTS are mechanical test values used to classify rattan strength.
• Use the latest edition of referenced standards for compliance.
• These classes guide material selection for structural applications.

flowchart TD
    A[Mechanical Testing] --> B{MOR or UTS Value}
    B -->|> 70 N/mm²| C[Class I: Strong to Very Strong]
    B -->|45-70 N/mm²| D[Class II: Moderately Strong]
    B -->|< 45 N/mm²| E[Class III: Weak]

This classification ensures appropriate use of rattan based on mechanical properties for structural safety.

IS 15458 - Definitions & Classification Summary

• IS 15458 refers to definitions in IS 707: 1976 (Glossary of timber technology terms).
• Key classification of Indian rattans is given in Table 1 (Clause 7.4), categorizing species by:
  • Botanical Name
  • Vernacular/Trade Name
  • Distribution (Source)
  • Diameter Class (Large/Small)
  • Average Basic Specific Gravity (Density)
  • Strength Class (I, II, or unspecified)

Important Table Extract (Example):

Notes:

• Specific gravity is crucial for strength and usage suitability.
• Strength classes guide end-use (furniture, walking sticks, handicrafts).
• Distribution codes (a, b, c) refer to geographic source areas.

Reference:

• Use IS 707: 1976 for timber terminology.
• For design/specification, consult latest editions of referenced standards.

flowchart TD
    A[IS 15458 Definitions] --> B[IS 707 Timber Glossary]
    A --> C[Classification of Rattans]
    C --> D[Botanical Name]
    C --> E[Trade Name]
    C --> F[Distribution]
    C --> G[Diameter Class]
    C --> H[Specific Gravity]
    C --> I[Strength Class]

IS 15458: Zonal Distribution & Classification of Indian Rattans

The standard divides Indian rattans into 3 zones based on natural occurrence:

• Zone a: North, East & North-Eastern states
• Zone b: Western Ghats (Southern India)
• Zone c: Andaman & Nicobar Islands

Key Specifications (Table 1 Summary)

Notes:

• Diameter Classes: Small or Large, important for end-use suitability.
• Specific Gravity: Based on green volume to oven-dry weight; higher values indicate denser, stronger cane.
• Strength Classes: I (highest), II, or unclassified.

Application:

• Use Zone and Diameter Class to select rattans suited for specific products (furniture, seats, walking sticks).
• Refer to Specific Gravity and Strength Class for mechanical property expectations.

graph TD
A[Indian Rattans] --> B[Zone a: N, E, NE States]
A --> C[Zone b: Western Ghats]
A --> D[Zone c: Andaman & Nicobar]
B --> E[Small/Large Diameter]
C --> F[Small/Large Diameter]
D --> G[Small/Large Diameter]
E --> H[Specific Gravity & Strength Class]
F --> H
G --> H

This classification aids in selecting rattans based on geographic source, size, and mechanical properties per IS 15458.

IS 15458: Physical and Mechanical Properties of Rattan

1. Strength Classification (Clause 7.2)

2. Key Physical Properties (Clause 7.4, Table 1)

• Diameter Class: Large or Small (species-specific)
• Average Basic Specific Gravity (SG): Ranges approx. 0.40 to 0.60 for various species
• Distribution: Denoted by codes (a, b, c) indicating source regions
• Strength Class: Assigned per species based on MOR/UTS

3. Example Species Properties (Furniture Frames)

Notes:

• Specific Gravity (SG) is key for density-related calculations.
• Use MOR or UTS values for design strength parameters.
• Refer to IS 707 for timber terminology.

flowchart LR
    A[Mechanical Testing] --> B{Strength Class}
    B -->|MOR or UTS > 70| C[Class I: Strong]
    B -->|45 ≤ MOR or UTS ≤ 70| D[Class II: Moderate]
    B -->|MOR or UTS < 45| E[Class III: Weak]

This classification guides material selection for furniture, handicrafts, and structural applications.

IS 15458: Method of Classification for Indian Rattans

Strength Classes (Clause 7.2)

Classification Table (Clause 7.4) — Key Parameters

Usage Categories

• Furniture Frames: Large diameter, strength classes mostly I or II.
• Chair Seats/Backs: Small diameter, strength classes mostly II.
• Walking Sticks, Sports Goods: Both large and small diameter, strength classes I or II.
• Handicrafts/Novelty Items: Mostly small diameter, variable strength.

