PU Foam Edge Sealing Rock Wool Sandwich Panel

Polyurethane (PU/PIR) edge-sealed rock wool sandwich panels are the most favored exterior building envelope material for industrial and commercial buildings, high-efficiency factories, and fire-compliant projects worldwide, representing an excellent fusion of modern building materials science. Traditional rock wool sandwich panels are prone to moisture absorption and air leakage, leading to rock wool detachment. Ordinary polyurethane boards also fail to meet the stringent Class A non-combustible fire resistance standard. PU foam edge sealing rock wool sandwich panel by combining these two aspects, perfectly balance the absolute fire resistance of Class A and the high airtightness and thermal insulation of polyurethane, making them the golden choice for cross-border builders, general contractors, and multinational industrial investors seeking to secure their assets.

Product Structure

PU foam edge sealing rock wool sandwich panels are integrally formed using a fully automated continuous hot-pressing production line. The structure consists of three layers:

Double-sided Outer Shell: High-strength, highly corrosion-resistant hot-dip galvanized (or zinc-aluminized) color-coated steel sheets with a high-end UV-resistant coating (such as PVDF/HDP), easily resisting sea breezes, salt spray, and extreme sun exposure at different latitudes worldwide.

Core Material (Fireproof Body): High-density, hydrophobic, longitudinally aligned high-quality non-combustible rock wool. The rock wool fibers are perpendicular to the color steel sheet surface, giving the panel excellent shear and tensile strength.

Side Locking (Edge Sealing Core): High-pressure continuous foaming sealing of two-component rigid polyurethane (PU/PIR) foam is used on both sides of the tongue and groove joint (interlocking area).

Structural of PU Foam Edge Sealing Rock Wool Sandwich Panel

Technical Parameter Table (International Standard Specifications)

Parameter / Item	Standard Specification & Data	Testing / Certification Standards
Effective Width	Wall panel: 950mm / 1000mm / 1150mm Roof panel: 950mm / 1000mm (usually 3 or 4 crests)	Perfectly adapted to 40HQ container loading modules
Thickness	50mm / 75mm / 100mm / 150mm / 200mm	Customizable based on extreme cold/heat climate zones
Steel Facing Thickness	0.4mm – 0.8mm (Commonly 0.5mm / 0.6mm)	General material grade: Q235/Q355 grade color-coated sheets
Rock Wool Density	100 kg/m³ – 140 kg/m³ (Commonly 120 kg/m³)	Ensures excellent compressive and shear strength
Thermal Conductivity	≤ 0.043 W/(m·K)  (Refers only to the rock wool core)	Provides an excellent thermal insulation barrier
Hydrophobic Rate	≥ 98%	Combined with polyurethane side sealing, it completely blocks moisture penetration
Fire Rating	Class A1 (Non-combustible, non-melting, zero toxic smoke, zero droplets)	EN 13501-1 / ASTM E84 / ASTM E136
Fire Resistance Limit	60 – 240 minutes (Depending on panel thickness; 100mm thickness can reach up to 4 hours)	Meets the inspection and approval requirements of major fire departments worldwide
Air Tightness	≤ 0.1 m³/(m·h·kPa) (Tight tongue-and-groove jointing)	Easily passes air tightness pressure tests (such as the Blower Door Test) in Europe and North America
Eco-friendliness	CFC/HCFC-free foaming, comes with Environmental Product Declaration (EPD)	Perfectly aligned with global Nearly Zero-Energy Building (NZEB) standards

Core Features and Advantages of the Product

1. Fire Rating

The core rock wool has a melting point exceeding 1000℃, with a fire resistance limit of 1-4 hours. The entire board system perfectly complies with the highest global public safety and fire protection compliance standards, including European EN 13501-1 (Class A) and North American ASTM E84, making it a powerful tool for passing stringent fire safety approvals.

2. Edge Sealing Technology

Traditional rock wool easily absorbs moisture from the air, leading to increased weight, collapse, and loss of insulation. Polyurethane edge-sealed rigid foam boasts an extremely high closed-cell rate of ≥95%, tightly vacuum-packing the rock wool with virtually zero water absorption, more than doubling the board’s lifespan. Simultaneously, utilizing polyurethane’s strong elasticity and molding precision, the tongue-and-groove joints are perfectly sealed, eliminating heat loss.

3. Thermal Resistance and Mechanical Properties

Polyurethane edge sealing significantly reduces the cold bridge effect at the tongue and groove joints, resulting in a significant reduction in the overall heat transfer coefficient (U-value). This can directly reduce summer air conditioning operating costs or winter heating costs (OPEX) for factory owners by 35% – 45%. Because the rock wool fiber and polyurethane edge sealing form a rigid whole, its bending and wind pressure resistance is excellent, easily withstanding extreme hurricane loads.

PU Edge Sealing Rock Wool Wall Panel Type

PU Edge Sealing Rock Wool Roof Panel Type

Global Application Scenarios

Due to its versatile physical properties, PU foam edge sealing rock wool sandwich panel is widely used in building applications with dual rigid requirements for safety and energy conservation.

Modern industrial plants and steel structure workshops: Especially in high-risk, multi-heat-source heavy industrial plants such as smelting, chemical, and automobile manufacturing plants.

Global integrated supermarkets and large logistics centers: Such as the construction of large-area exterior walls and roofs for multinational logistics centers and commercial complexes.

High-cleanliness workshops: Such as interior partitions and ceilings in precision electronics, biopharmaceutical, and food processing industries with strict requirements for cleanliness, waterproofing, and mildew resistance.

100% Factory High-Precision Prefabrication

For overseas cross-border projects, PU foam edge sealing rock wool sandwich panel is an ideal one-stop modular component.

• Modular Dry Construction: All boards are precisely cut to length, edge-sealed, and punched on a continuous production line in a large-scale digital factory. After unpacking at the destination port, on-site workers only need to perform rigid bolt tightening and assembly, requiring 100% no cutting on-site.
• Half the construction time: This sheet material is not limited by rainy seasons or extremely cold weather. On-site assembly speed is 3-4 times faster than traditional bulk material assembly, helping global investors lock in long-term, high-value commercial and industrial assets with extremely fast business turnover in the face of volatile market environments.