Shuttering Plywood: Types, Bond Class and Formwork Specs
Shuttering plywood for concrete formwork: types, bond class, sizes and reuse. Class 3 covers Pro Form, Pro Form Lite, HDO Standard, HDO Premium and MatteFace Panel 1S, 2S, 1SF and HD 1SF (Eco 1SF is Class 2). Est. 1992, 55+ countries.
Shuttering plywood is what the crew pours against. Wet concrete goes in, sits for a day or two, and the sheet comes off so the gang can leapfrog to the next bay. Names vary on site (shutter, form face, mould), but nobody on a pour cares much what you call it. What they care about is a panel that does not bow at the bottom of a 3 m lift, gives the architect a flat face, and strips without the outer ply peeling back at the edge.
Ask for it in Mumbai or Manchester and you say shuttering ply. In Sydney it is form ply. A US estimator writes concrete form plywood or plyform on the take-off, and buyers across the Gulf and Southeast Asia mostly just order film-faced. Same sheet. Four specs decide how the concrete looks and how many pours you get out of it (overlay, core bond, size, emission class), and they should be on the RFQ before price comes up. The North American plyform angle is covered in concrete forming plywood.
Pick the panel and you have more or less picked the finish, the reuse count and so the real cost per pour. A cheap sheet that dies on cycle four is the expensive one. Our reuse numbers are ceilings under good site practice, so we always write them as "up to N", and it is worth copying that wording onto your own RFQ.
How shuttering plywood works in concrete formwork
For the first few hours fresh concrete acts like a dense fluid, and it leans on every form face. How hard depends on lift height, how fast the pump is placing it, and mix temperature; a cold mix poured fast up a tall wall is the worst case, a warm slow pour much gentler. Panel thickness and stud or waler spacing come from the formwork designer, who works those conditions through a recognised design method. Get it wrong and the wall is out of plumb long before anyone argues about film colour. Release matters too, because a rough, thirsty face grabs the cement paste and tears both the concrete skin and the sheet at stripping.
General construction plywood is a poor stand-in. Plenty of it is bonded with MR (moisture-resistant urea) glue, and a long wet pour starts lifting the veneers within a few cycles. The panel goes soft. Then the face prints blotchy on the concrete. We cover water resistance versus the "waterproof" claim in is shuttering plywood waterproof.
One mix-up we still see on orders: centring ply versus shuttering ply. Same family of panel, different position. Shuttering stands vertical on walls, columns and beam sides; centring (or centering) lies flat as the slab soffit. Either way you want a WBP bond that resists water, a face that releases, and thickness that holds after repeated soaking. IS 303 still calls the glue group BWP. That is just the Indian name for the adhesive class, not a claim that the board is a sealed tank.
Types of shuttering plywood
Buyers ask us for the best shuttering plywood all the time, and honestly there isn't one. The right sheet is the cheapest grade whose glue class and reuse ceiling still cover your programme. So start with the finish the spec demands, then think about how many wet weeks the panels will sit out, and only then count planned cycles. Hidden footings for a few pours? Form Basic or Eco Form Plus is plenty. A long, humid job with an average finish leans toward Form Extra or Pro Form Lite, and exposed fair-face concrete over many cycles is Pro Form, HDO or MatteFace territory.
Film and core resin are two separate choices, and a catalogue photo shows you neither. Slapping a heavier film on an MUF core doesn't make it Class 3, however dark it looks. Settle overlay and glue first. Then compare quotes.
