• Composite materials (or composites for
short) are engineered materials made from
two or more materials with significantly
different physical or chemical properties
and which remain separate and distinct on
a macroscopic level within the finished
• Engineered wood includes a wide variety of
different products such as plywood, oriented
strand board, wood plastic composite (recycled
wood fiber in polyethylene matrix), Pykrete
(sawdust in ice matrix), Plastic-impregnated or
laminated paper or textiles, Arborite, Formica
(plastic) and Micarta.
• Other engineered laminate composites, such as
Mallite, use a central core of end grain balsa
wood, bonded to surface skins of light alloy or
GRP (glass reinforced plastic). These generate
low-weight, high rigidity materials.
abbreviated as WPC)
is a recyclable
lumber or timber
made of recycled
plastic and wood
• A major advantage over wood is the ability of the
material to be molded.
• It can also be bent and fixed to form strong arching
• Wood-plastic composites behave like wood and can be
shaped using conventional woodworking tools.
• Moisture-resistant and resistant to rot, although they are
not as rigid as wood and may slightly deform in
extremely hot weather.
• A major selling point of these materials is their lack of
need for paint as they are manufactured in a variety of
colors, but are widely available in grays and earth tones.
Oriented strand board
• Oriented strand board, or OSB, or
waferboard, or Sterling board (UK), is an
engineered wood product formed by
layering strands (flakes) of wood in
specific orientations. In appearance it may
have a rough and variegated surface with
the individual strips (around 2.5 by 15 cm
(approx. 1 in by 6 in) each) lying unevenly
across each other
Oriented strand board
• It is manufactured in wide mats from
cross-oriented layers of thin, rectangular
wooden strips compressed and bonded
together with wax and resin adhesives
(95% wood, 5% wax and resin).
OSB- Before being pressed
Resins as composites
• Typically, most common composite
materials, including fiberglass, carbon
fiber, and kevlar, include at least two parts,
the substrate and the resin.