Summary

• Classification is based on mechanical test values (MOR/UTS).
• Species are grouped by end-use, diameter, specific gravity, and strength class.
• Use Table 1 (Clause 7.4) for species selection per application.

flowchart TD
    A[Mechanical Testing] --> B{MOR or UTS}
    B -->|>70 N/mm²| C[Class I: Strong]
    B -->|45-70 N/mm²| D[Class II: Moderate]
    B -->|<45 N/mm²| E[Class III: Weak]
    C --> F[Suitable for Furniture Frames]
    D --> G[Suitable for Chair Seats, Walking Sticks]
    E --> H[Limited Structural Use]

This classification ensures material suitability for intended structural and non-structural applications.

IS 15458: Diameter Class & Related Specifications

Diameter Class (Clause 7.1)

• Large Diameter Rattan: Unsplit cane with diameter ≥ 18 mm (up to 40 mm or more).
• Small Diameter Rattan: Unsplit cane with diameter < 18 mm.

Strength Class (Clause 7.2)

MOR = Modulus of Rupture, UTS = Ultimate Tensile Stress

Classification Table (Clause 7.4) - Summary

Notes:

• Diameter class is based on the small end diameter.
• Specific gravity is measured on green volume to oven dry weight basis.
• Selection depends on end-use, diameter, and strength class.

flowchart LR
    A[Diameter at small end] -->|<18 mm| B[Small Diameter Rattan]
    A -->|≥18 mm| C[Large Diameter Rattan]

    B --> D{Strength Class}
    C --> D

    D -->|>70 N/mm²| E[Class I: Strong]
    D -->|45-70 N/mm²| F[Class II: Moderate]
    D -->|<45 N/mm²| G[Class III: Weak]

    E & F & G --> H[End Use Selection]

This classification aids in selecting appropriate rattan

IS 15458: Strength Class of Rattan

1. Strength Class Definitions (Clause 7.2)

2. Key Parameters for Classification (Clause 7.4, Table 1)

• Botanical Name & Trade Name
• Distribution (Source)
• Diameter Class: Large or Small
• Average Basic Specific Gravity (Green volume to oven dry weight)
• Strength Class (I, II, III)

3. Example Extract from Table 1 (Furniture Frames)

Summary

• Strength class is primarily based on MOR or UTS values.
• Specific gravity correlates with strength but is not the sole factor.
• Rattan species are classified for end-use based on these parameters.

flowchart TD
    A[Mechanical Testing] --> B{MOR or UTS Value}
    B -->|>70 N/mm²| C[Class I: Strong to Very Strong]
    B -->|45-70 N/mm²| D[Class II: Moderately Strong]
    B -->|<45 N/mm²| E[Class III: Weak]
    C --> F[Suitable for Heavy Duty Furniture]
    D --> G[Moderate Load Applications]
    E --> H[Light Duty or Decorative

IS 15458 - End-Use Class Summary (Clause 7.3 & related)

End-Use Classes:

• a) Furniture frames
• b) Furniture seat/backs
• c) Walking sticks, umbrella handles, sports goods, etc.
• d) Handicrafts/novelty items

Strength Classes (Clause 7.2)

• MOR = Modulus of Rupture (Static Bending Strength)
• UTS = Ultimate Tensile Strength

Key Specifications (Table 1, Clause 7.4)

• Botanical species are classified by:
  • Botanical Name
  • Trade Name
  • Distribution Zone
  • Diameter Class (Small/Large)
  • Average Basic Specific Gravity (Green volume to oven dry weight)
  • Strength Class (I, II, III)

Example Extract (Furniture Frames)

Usage Notes

• Select rattans with Class I or II strength for structural furniture.
• Smaller diameter rattans are preferred for seat/backs and handicrafts.
• Specific gravity correlates with strength and durability.

flowchart TD
    A[End-Use Class] --> B[Furniture Frames]
    A --> C[Furniture Seat/Backs]
    A --> D[Walking Sticks, Handles, Sports Goods]
    A --> E[Handicrafts/Novelty Items]

    B --> F[Large Diameter, Strength Class I/

IS 15458 - Classification Table of Indian Rattans (Clause 7.4)

This classification categorizes Indian rattans by species, end-use, distribution, diameter, specific gravity, and strength class.

Key Categories & Parameters:

Sample Extract from Table 1:

Notes:

• Specific Gravity correlates with strength and stiffness.
• Strength Class I species are preferred for high-stress applications like furniture frames.
• Distribution codes:
  • a = North/East/NE India
  • b = Western Ghats
  • c = Andaman & Nicobar Islands

Summary Diagram (Mermaid.js):

graph TD
  A[Indian Rattans] --> B[Furniture Frames]
  A --> C[Chair Seats/Back

IS 15458 Key Specifications for Rattan Derivatives & Processed Forms

1. Rattan Derivatives (Clause 4.12)

• Products obtained by splitting/peeling of cane.
• Used in furniture, handicrafts, sports goods, walking sticks, etc.

