Concrete formwork is the temporary mold that holds fresh concrete in shape until it gains full strength — from foundations and columns to walls and slabs. Choosing the right formwork system directly affects structural quality, construction speed and total project cost.
With more than two decades of experience in manufacturing steel and plastic concrete formwork, Alborz Ghaleb covers everything in this guide: formwork types, comparison tables, the factors behind formwork prices, a quick cost-estimation formula and a buying checklist. We export to Iraq, Turkey, Armenia, Russia and CIS countries.
Steel & Plastic Concrete Formwork — Buy Directly from the Factory
Modular Steel Formwork
Made of ST37 steel sheet with laser cutting and certified welds. Up to 150 reuses — ideal for foundations, columns, walls and heavy-duty projects.
View steel formwork
Plastic (Polymer) Formwork
One-third the weight of steel, rust-proof and oil-free. The economical choice for residential projects and humid climates.
View plastic formworkWhat Is Concrete Formwork and Why Does It Matter?
1) Resisting hydrostatic pressure
As concrete is pumped, lateral pressure on the panels rises sharply with pour height. Without properly welded, thick-sheet modular steel panels, the form can bulge or even blow out.
2) Dimensional accuracy and plumb structure
Every centimetre of deviation in foundation or column formwork multiplies into tens of centimetres of error on upper floors. On tall structures, stability is provided by modular scaffolding and adjustable steel props.
3) Role in concrete curing
Formwork also acts as a protective layer that prevents rapid moisture loss in the first hours of cement hydration. The interior surface quality decides whether you strip a smooth exposed finish or a honeycombed surface needing costly repair.
Why the right formwork choice matters so much
The right choice cuts total project cost, speeds up execution, reduces waste and delivers a better finish. The wrong formwork leads to rework, grout leakage or even partial collapse and safety hazards. Many contractors look only at the price per kilogram of steel, but the real cost drivers are the number of reuse cycles, ease of stripping (de-shuttering) and dimensional accuracy that prevents concrete waste.
How formwork is used on site — step by step
- Pouring: fresh concrete is placed into the form by pump or bucket;
- Compaction: a vibrator drives out air bubbles so the concrete reaches full density;
- Setting and hardening: within 24–48 hours the concrete takes its initial set and the shape of the form (column, wall, foundation);
- Stripping (de-shuttering): once the required strength is reached, panels are removed and prepared for the next cycle.
Main components of a formwork system
- Form panels (flat panels): the part that holds the concrete and shapes the final surface — steel, plastic or timber;
- Walers and supporting structure (falsework): the steel skeleton that carries the concrete pressure;
- Connectors: pins & wedges, tie bolts and clamps that lock the panels together;
- Spacers, washers and water-stop ties: parts that hold rebar position and seal tie holes during the pour;
- Auxiliary equipment: vibrators, adjustable steel props, modular scaffolding, rebar cutters and other formwork accessories.
What Is Modular Formwork? (The LEGO Philosophy)
Imagine building a separate mold for every column or wall size, then throwing it away. Modular formwork solves this like LEGO: panels come in standard widths (multiples of 5 cm, from 10 to 50 cm) and lengths of 1 / 1.5 / 2 m, joined with pins and wedges.
One set, endless configurations
- Cast a wide foundation today with 50 cm panels;
- Pour 40×40 columns tomorrow with the same panels plus corner pieces;
- Then bolt panels to 3 m height with steel props as raking shores for shear or retaining walls.
Standard panel size table
| Component | Common widths (cm) | Lengths (m) | Typical use |
|---|---|---|---|
| Flat panel | 10–50 (5 cm steps) | 1 / 1.5 / 2 | Walls, foundations, slabs |
| Column panel | 25, 30, 40, 50 | 1 / 1.5 / 2 | Square/rectangular columns |
| Inside/outside corner | 5, 10, 15 | 1 / 1.5 / 2 | Corners and perpendicular joints |
💡 Site tip: combine panels so custom cuts and special pieces are minimized — faster and cheaper.
Types of Concrete Formwork — Expert Review by Material
1) Timber formwork (plywood)
The oldest formwork type, still used on some projects. Built from boards or plywood sheets, it can be fabricated right on site.
- Pros: low upfront cost, light weight, flexibility for complex and curved shapes;
- Cons: short life (max 5–10 uses), high sensitivity to moisture and rot, needs careful design;
- Use: small jobs or special shapes where budget is the priority. Due to deforestation and maintenance cost, its use keeps declining.
2) Steel formwork — king of the jobsite
The world's most popular choice for large projects: ST37 steel sheet (typically 3 mm), produced modular or custom-built.
- Pros: high strength, service life up to 150 uses, smooth concrete surface, fully repairable and rebuildable;
- Cons: heavy weight, more labour and sometimes a crane, higher initial cost;
- Use: dams, bridges, towers and industrial buildings.
3) Plastic (polymer) formwork — technology in the service of lightness
Made of reinforced ABS by plastic-injection machines — first introduced in Italy. Because polymer raw material is widely available, these panels are exceptionally cost-effective in our region.
- Pros: extremely light (one-third of steel), rust-proof, no release oil needed, washable and recyclable;
- Cons: lower resistance under heavy pressure, limits on very large panel sizes;
- Use: residential projects, columns, temporary structures and humid coastal regions (no rust risk).
4) Aluminium formwork
For projects where speed and labour efficiency matter most. Common in countries with expensive labour (Europe, USA), usually produced as an aluminium-timber combination.
- Pros: light weight, corrosion- and moisture-resistant, fast erection;
- Cons: high production cost, possible brittleness under extreme loads, installation complexity;
- Use: advanced industrial projects; less common where labour is cheap.
