How many times can you reuse formwork plywood?
There is no single number. Reuse runs from about 3 to 5 pours for a bare or CDX exterior panel, up to 10 for a standard Class 2 melamine-core film-faced panel (Form Basic, Eco Form), up to 15 for a higher-melamine-content Class 2 panel (Form Extra), and up to 20 for a Class 3 phenolic film-faced board (Pro Form, HDO range). These are maximums under good site care. Adhesive class, film grammage and handling discipline set where a given panel lands.
Why do Form Basic and Form Extra reuse differently if they share a face film?
Both panels carry the same phenolic face film and both are EN 636-2 / Class 2. Form Extra reaches up to 15 cycles where Form Basic reaches up to 10 because its core is bonded with a more durable, higher-melamine-content MUF glue, not because it has a heavier film or different veneer. "Melamine" here means the melamine-urea-formaldehyde core resin, not decorative laminate. A Class 2 panel will not deliver Class 3 numbers; for up to 20 cycles you need a genuinely phenolic-bonded board.
What shortens formwork plywood reuse on site?
Most early failures come from handling, not the panel. The usual causes are unsealed cut edges that absorb water, storing panels flat on wet ground, skipping release agent before a pour, and stripping with a steel bar that cuts the film and lifts a face ply. Sealing every cut edge the same day, storing flat and under cover, applying release agent before each pour, and striking with wedges are what carry a panel to the top of its reuse band.
How many reuses should I plan for when bidding a job?
Bid against roughly 60 to 80 percent of the catalogue maximum, not the headline figure. A panel rated up to 20 might return 12 to 16 on a typical mixed-crew commercial job, and one rated up to 10 might return 6 to 8. The catalogue number assumes good conditions throughout; estimating against it is how a formwork budget runs short partway through the programme.
