In order to make the RV composite panel stronger, the frame structure is usually pre-embedded inside it, so how to choose the frame material of the RV composite panel is very important. Commonly used frame pre-embedded materials include aluminum tubes, stainless steel tubes, steel tubes, wooden bars, etc. These materials have their own advantages and disadvantages. For example, metal pipes are stronger, but welding them is more troublesome, and the frame part is more prone to heat transfer problems; wood is lighter but it is more perishable and easily deformed by moisture, which shortens the service life of the composite panel.
Is there any better material to replace them? Of course, TOPOLO-RV has creatively developed a new type of PVC square bar frame. It combines the advantages of various materials and is a cost-effective pre-embedded material.
What Are Its Characteristics?
- Lightweight: The density of PVC foam material is lower than that of most woods, which greatly reduces the weight of RV composite panels.
- Good rigidity: The flexural strength of PVC foam far exceeds that of aluminum pipes, steel pipes and wood. This makes the composite panel more resilient.
- Thermal insulation: The thermal conductivity of PVC foam is very low, which can effectively reduce the occurrence of the thermal bridge effect.
- Corrosion-resistant: PVC material does not react chemically with most acid-base materials, and is a kind of pre-embedded material with stable performance.
- Waterproof and moistureproof: PVC foam is not hydrophilic, will not rot, expand and deform. It has a long service life, usually more than 10 years.
- Nail holding power: It can fix nails and screws as firmly as wood.
Performance of PVC Square Bars
| Item | Unit | Value | Standard |
| Linear expansion coefficient | ℃-1 | 5.55*10-5 | GB/T 1036-2008 |
| Water absorption | % | 0.86 | GB/T 1034-2008 |
| Thermal conductivity | W/(m·K) | 0.132 | GB/T 10297-1998 |
| Tensile strength (4mm skin) | MPa | 20.8 | GB/T 1040.2-2006 |
| Tensile strain at break (4mm skin) | % | 9 | GB/T 1040.2-2006 |
| Flexural strength (4mm skin) | MPa | 33.6 | GB/T 9341-2008 |
| Charpy unnotched impact strength (4mm skin) | kJ/m2 | 13.6(C) | GB/T 1043.1-2008 |
| Nail holding force | N | 1226 | LY-T 1613-2004 |
Application of PVC Square Bars on Caravans
