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ASTM D 143 : 2023



The latest, up-to-date edition.

Standard Test Methods for Small Clear Specimens of Timber

Available format(s)

Hardcopy , PDF



Published date


1.1These test methods cover the determination of various strength and related properties of wood by testing small clear specimens.

1.1.1These test methods represent procedures for evaluating the different mechanical and physical properties, controlling factors such as specimen size, moisture content, temperature, and rate of loading.

1.1.2Sampling and collection of material is discussed in Practice D5536. Sample data, computation sheets, and cards have been incorporated, which were of assistance to the investigator in systematizing records.

1.1.3The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. When a weight is prescribed, the basic inch-pound unit of weight (lbf) and the basic SI unit of mass (Kg) are cited.

1.2The procedures for the various tests appear in the following order:


Photographs of Specimens


Control of Moisture Content and Temperature


Record of Heartwood and Sapwood


Static Bending


Compression Parallel to Grain


Impact Bending




Compression Perpendicular to Grain




Shear Parallel to Grain




Tension Parallel to Grain


Tension Perpendicular to Grain


Nail Withdrawal


Specific Gravity and Shrinkage in Volume


Radial and Tangential Shrinkage


Moisture Determination


Permissible Variations




1.3This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

D 07
Test Method
American Society for Testing and Materials

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