Characteristics and Properties of Timber

Front

What marks where a branch once grew out on the tree in timber?

Back

A knot.

Front

Why is it preferable to use timber without knots?

Back

Knots often fall out from planks as they shrink, leaving a hole. Timber without knots is preferable unless used for decorative purposes.

Front

What are the colour characteristics of pine and mahogany timbers?

Back

Pine has a pale-yellow hue, while mahogany has a reddish-brown colour.

Front

How can the colour of timber planks be altered?

Back

The colour can be altered using wax, varnishes, stains, and paints.

Front

What is the difference in growth rings between hardwoods and softwoods?

Back

Hardwoods have growth rings that are close together, while softwoods have growth rings that are further apart.

Front

What are the two types of vessels that run the length of hardwood trees?

Back

Fibres and pores.

Front

What is elasticity in terms of timber properties?

Back

Elasticity is the ability of a material to stretch and return to its original shape. Timbers are generally not very elastic.

Front

Which timber is used for making bows in archery due to its elasticity?

Back

Yew.

Front

What is tensile strength in terms of timber properties?

Back

Tensile strength is the ability of a material to withstand being pulled by a certain amount of force. Timbers have higher tensile strength than compressive strength.

Front

What is compressive strength in terms of timber properties?

Back

Compressive strength is the ability of a material to withstand being crushed by a certain amount of force. The denser the timber, the greater the compressive strength.