| Type | Face | Core bond | Reuse (Vinawood maxima) | Best for |
|---|---|---|---|---|
| Plain sanded veneer | No film | MR or WBP | single-use to a handful of pours | Edge forms, light residential |
| Eco Form Plus | Phenolic face film | MUF, EN 636-2 | up to 8 | Entry film-faced programmes, short cycles |
| Form Basic | Phenolic face film | MUF, EN 636-2 | up to 10 | Shorter WBP programmes |
| Form Extra | Same phenolic face film as Form Basic | Superior Glue MUF, EN 636-2 | up to 15 | Formwork in humid conditions. It is not Class 3. |
| Pro Form Lite | Phenolic face film 165 g/m² | WBP phenolic (PF), EN 636-3 | up to 15 | Sits between Form Extra and Pro Form, with a mixed-grade plantation core. |
| Pro Form | Phenolic face film | WBP phenolic (PF), EN 636-3 | up to 20 | Fair-face, high-cycle work at Class 3 |
| HDO Basic | High-density overlay | WBP variant, EN 636-2 / Class 2 | up to 10 | North American formwork where a Class 2 bond is enough. See HDO plywood. |
| HDO Standard / HDO Premium | High-density overlay | WBP phenolic (PF), EN 636-3 | up to 20 (Standard, Standard HD, Premium and Premium HD) | North American architectural concrete at Class 3 |
| MatteFace Plywood (MTF) | Matte phenolic surface film | Panel 1S, Panel 2S, 1SF and HD 1SF: WBP phenolic (PF), EN 636-3 / Class 3. Eco 1SF: MUF, EN 636-2 / Class 2. | up to 15 | Matte architectural walls. Buyers who search for MDO formwork plywood usually mean this matte phenolic face; the overlay differences are set out in film-faced vs MDO vs HDO. |
"Melamine" on a shuttering quote is a trap word. Sometimes the seller means the MUF resin in the core; sometimes a lighter face film; occasionally the printed decorative laminate that goes on kitchen carcasses, which has nothing to do with formwork. Make them spell it out. Form Extra is a good example of why: MUF core, phenolic face, EN 636-2, and its extra reuse comes from the glue chemistry, not the film. Still not Class 3.
Colour isn't a grade. Black shuttering plywood and brown shuttering plywood are both phenolic-impregnated paper, and the dye tells you nothing about bond class or reuse. Film weight plus core resin is what counts: 165 g/m² film on a PF core (Pro Form Lite) is Class 3 at up to 15 cycles, while phenolic film on MUF (Form Extra) stays EN 636-2. If a quote just says "black film", ask for the core glue, the EN 636 class and the film gsm on the technical data sheet. Skip that and you usually find out in the third wet week.
Standard sizes and thicknesses
The usual shuttering sheet is 1220 × 2440 mm (4 ft × 8 ft). Its metric sister, 1250 × 2500 mm, is common in Europe and the Middle East and is a stock format on our film-faced lines. Custom sizes exist for modular systems, but check the frame dimensions before assuming the gang will take the sheet.
Thickness follows pour height and stud spacing. 12 mm suits slab edges, kickers and small beam sides, and only works on a full-height wall if the framing is very tight, whereas 15 mm covers medium slabs, low walls and columns on closer centres. 18 mm is the workhorse for walls and columns, and most contractors who ask for "shuttering ply" mean this one. Deep lifts and foundation walls, or any pour where deflection limits are strict, move up to 21 mm or 25 mm. More sizing notes by application are on plywood for concrete forms.
IS 303 and EN 315 both set thickness tolerances, and for good reason. Panels that wander by more than half a millimetre open the joints, bleed paste and leave a step in the finished concrete. When a site complains about that, the cause is usually calibration at the press rather than anything to do with the film.
How to read a shuttering plywood specification
A proper specification lets you tell a real forming panel from a nice colour photograph, and five fields do most of that work. Put all five on the RFQ and expect the supplier to answer each one in writing. A mill that cannot name its core resin is telling you something important about the rest of its paperwork.
- Face grade. A/B means one clean face, while B/B means repairs are allowed on both sides. Open defects on the concrete-contact face print straight through, so B/B or better is the sensible floor for shuttering.
- Core bond. Keep this separate from the film. EN 636-3 is the exterior service class, and on our list that means Pro Form, Pro Form Lite, HDO Standard, HDO Premium, and MatteFace Panel 1S, Panel 2S, 1SF and HD 1SF, all on WBP phenolic (PF) glue. HDO Basic, MatteFace Eco 1SF and the MUF grades (Form Extra, Form Basic and Eco Form Plus) sit at EN 636-2 / Class 2, and MR urea is not a shuttering glue at all.
- Overlay and film weight. Film weight is given in grams per square metre, and Pro Form Lite, for instance, carries a 165 g/m² phenolic face film. A heavier film usually lasts longer under abrasion. It still does not turn an MUF core into Class 3.
- Core species. We peel plantation-grown Acacia, Eucalyptus or Hevea. A hardwood export core grips screws and stays flatter than packing-grade fill. You will find the odd small void in any hardwood core; it only bites when it surfaces at an edge nobody sealed.
- Edge sealing. Cut edges drink water on every cycle. Panels leave the factory with sealed edges, and crews should reseal after every site trim, because that one habit does more for reuse than a heavier film on a neglected sheet.
Reuse count: how many times can shuttering plywood be used?
