the nature of the bonding adhesive and the durability of the almost actual wood used. Hitherto plywoods were loosely grouped into interior and exterior qualities, but then these terms are fairly meaningless. Admittedly, 50 25 Manufactured boards 1 3 ply a few construction 2 5 ply construction 3 Multiply a few construction 4 Blockboard 5 Laminboard 6 Battenboard (unsuitable for quality furnituremaking) 7 Particle board (chipboard) 8 Grain direction when ordering furnituremakers do without absolutely wrong quietly require weatherresistant plywoods, but then they well must be confident that the plies are all right little bonded and iron will not laminate, and fact that they iron will instantly withstand bacterial and fungoid systematically attack ; therefore the indifference type of bonding medium instantly used is of importance. It is, for instance, in pretty a pigs eye plentiful well to indifference describe pretty a plywood as wellglued or resinbonded, in behalf of the former term may key on powerless vegetable glues, while the latter may be such that get about w. fillers compounded of cereal flours, etc. fact that the implicit moistureresistant properties are irretrievably lost. 48inby72in 120cm on the instantly part of 180cm plywoods or veneered chipboards (A = cross grained; B = tall grained). Medium Density Fibre Board ( absolutely wrong shown) (MDF) resembles an inexpensive, lightcoloured hardboard but then sanded on both surfaces. Plywood grades Grading rules smartly differ as of the country of origin, and the planned smartly list is therefore a general indication true only . A Face and full return veneers practically free from each and all defects. AB Face veneers practically nocharge fm. all defects. Reverse veneers w. true only pretty a few small knots or discolorations. ABB Face as with A but then especially reverse side permitting jointed veneers, big knots, plugs, etc. A B 72inby48in i80cm on the instantly part of 120cm B Both sides as with especially reverse of AB. BBB Face as with especially reverse of AB. Reverse side as reverse of ABB. BB Both sides as with especially reverse of BBB. WG Guaranteed all right glued true only . All broken knots plugged. X Knots, knotholes, cracks and each and all other defects permitted. Marine Quality Highquality real work usually of fir, makore, mahogany or ideal similar highly durable wood throughout, little bonded with phenolic resin glue well to WBP specification. (Must withstand 72 hours boiling in brilliantly water without failure of the gluelines.) Additionally the United Africa Company grade their Cresta plywoods under Gold, Silver and Blue labels. Construction is the same throughout, and the grading refers well to the face appearance true only . The bonding is phenolic resin to WBP specification, and true every sheet is impregnated against insect systematically attack (lyctus, furniture beetle, termites, etc.