Select domestic high-quality color-coated steel sheet and adopt cold-rolled steel sheet (electro-galvanized steel, hot-dip galvanized steel, or galvanized steel sheet) as the substrate,
which, after degreasing, phosphating, and chromate treatment, is continuously roll-coated with organic paint before baking. The process goes through a series of production management and quality control steps.
The commonly used coatings for color-coated steel sheets include PVDF, HDP, PE, and more.
We select color-coated steel sheets that meet the performance standards, which must pass stringent screening:
coating thickness, corrosion resistance (salt spray), resistance to fading & chalking, resistance to dust adhesion, pencil hardness & gloss, T-bend test & reverse testing related to impact performance,
and mechanical properties (yield strength, tensile strength, elongation), etc.
EN 14509 specifies requirements for factory-produced, self-supporting, double-skinned metal-faced thermal insulation sandwich panels (for use as a separating layer between roofs and roof coverings or between external walls and wall coverings). The core materials used for thermal insulation include rigid polyurethane, expanded polystyrene, extruded polystyrene foam, phenolic foam, foam glass, and mineral wool.
EN 14509 specifies a number of requirements for the mechanical strength of sandwich panels, including the determination and specification of the shear strength and shear modulus of the core material of the sandwich panel. The four-point bending test is used for this purpose. The shear modulus is calculated from the load-deflection curve using the ultimate load at which the test specimen breaks in shear.
When designing the bending fixture, it is essential to minimize wobbling or rebound, and the load plate in contact with the sample should be wide enough to prevent damage to the surface of the core material. The maximum test load depends on the thickness and material type of the core material but is usually less than 50 kN. For this test, we recommend using a universal testing machine to calculate the shear strength and shear modulus values automatically.
EN 14509:2013 Self-supporting double skin metal faced insulating panels-Factory made products-Specifications
EN 14509:2013 Self-supporting double skin metal faced insulating panels-Factory made products-Specifications
This European Standard specifies the requirements for factory-made self-supporting double-skinned metal-faced laminates for discontinuous laying in the following applications
a) roofs and roof claddings
b) external and internal wall claddings
c) walls (including partitions) and ceilings within the building envelope
EN 14509 covers insulation cores of rigid polyurethane, expanded polystyrene, extruded polystyrene foam, phenolic foam, cellular glass, and mineral wool
EAD 340287-00-0203 Reinforced high-density EPS structural panel system for building units
EAD 340287-00-0203 Reinforced high-density EPS structural panel system for building units
1. Shear strength and shear modulus
2. Creep coefficient
3. Compressive strength or compressive stress
4. Shear strength after long-term loading
5. Cross panel tensile strength Tensile strength
6. Bending moment capacity and wrinkling stress Bending resistance and wrinkling stress
7. Bending moment capacity and wrinkling stress over a central support
8. Thermal transmittance
9. Reduction of tensile strength with time as a consequence of aging (durability) Tensile strength as a result of aging
10. Resistance to point loads and access loads–ceiling panels and roofs
11. Reaction to fire
12. Dimensional tolerances for sandwich panels
AVCP System 1 certification system: EU Bulletin No. Preliminary type test, on-site audit, EU Bulletin No. issue certificate
AVCP System 3 certification system: EU Bulletin No. Preliminary type test, EU Bulletin No. issue certificate
AVCP System 4 certification system: preliminary type test, manufacturer's self-declaration
According to System 1, the higher the fire rating, the more likely EN 14509 CE certification is required.
Thermal conductivity, denoted by λ, is a material's ability to conduct heat. It is the amount of heat transferred through a 1-meter-thick material with a temperature difference of 1 degree (K or °C) across its two surfaces per square meter of area in one second. The unit of thermal conductivity is watts per meter per degree Kelvin (W/m·K), which can also be represented as W/(m·K) or W/m·K (where K can be replaced with °C).
Factors Affecting Thermal Conductivity:
Tseason Core Material Thermal Conductivity rate is below.The lower the thermal conductivity, the better the insulation.
| Material | Rock wool | Glass Fiber | PU | PIR |
| Core Average Density (kg/m³) | 120 | 64 | 42 | 48 |
| Core Thermal Conductivity (W/m·K) | 0.042 | 0.04 | 0.022 | 0.022 |
Rock wool sandwich panel is an inorganic material, with natural rock as the primary raw material, mixed with a small amount of blast furnace slag. Mineral fiber is made by high-temperature melting and centrifugal blowing, combined with a certain proportion of binder and additives through the pendulum pressing and cutting. It has good fireproof performance and is widely used in the construction field. The A1 grade rock wool sandwich panel is a non-combustible material, not easy to burn, will not release heat and toxic smoke, and can effectively cut off the flame spread in case of fire.
In general, the fire resistance rating of rock wool sandwich panels is influenced by variations in density (i.e., bulk density) and the rock wool boards' thickness.
Tseason's rock wool sandwich panels typically offer fire resistance ratings ranging from 1.5 to 3 hours. However, a 150mm thick sandwich panel can achieve a fire-resistance rating of up to 4 hours.
Yes, PU sandwich panels contribute to energy efficiency, reducing the overall environmental impact of a structure.
Absolutely, the versatility of PU sandwich panels allows for a wide range of customization options to suit specific design needs.
Sandwich panels play an important role in energy-efficient buildings because of their excellent thermal insulation properties, reduction of thermal bridging effects, lightweight and high strength, and rapid construction sustainability. By using sandwich panels, buildings' energy efficiency can be improved, energy consumption can be reduced, and a more comfortable and sustainable indoor environment can be created.
Here's an article that answers the reasons in detail
Polyurethane sandwich panel is a class B fireproof material with good fireproof and flame retardant properties, which meets the fire requirements. It has a thermal conductivity of 0.019-0.023w/m.k, excellent thermal insulation performance, and a normal service life of more than 30 years.
