
GRP plywood sandwich panels are a sandwich structure composite material with plywood as the core material and GRP sheet as the skin. Bonding a layer of GRP on the surface of the plywood can greatly improve the physical properties of the plywood and make up for its inherent shortcomings.
Why Choose GRP as The Surface Material of Plywood?
Plywood effectively utilizes timber resources and reduces the exploitation of forest resources. It is a composite board formed by multi-layer thin wood boards bonded together by glue and subjected to high pressure. The wood grain direction of each layer of veneer is generally arranged crosswise, which improves the strength, stability and durability of the plywood. But pure plywood has one of its biggest drawbacks: it’s not waterproof. Plywood that has been exposed to the elements for a long time is particularly prone to rot, which reduces its service life. GRP sheet can help plywood to insulate water, steam and chemical liquids, while also increasing its compressive strength.
Structure Schematic
- Surface Layer: Flat GRP sheet endows the panel with waterproof performance and aesthetic effect, and at the same time increases the strength and durability of the panel.
- Core Material: The selected plywood has clear layers, tight bonding, stable performance, and is not easy to deform.
Basic Specifications
Skin material | GRP sheet. (Thermosetting Matrix) CFRT (Continuous fiber reinforced thermoplastic) sheet. |
Core material | Plywood (Poplar, birch, oak, pine, eucalyptus, beech, etc.). |
Length | ≤12m. |
Width | ≤3.2m. |
Thickness | 6.0~50mm. |
Types of GRP Sheets
We offer two different systems of GRP sheets as skin material for sandwich panels: Glass Fiber Reinforced Plastic with Thermosetting Matrix – GRP Sheets and continuous Glass Fiber Reinforced Thermoplastic – CFRT Sheets.
Our Customized Services
- Custom Size and Thickness: We provide CNC machining services.
- Custom Plywood Log Material: You can choose poplar, birch, oak, pine, eucalyptus, beech, and other wood.
- Custom types of Fiberglass Sheets: We offer thermoset GRP and thermoplastic GRP (CFRT) sheets.


Applications of GRP Plywood Sandwich Panels
- Trucks: Wall panels and floors of dry goods trucks and refrigerated trucks.
- RVs: Partitions, furniture, cabinets, bed panels, and floors inside the property.
- Yachts: Decks of ships, and partitions of rooms on ships.
- Buildings: Exterior walls, roofs, partitions, ceilings, etc. of buildings.