5) Composite formwork (steel frame + plywood face)
Combines the strength of steel with the flexibility of timber/polymer. The photo below shows a composite panel from our production line:
- Pros: good durability, replaceable face extends service life, flexible;
- Cons: higher production cost, needs maintenance;
- Use: mid-size projects balancing cost and quality. Alborz Ghaleb produces this model with modular connections.
6) Waffle slab formwork
For long spans without intrusive columns, waffle slab formwork enters the field: one-way waffle works like a joist slab but with far better technical performance, sharply cutting concrete and rebar consumption; two-way waffle provides the required stiffness for spans above 12 m in commercial complexes — without making the slab heavy.
7) Shoring and support systems
No formwork survives without proper support. On heavy slabs, adjustable steel props and cross-head jacks with a high safety factor protect both workers and the structure. Our props are produced with unbreakable cast-iron threads so they never settle under the heaviest concrete loads. On tall projects, modular scaffolding (triangular and ringlock type) is the backbone of the whole formwork system.
Full comparison table
| Type | Pros | Cons | Service life (uses) | Best for |
|---|---|---|---|---|
| Modular steel | Strength, smooth finish, fast assembly | Weight, higher initial cost | 100–150 | Bridges, tanks, towers, mass projects |
| Plastic polymer | Light, rust-proof, no release oil | Lower pressure capacity | 50–100 | Residential, columns, humid areas |
| Timber/plywood | Flexible shapes, cheap upfront | Short life, moisture-sensitive | 5–15 | Small jobs, special forms |
| Aluminium | Light, corrosion-proof, quick set-up | Expensive, brittle under extreme load | 80–120 | Advanced industrial projects |
| Composite | Replaceable face, balanced cost | Needs maintenance | varies | Mid-size projects |
| Waffle pans | 30% lighter slabs, long spans | Needs props & shoring | 50+ | Exposed ribbed ceilings |
Steel Formwork Families and Their Features
Steel formwork itself splits into several families, each engineered for a specific kind of project:
a) Modular steel formwork
Panels connect like puzzle pieces: 3 mm steel sheet, 5–6 cm flanges with bean-shaped, star or round punch holes; joined with pins & wedges or frog pins. Suitable for foundations, columns, small walls, beams and slabs. Tip: for large walls, large-panel wall formwork is more economical.
b) Large-panel steel formwork
Big monolithic panels in custom sizes (e.g. 2×3 m) for large structures. Pros: fewer joints in the concrete, fast execution, high rigidity. Cons: more weight and crane required. Use: tall walls, dams, concrete tanks and anywhere a uniform smooth face is needed.
c) Tunnel-form steel formwork
Tunnel formwork is the number-one choice for mass housing: walls, slab and columns are formed in a single operation. Pros: exceptional speed, lower labour cost, uniform quality. Cons: high initial design cost, low flexibility. Use: towers and residential complexes with repetitive floors.
d) Custom (special) formwork
Purpose-designed for one unique project: decorative structures, special bridges, non-standard tunnels, circular columns. Outstanding precision on complex shapes, but higher production cost, limited to that project. Alborz Ghaleb can fabricate these forms in full detail from your drawings.
Concrete Formwork Price — Cost Factors & Quick Estimation Formula
Formwork prices track daily steel-sheet rates, currency exchange and polymer costs. Five factors decide your final number:
- Material & thickness: steel costs more upfront but its 150-use life gives the lowest cost per pour;
- Panel size and type: large panels and custom pieces cost more;
- Accessories: pins & wedges, tie bolts, clamps;
- Order volume and freight;
- New vs. used: inspected second-hand formwork is available at lower prices, and trade-in of your used panels is possible.
Rule-of-thumb formula
Example: a 30 m × 3 m wall = 90 m²; with 25 kg/m² panels, the steel part is based on ≈2,250 kg of sheet, plus hardware and shipping.
Buying Guide — 4 Questions Before You Order
1. What kind of project?
Towers, bridges, industrial → modular steel or large panels. Villas and housing → plastic or plywood.
2. How many reuse cycles?
High repetition → steel is cheapest long-term; one-off jobs → rent or buy inspected used panels.
3. Exposed concrete finish?
For a smooth architectural finish → plastic panels or new steel with intact faces.
4. Crane and skilled crew available?
No crane → lightweight polymer. Full equipment → steel with confidence.
Send your AutoCAD drawing or bill of quantities on WhatsApp — our engineers analyse it free of charge and return an optimized purchase list.
Where Concrete Formwork Is Used
High-rise towers
Steel and tunnel-form systems resist wind and pressure on tall structures.
Bridges
Heavy-duty steel and custom forms that withstand load and weather.
Pools, tanks, tunnels & industry
Smooth watertight surfaces with minimal leakage; modular speed for dams and tunnels.
Manufactured by Alborz Ghaleb — Export to the Region
Our production line in Karaj (Kamalshahr), Iran uses Mobarakeh steel sheet, laser cutting and weld quality control to produce modular steel, polymer, large-panel and custom formwork (round, rectangular, special shapes). Factory visits are welcome by appointment. We ship across Iran and export to Iraq, Turkey, Armenia, Russia and CIS countries with official invoices.
4 golden rules to extend formwork life
- Clean panel faces immediately after stripping;
- Oil steel faces before every pour;
- Inspect welds, holes and panel flatness periodically;
- Store dry and stack flat to prevent warping.
Concrete Formwork — FAQ
How much does concrete formwork cost?
Steel or plastic formwork — which is better?
Is second-hand formwork worth buying?
Do you export concrete formwork?
Can I visit the factory?
Why is formwork so important in construction projects?
How do I get an exact formwork quote?
Get Today's Formwork Price Now
Send your drawing or item list — our engineering team returns an optimized purchase list and official proforma within hours. Shipping across Iran and export to the region.