What is the minimum number of model trees to be sampled?

A minimum of 5 representative model trees should be selected from a given locality for a specific species.

Why must the North direction be marked on trees before felling?

To allow researchers and technologists to evaluate directional wood properties and growth ring variations relative to sun exposure.

How should test logs be protected during transportation to the testing laboratory?

The ends of the logs must be thoroughly end-coated immediately after cutting to prevent rapid moisture loss and subsequent end checks or splits.

IS 2455

: 1990

Method of sampling of model trees and logs and their conversion for timber testing

CurrentSpecializedTesting MethodMaterials Science · Timber and Timber Stores

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This standard lays down the methodology for selecting, felling, and sampling model trees from forests. It details the procedures for marking, cross-cutting into logs, and their systematic conversion into standard-sized sticks to prepare small clear specimens for physical and mechanical timber testing.

Method of sampling of model trees and logs and their conversion for timber testing

Quick Reference Values

minimum trees per locality5 trees

standard log length3 m (typically)

stump height clearance30 cm to 60 cm from ground level

Practical Notes

Always mark the North direction on the trunk before felling to trace anisotropic property variations in the wood.

End-coat the logs immediately after cross-cutting with coal tar, bitumen, or thick paint to prevent end-splitting and moisture loss during transit.

Ensure accurate recording of the locality, soil type, and elevation where the trees were sampled for context during testing.