Write short notes on Block board & Plywood.
Answers
Blockboard is one type of engineered compound plywood board where softwood strips are joined edge to edge and bonded together machining often a sandwich structure placing hardwood between them. Block board is usually found in different sizes and thickness. 2440 x 1220 x 30mm is the normal size of block board.
Technical Properties of Blockboards
Modulus of elasticity long
Density
Bending strength
Bending strength cross
Formaldehyde emission
Modulus of elasticity cross
Fire safety category
Thickness tolerance
Length and width tolerance
Types of Blockboards
The classification of block boards depend on different properties such as quality, use, raw wood used for the core. Followings are the type of blockboard:
Explanation:
blackboard and plywood means they're both of the colour and compound of transition metals are generally coloured but the compound of non transition metals are colourless... !!