Thermoplastic polymer of propylene (propene).

Styrene (vinylbenzene) polymerization product, linear thermoplastic polymer.

A group of thermoplastics, polyethers of carbonic acid and dicatomic alcohols of the general formula (-O-R-O-CO-)n.

Beech wood is very hard and has a density of 720 kg/m³. It is homogeneous in density, ductile, low elasticity and has a good strength.

The density of birch wood is about 650 kg/m³. Elastic and ductile, birch wood has medium bending strength and is difficult to split.