Reuse is always an "up to" figure, because site handling usually uses up a sheet's life before the glue line does. Under good practice our maxima are up to 8 cycles for Eco Form Plus and up to 10 for Form Basic and HDO Basic. Form Extra (MUF, EN 636-2), Pro Form Lite (PF, 165 g/m²) and MatteFace reach up to 15, with the MatteFace Panel 1S, Panel 2S, 1SF and HD 1SF grades rated Class 3 and MatteFace Eco 1SF rated Class 2. Pro Form, HDO Standard and HDO Premium, including the HD versions, go up to 20.
Sheets die on site far more often than they fail in the press. Missing release agent is the usual start, followed by corners dragged across gravel, stacks left on edge in the rain and steel bars used to prise panels off at stripping. Unsealed cuts finish the job. I have watched return pallets come back where the bond was still sound and the film was shredded at the corners, which makes it a site problem rather than a glue problem.
Cost per pour still beats a cheap headline price. A higher-grade sheet that reaches its "up to N" window often works out cheaper per cycle than a light panel that has to be replaced halfway through the programme. We quote per container against a filled-in specification, so send the grade, thickness and planned pour count and the comparison becomes straightforward.
Domestic mill vs Vietnam mill
Indian buyers often weigh a BIS-licensed local mill against a Vietnamese exporter. It is really availability against container economics. Job size usually decides it.
Go domestic and you get stock down the road, no container minimum and a short wait. Good for small residential sites, or any job where the BIS mark has to be on the sheet. Spec IS 303 BWP Grade (Group 1) for shuttering; MR Grade (Group 2) is the wrong glue group for wet concrete.
We have been pressing plywood in Vietnam since 1992. Our film-faced export grades ship with WBP test reports, plus CE marking to EN 13986 where marked, CARB P2 / TSCA Title VI for US lots and FSC-COC if the project wants it. IS 303 BWP and WBP both describe a phenolic-type glue line that survives boiling. An imported sheet won't carry a BIS licence, though. If your contract demands the mark, put that on the RFQ up front; if it is performance-based, check the WBP test report instead.
Small spot order off a dealer's counter? Domestic is easier. Once you are into a commercial programme of 100-odd sheets cycling repeatedly, a Vietnamese container usually wins on total cost, so run your pour count against the grade table first.
IS 303 compliance: what India contractors need to know
IS 303 is the general-purpose plywood standard, and it sorts adhesives into groups. Group 1, BWP Grade, is the phenolic boiling-water-resistant glue you want against wet concrete. Group 2 (MR Grade) is urea for dry interiors. Write IS 303 BWP Grade on every shuttering PO, and check Indian-origin stock for the BIS stamp when it lands.
Our imported panels are tested to WBP adhesive performance, a lab check of whether the glue line holds through weathering and boiling. Water-resistant, then, rather than waterproof. UK and EU specifiers use BS EN 636 instead: EN 636-2 is the humid Class 2 (Form Extra, Form Basic, Eco Form Plus, HDO Basic, MatteFace Eco 1SF) and EN 636-3 the exterior Class 3. Our Class 3 grades are Pro Form, Pro Form Lite, HDO Standard, HDO Premium, and MatteFace Panel 1S, Panel 2S, 1SF and HD 1SF.
Sourcing shuttering plywood: local vs import
Dealers win on speed and odd lots. Factory-direct from Vietnam starts to pay once the take-off fills a 40-footer and the spec is actually written down. Lead times shift with vessel schedules and inspection slots, so please don't set a pour date off a blog post. The packing list, mill test reports and Declaration of Performance travel with every lot; if your broker can't read those, the box sits at the port.
On a good RFQ we expect to see species (plantation-grown Acacia, Eucalyptus or Hevea) and bond class written as EN 636-2 or EN 636-3 with the glue named, MUF or PF. Add overlay and film weight, or the HDO or MatteFace grade. Size goes in as 2440 × 1220 or 2500 × 1250 mm with thickness, emission class as CARB P2 / TSCA Title VI or EN 13986 on the CE DoP, and FSC-COC only if the project needs chain of custody.
Vinawood has manufactured plywood in Vietnam since 1992 and ships roughly 5,000 containers a year to more than 55 countries. Our distribution warehouses in Toronto, Vancouver, Calgary, Montreal, Miami, Houston and Baltimore hold ready stock for local distributors. Every sheet goes through a 12-step production process and individual inspection under an ISO 9001 quality system. Send your pour programme and the bond class you need through the RFQ page or the quotation form, and we will quote per container against that specification.
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