Parquet hardness: wood hardness and parquet resistance, measurement methods
There parquet hardness indicates the resistance that the wooden parquet opposes to its penetration. It is a very important value in the definition of a resistant parquet , both for woodworking (cutting and sanding) and for the effect that on the flooring can cause various kinds of impacts, caused by accidental fall of materials, effect of stiletto heels, etc.
The most common methods to determine the hardness of the parquet and, therefore, the resistance of the wood, are:
– Janca method: consists in identifying the load necessary to make a steel hemisphere completely penetrate the wood having surface of l cm 2 . The value is indicated in kq / cm 2 .
– Brinell method: measures the diameter of the circular imprint left in the wood by a steel ball (generally 10mm in diameter) loaded with a load varying from 10 to 100 kg depending on the hardness of the wood (on average 50 kg are loaded). Hardness is expressed in Kg / mm 2 . Below is the reference table
|BRINELL HARDNESS TABLE||KG / mm2|
|Bamboo Strand Woven||9.5|
|Horizontal and Vertical Bamboo||4.7|