Such field under strong blows can begin crumbles directly under cloth that the movement of the sphere sliding on a site with defect naturally breaks a trajectory.
It is considered that the best material of a field is graphite slate. Such plate very heavy as has thickness of 45 mm. It is made of strong slate. Even as a result of falling on its surface of a sphere from height more than a meter does not remain even dents, not to mention a crack.
Usually the table framework with legs is produced from the massif of strong breeds of a tree. It can be an oak, a beech, an ash-tree or even an alder. Because of high cost in billiards clubs tables from MDF often meet. They cost cheaper, thus very strong as are made of dense material. Their advantage is the reduced sensitivity to fluctuations of temperature and humidity.
This production technology is absolutely identical to that, as is applied to production of table-tops from an artificial stone which is used for arrangement of kitchen.
Choice of this material quite misleading as similar wood is subject to deformation under loadings or as a result of fluctuation of temperature. Actually requirements to the basis of a table is made of what material is a matter of taste.
The weight of tables can make more than a ton if they are produced from exclusive materials. First of all representatives of heavy tables are marble products.
Some producers, and also private masters, can make a billiard table of a pine and a fir, because of low cost of such wood.