- The table below shows four classes of timber defects
Seasoning |
Decay |
Growth |
Insect Attack |
|
|
|
|
Copy the table and use it to classify the following timber defects:
check split
knot wet rot
dry rot borers
wane warp
case hardening sharp
(b) (i) List the two main classifications of plastics.
(ii) Explain the difference between the two classes of plastics listed in 3(b)(i).