Formwork is the term used for the process of creating a temporary mould into which concrete is poured and formed. Traditional formwork is fabricated using film faced plywood, but it can also be constructed from steel, glass fibre reinforced plastics and other materials.
As the most traditional formwork timber, plywood has a lot of unique properties that can make the formwork better.
Plywood is light weight and durable compared with timber. Even though timber is very hard, it is easy to bend over time. The plywood panel can keep its flatness for quite a long time.
There are different types of plywood used in the formwork.
Phenolic Film Faced Plywood
Both sides of the plywood are coated with phenolic film. The film can be either black or brown. The film can make the concrete finish smooth. Most formwork plywood produced in Chinese plywood factories are phenolic film faced.
Chinese film faced plywood are unique with its poplar core which is durable and cheap at the same time.
Compared with the eucalyptus plywood produced in vietnam, the poplar price is about 20% lower.
Veneer Faced Plyform Panels
Plyform panels are structural plywood with pine face or hardwood face. They are are designed for concrete pouring for foundations, bridges, tunnels, and more. Each panel has a special finish and releases agent that is uniquely designed to maximize the number of pours and quality of finish.
High Density Overlay (HDO) Plyform Plywood
This Plyform panel has same general specifications as Plyform Structural. All HDO faced plywood have a hard, semi-opaque surface of thermosetting phenolic resin-impregnated material that forms a durable coating on plywood surface.
During plywood production, HDO are bonded to the plywood surface under heat and pressure in the hot press process.
The opaque verlay add stability, repel foreign substances from the surface and provide a smoother and more durable forming surface. The thermosetting phenolic resins used in overlay production are hard and resist moisture.