2. Classification & Properties (Clause 7.4, Table 1)

3. Distribution Zones (Clause 4.20)

• a) North, East, North-East India
• b) Western Ghats (South India)
• c) Andaman & Nicobar Islands

4. Important Genera

• Calamus, Daemonorops, Korthalsia, Plectocomia, etc.

Summary Table (Excerpt)

IS 15458: Quality Assessment and Defects in Cane

Key Definition:

• Defect (Clause 4.3): Any abnormality in cane that reduces strength, appearance, or commercial value.

Quality Assessment:

• Visual inspection for defects such as:
  • Cracks, splits, knots
  • Insect damage
  • Decay or rot
  • Warping or bending
• Defects are classified by their severity and location, affecting usability.

Specifications & References:

• Use IS 707:1976 for timber-related defect terminology and criteria.
• Defect impact is quantified by reduction in mechanical properties (strength, stiffness).

Typical Defect Impact Formula (Generalized):

[ \text{Effective Strength} = \text{Nominal Strength} \times (1 - \text{Defect Factor}) ] Where:

• Defect Factor depends on defect type, size, and position.

Summary Table: Common Cane Defects and Effects

flowchart LR
    A[Start: Cane Inspection] --> B{Defect Present?}
    B -- No --> C[Accept Cane]
    B -- Yes --> D[Classify Defect Type]
    D --> E[Assess Severity]
    E --> F[Calculate Strength Reduction]
    F --> G[Decide Usability]
    G -- Usable --> C
    G -- Not Usable --> H[Reject Cane]

For detailed assessment, always cross-reference IS 707 for timber defect definitions and IS 15458 for cane-specific criteria.

Seasoning and Treatment of Rattan (IS 15458)

Definitions:

• Seasoned Rattan (Clause 4.18): Cane with moisture content reduced to a specified minimum by controlled drying.
• Treated Rattan (Clause 4.19): Cane chemically treated to prevent biological degradation.

Key Specifications for Seasoning & Treatment:

• Moisture Content: Must be reduced to a minimum level (typically 8-12%) to prevent fungal or insect attack.
• Treatment Chemicals: Usually preservatives like borates, copper compounds, or other fungicides/insecticides.
• Process:
  • Seasoning by air drying or kiln drying under controlled humidity and temperature.
  • Treatment by soaking, brushing, or pressure impregnation with preservatives.

Classification (Clause 7.4 & Table 1):

Rattan species are classified by:

• End Use: Furniture frames, seats/backs, walking sticks, handicrafts.
• Diameter Class: Large or Small.
• Average Basic Specific Gravity: Ranges approx. 0.4 to 0.6.
• Strength Class: I, II, or unclassified.

Summary Diagram of Process:

flowchart TD
    A[Rattan Harvesting] --> B[Seasoning (Drying)]
    B --> C{Moisture Content < Specified Limit?}
    C -- No --> B
    C -- Yes --> D[Treatment with Chemicals]
    D --> E[Storage/Use]

Note: For detailed chemical concentrations, drying times, and moisture limits, refer to IS 15458 full text or relevant treatment standards.

IS 15458 - Nomenclature and Vernacular Names of Indian Rattans

Key Specifications (Clause 7.4 & Table 1)

• Classification includes:
  • Botanical Name
  • Vernacular/Trade Name
  • Distribution (source)
  • Diameter Class (Large/Small)
  • Average Basic Specific Gravity
  • Strength Class (I, II, or unclassified)

Sample Extract from Table 1

Notes on Vernacular Names

• Vernacular names vary widely by region and dialect.
• Standardization follows Kerala Forest Research Institute usage.
• Names aid regional community and trade identification.

Summary

• Use Table 1 for species selection by end-use category.
• Refer to specific gravity and strength class for mechanical property guidance.
• Vernacular names are for regional reference only.

flowchart TD
    A[Botanical Name] --> B[Vernacular/Trade Name]
    B --> C[Distribution]
    C --> D[Diameter Class]
    D --> E[Specific Gravity]
    E --> F[Strength Class]
    F --> G[End-Use Suitability]

This classification supports material selection for furniture, chair seats, walking sticks, and handicrafts as per IS 15458.