21 mm Plastic Formwork Boards & Prices
21 mm heavy-duty polymer formwork panels are engineered for extreme fresh concrete hydrostatic pressures in tunnel, civil infrastructure, and heavy precast applications. Delivering superior stiffness and 60 to 80+ pour cycles without deformation.
21 mm · 41 kg
100% PP Honeycomb Core
Vertical cellular ribs prevent bending
Mirror Concrete Finish
Fair-faced finish, ready to paint
Dispatched from Gebze
Strapped and edge-protected pallets
21 mm Polymer Formwork Technical Specifications
| Product Code (SKU) | SPW-21-1250-2500 |
|---|---|
| Nominal Thickness | 21 mm (±0.3 mm) |
| Standard Dimensions | 1250 × 2500 mm (125 × 250 cm = 3.125 m²) |
| Optional Dimensions | 625 mm modular width / Custom project lengths available |
| Net Sheet Weight | 41 kg (13.12 kg/m²) |
| Color Options | Standard White (Custom: Gray & Black) |
| Section Structure | Vertical Cellular Honeycomb Structure |
| Raw Material Composition | 100% Modified Polipropilen (PP) + UV Stabilizers |
| Modulus of Elasticity (E) | 3.550 MPa (ISO 178) |
| Flexural Strength | 32.0 MPa (ISO 178) |
| Impact Strength (Izod) | 14.0 kJ/m² (ISO 179 Izod) |
| Surface Hardness | 74 Shore D (ISO 868) |
| Water Absorption | 0.00% (Completely Waterproof & Moisture-Proof) |
| Operating Temperature | -20°C to +60°C |
| Fresh Concrete Pressure Limit | 75 kN/m² |
| Recommended Support Span | 30 – 35 cm (Subject to slab load) |
| Reuse Cycles | 60 – 80+ Pours |
| Pallet Packaging | 30 Sheets / Pallet (~93.75 m² / 1,255 kg) |
21 mm Commercial Pricing Policy
21 mm polymer formwork price is tailored to order quantity (pallet / truckload / container FCL) and delivery destination.
Estimate Required Sheet Count
Request Site Sample
We provide direct jobsite board samples for your concrete pour trial tests.
H20 Girder Spacing & Deflection Load Ratings
Deflection performance under fresh concrete loads according to DIN 18202 Table 3 flatness standards.
| Joist Spacing | Concrete Pressure | Calculated Deflection | Deflection Ratio | Recommended Jobsite Application |
|---|---|---|---|---|
| 25 cm | 75 kN/m² | 0.4 mm | L/625 | Tunnel formwork, viaducts & heavy civil |
| 30 cm | 65 kN/m² | 0.6 mm | L/500 | High retaining walls & climbing formwork |
| 35 cm | 50 kN/m² | 1.0 mm | L/350 | Wide joist spacing heavy load slabs |
★ Minimal deflection ensures flat fair-faced architectural concrete with zero plaster remedial costs.
Direct Comparison: Polymer Formwork vs. Birch Plywood
Why engineered cellular polymer boards outperform traditional timber plywood on modern sites.
| Formwork Metric | Traditional Birch Plywood (18mm) | SerPlywood 100% Polymer Board | Jobsite Advantage |
|---|---|---|---|
| Concrete Pour Lifespan | 8 – 10 Pours (Rapid wear) | 60 – 80+ Pours | 5x to 7x Longer Service Life |
| Moisture & Water Proofing | 15% – 20% Water Absorption (Swelling & delamination) | 0.00% (100% Waterproof) | Zero Delamination or Swelling |
| Release Agent Consumption | Heavy (Timber absorbs release oil) | Minimal (70% less oil needed) | 70% Savings on Formwork Oil |
| End-of-Life Scrap Value | $0 / Scrap waste (Discarded or incinerated) | 100% Recyclable Scrap Value | Residual Capital Recovery |
| Amortized Cost per Pour | ~$4.50 – $5.50 / pour | ~$0.85 – $1.15 / pour | 75%+ Formwork Budget Savings |
Recommended Formwork Systems & Structural Applications
Where 21 mm polymer boards deliver peak structural performance.
Logistics & Fleet Payload Capacity (Gebze Hub)
Pallet staging and vehicle payload metrics dispatched from Gebze Logistics Center.
Project Tender Specification Text
Copy-ready specification wording for engineering bills of quantities and institutional tenders.
30 – 35 cm Joist Spacing
21 mm panels operate with zero deflection over 30 – 35 cm spaced H20 timber girders.
Nail & Screw Retention
Fastened with standard nails and screws without cracking edges or admitting moisture.
Fair-Faced Concrete Finish
Smooth polymer skin produces mirror architectural concrete ready for direct finishing.
21 mm Polymer Formwork FAQs
Frequently Asked Questions
Common questions regarding board selection, reuse cycles, technical parameters, and global delivery.
It is a widely used commercial term for polymer sheets used as concrete formwork facing. When evaluating the product, the polymer type (PP or PVC), internal cross-section, dimensions, and manufacturer instructions must be assessed together.
The polymer name alone is not a sufficient selection criterion. Internal cross-section (solid, honeycomb, or fluted), weight, test certificates, jobsite temperature ranges, and pricing must all be evaluated together.
They describe the internal cross-sectional geometry of the board. Honeycomb and cellular structures provide lightweight handling, while solid core boards offer different deflection and impact dynamics.
Thickness alone does not determine full suitability. Polymer structure, fresh concrete hydrostatic pressure, support joist spacing, and framing connections must be evaluated within a proper formwork design.
Pricing is determined by thickness (15, 18, 21 mm), cellular honeycomb engineering, order volume (sheets, pallets, full container/truckload), and delivery terms (jobsite, warehouse, or seaport).
Domestic orders can be settled via bank transfer, card, or cash. International export orders are handled via Wire Transfer (T/T) or Letter of Credit (L/C) under agreed commercial terms.