The thickness is 33mm, and the core is made a line of round hole, and its diameter is 25mm.
The distance between two round hole is 4mm. The distance from the edge of the hole to the
surface of the board is 4mm. The weight is light, and it is the half of traditional particle 
board.But the physical character is very good, and strength of strike-resistant is 
20kgs/cm2, and the heat character is same and the heat character is same as traditional  
brick,and sound insulation exceed 260 decibels, dilatability in the water is less than 1.5%.
The sound and heat resistant are outstanding because of the hole structure of the products,
and especially fitting for the core board of the plain board door and the obstruct of big office.