Plywood formwork- advantages, types and applications
Plywood formwork is a lightweight, durable and eco-friendly system that provides high quality concrete cast surface. It is prepared by combining the specially prepared three layers on top of each other. Plywood formwork is applicable wherein a large surface needs be coated with a light and durable material. It is especially preferred in molds prepared for pouring concrete in constructions. Usually, plywood boards are made of birch, poplar, spruce, or pine but there are many types of materials used by plywood manufacturers in different parts of the world. While the type of plywood used is important, the real opportunity for making a difference for the final concrete result is the type of coating: the film that is applied on the plywood surface.To get more news about
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Plywood has the natural property to absorb moisture, resulting in a sponge effect. This causes movement of the panels, affects the weight and the mechanical properties of the material, ultimately influencing its life cycle. Its advantages includes-
Different types of plywood formwork panels
Panels are typically used in two ways: as forming panels or as form liners. Forming panels not only impart the desired texture and pattern to the concrete surface but also provide the structural strength and stiffness to hold the fresh concrete in place. Form liners can only import the desired texture and pattern to the concrete; a backing panel carries the load of the concrete. There are different types
Film faced plywood
Film faced plywood is a commonly used panel. Surface film is paper impregnated with a glue/resin. Film faced Formwork plywood have improved resistance to abrasion, moisture penetration, chemicals, insects and fungi. They have a smooth hygienic, easy to clean surface
HDO plywood
HDO forming panels stand for high density overlay that has a greater amount of resin in the overlay; their surfaces are harder and more impervious to water and impacts than MDO forming panels. A greater number of uses and smoother finish on the surface of the concrete can be expected when using HDO Plyform..
MDO plywood
MDO stands for medium density overlay, which is much better/expensive than the surface film for ordinary film faced plywood. The quality surface of concrete comes from MDO’s ability to mask imperfections and reduce the transfer of the wood grain onto the concrete surface. The result of using a medium density overlay is a consistent color and a smooth finish that is ideal for painting or coating.
A wood veneer faced plywood
A wood veneer faced plywood is the cheapest among the three. To use formwork easily, people will print a kind of glue/oil to the face/back of wood veneer faced formwork plywood during production.
Specialty plywood
Specialty plywood forming panels with proprietary overlays are also available e. Overlay materials include laminated plastic, epoxy resin, metal, and glass-fiber-reinforced plastics (fiberglass). The metal and fiberglass overlays may also add stiffness and strength to the panel. Users of these proprietary panels should check with the manufacturer for design specifications and surface treatment recommendations.
Plywood form Grades and categorization
Plyform is manufactured with Exterior bond classification plywood and is limited to certain wood species and veneer grades to assure high performance. Products bearing this specific identification are available in three basic grades: Plyform Class I and Structural I Plyform. Each may be ordered with a High or Medium Density Overlaid surface on one or both sides.
