What are the primary grades defined in this standard?

The standard defines Special Grade, Grade I, and Grade II based on dimensions and permissible defects (Table 1).

What is the maximum allowable moisture content for canes?

The moisture content for all grades of cane shall not exceed 15 percent (Clause 4.3).

Are borer holes permitted in high-quality cane?

No, for Special Grade canes, borer holes are not permitted (Table 1).

How is the diameter of a cane measured?

The diameter is measured at the thickest end of the cane (Clause 5.1.2).

IS 15456

: 2004

Grading rules for unsplit canes

CurrentSpecializedSpecificationMaterials Science · Timber and Timber Stores

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This standard lays down the rules for grading unsplit canes (rattan) based on their general characteristics, dimensions, moisture content, and permissible defects. It establishes three main grades (Special, I, and II) to ensure quality and consistency for use in furniture, handicrafts, and other applications.

Grading rules for unsplit canes

Quick Reference Values

Maximum moisture content15 percent

Minimum length for commercial canes3.0 m

Minimum diameter for Special Grade25 mm

Minimum diameter for Grade I18 mm

Minimum diameter for Grade II12 mm

Borer holes permissibility (Special Grade)Not permitted

Practical Notes

This standard applies to solid canes (like rattan), not hollow bamboos which are covered by separate standards (e.g., IS 6874).

Visual inspection under good lighting is crucial for correctly identifying and quantifying defects like surface cracks, knots, and discoloration as per Table 1.

Moisture content is a critical parameter for preventing fungal decay and ensuring dimensional stability; always verify using a calibrated moisture meter.