OVERVIEW
What it is. STRATO-STOCK® is a composite formwork panel patented by ILPA in 1994: a birch plywood core coated with a polyolefin plastic layer on both surfaces. This combination merges the structural strength of wood with the protection and durability of plastic, creating a panel that lasts up to four times longer than traditional phenolic-coated plywood.
Who it's for. STRATO-STOCK® is the reference choice for construction companies, formwork rental firms and formwork system manufacturers seeking a high-performance panel for concrete casting. It is compatible with all major framed formwork systems on the market and is used on job sites of every scale, from residential civil works to large infrastructure projects.
Why choose it. Compared to traditional phenolic film panels, STRATO-STOCK® offers tangible advantages: significantly higher abrasion resistance, nailing without chipping, fast cleaning with a pressure washer, resistance to cement chemical agents and a service life up to 4 times longer. Every panel is 100% ultrasonically inspected and laser-marked for full quality traceability.
CHARACTERISTICS
STRATO-STOCK® is a Birch plywood panel with plastic overlay.
- Abrasion resistance is considerably higher
- When nailed, the panel does not splinter
- Cleanable with high pressure water
- The panel’s life is at least four times longer than traditional phenolic plywood
The ILPA company was the first, in 1993, to patent and manufacture this new product for the concrete formwork industry. Subsequently, using specific “joint development programmes”, it patented and made further versions, such as the Xlife panel.
STRATO-STOCK® panel is compatible with all formwork systems available on the market.
Ultrasound control
The bonding of each single STRATO-STOCK® panel is regulated by ultrasonic machinery.
Laser screen printing
Afterwards, the panel is marked on the rear with a laser screen printing which guarantees traceability.
Traceability
The panel can be easily traced thanks to a label showing the barcode and lot number.
Application of STRATO-STOCK® panel in the frame.
Blue Overlay
Grey Overlay
Customization
MECHANICAL RESISTANCE
The impermeability of the product keeps the original mechanical characteristics of the wood stable over time, avoiding a rapid deterioration.
| Thickness EN 315 | mm | 9mm 8,59,5 | 12mm 11,312,5 | 15mm 14,215,3 | 18mm 17,118,2 | 21mm 19,821,1 |
| Bending Resistance EN 789 | MPa | 59 | 58 | 41 | 40 | 50 |
| Elastic-Modulus EN 789 | MPa | 4'100 | 4'500 | 5'600 | 6'000 | 7'300 |
| Plies | n° | 5+2 | 7+2 | 9+2 | 11+2 | 13+2 |
| Weight | kg/m2 | 7,5 | 9 | 11,5 | 13,5 | 15,5 |
HIGH ABRASION RESISTANCE
The images demonstrate the performance of both STRATO-STOCK® and film faced plywood subjected to both a scratch and taber stress test. STRATO-STOCK® panels do not fear heavy abuse.
Taber test
Scratch test
Technical Features of External Overlay
| Surface Material Water Absorption | < 3% | ISO R62 |
| Surface Hardness | SHORE D>70, GARDNER 5, JANKA 5,345 | Catas |
| Abrasion Resistance cs17 500 g 10.000 revolutions | -0,25 g -0,14 mm | CS17 Solvay Lab. |
| Taber Abrasion Resistance | 17.000 revolutions | UNI 9115 DIN 68861/2 |
| Surface Material Burning Resistance | 23 mm/min | DIN 75200 |
| Salty Fog Resistance | The panel doesn’t show any alterations | DIN 50021 ISO9227 |
NAILABILITY
The images show the nailability of the STRATO-STOCK® panel and the absence of splintering, which is common in phenolic film faced plywood.
Nail
Surface
EXCELLENT RESISTANCE TO CHEMICAL AGENTS
Thanks to its polyolefin-based surface, the panel resists cement alkalis and other corroding agents.
APPLICATIONS
RECYCLABLE
The STRATO-STOCK® panel consists of a birch plywood core overlaid with a polyolefin based plastic sheet. A study has shown that it is possible to re-use the STRATO-STOCK® panel at the end of its lifecycle. The panel, ground down with other materials, has been used as material to manufacture some products as shown below, injected with an open mold using Plastech technology (read more).
1. The panel
2. Manufacturing
3a. Example of a derivative product
3b. Example of a derivative product