What is a Polyurethane Edge-Sealed Rock Wool Sandwich Panel?

A polyurethane edge-sealed rock wool sandwich panel (PU edge-sealed rock wool panel for short) is a building cladding panel composed of upper and lower color steel plates + a middle Class A rock wool core + polyurethane (PUR) edge sealing at both ends.

It integrates fire resistance, heat insulation, waterproofing, sound insulation, and structural strength, emphasizing "safety + energy saving + durability".

Product Structure

Panel (Upper and Lower Layers): Color steel plate (0.4–0.8mm), stainless steel/aluminum-magnesium-manganese alloy also available, corrosion-resistant, anti-aging, aesthetically pleasing, and colorable.

Core Material (Middle): Class A non-combustible rock wool (made from natural rock), density 100–160kg/m³, fireproof, heat-insulating, and sound-absorbing; fibers are arranged perpendicular to the steel plates for stronger compressive strength.

Edge Sealing (Both Ends)

B1-grade flame-retardant polyurethane (PUR), approximately 50mm wide, blocks thermal bridges, provides waterproof sealing, and enhances overall strength.

Ordinary rock wool boards lack PU edge sealing,easily absorb water, have strong thermal bridges, and poor insulation;PU edge sealing perfectly solves these problems.

Five Core Advantages of PU-Sealed Rock Wool Panels

1. Fire Safety (Class A Non-combustible)

Rock wool core: Class A non-combustible, melting point >1000℃, does not burn when exposed to fire, no toxic smoke.

PU edge sealing: B1-grade flame retardant, carbonizes upon contact with fire without spreading, no dripping.

Suitable for: Factories, warehouses, pharmaceutical/food workshops, cold storage, and other places with high fire safety requirements.

2. Thermal Insulation and Energy Saving (Blocks thermal bridges, saves 30%+ on electricity)

Rock wool thermal conductivity: ≤0.043W/(m・K).

PU edge sealing thermal conductivity: ≤0.024W/(m・K) (superior).

Key: PU edge sealing cuts off thermal bridges at the edges of the board, achieving a thermal resistance of 4.0 (m²・K)/W for a 100mm thick board, saving 30%–40% more energy than ordinary rock wool boards; it can lower the temperature of cold storage/factory buildings by 5–8℃ in summer.

3. Waterproof and moisture-proof (non-absorbent, no dampness)

PU edge sealing closed-cell structure + fully enclosed design prevents rainwater penetration; rock wool has a water repellency rate >98%, ensuring it does not absorb water, mold, or rot even after long-term dryness.

Solve the common problems of ordinary rock wool boards: "collapse when wet, insulation failure, and short lifespan."

4. Robust structure (high strength, no deformation)

Compressive strength ≥200kPa, strong bending strength, no deformation or cracking under temperature differences of -50℃ to 120℃.

5. Installation Advantages

Steel plate + rock wool + PU integral bonding, durable during transportation/hoisting, resulting in a smooth and stable wall surface.

Installation: Concealed nail overlap, no on-site processing required, dry construction, short construction period, and labor savings.

Sound Insulation: Sound insulation ≥30dB, suitable for stadiums, airports, and noisy workshops.

Environmental Protection: Formaldehyde-free, asbestos-free, meets green building standards, lifespan 20–30 years.

Common Specifications (Custom)

Applications (Comprehensive Scenarios)

Industrial: Factories, warehouses, workshops, substations, food/pharmaceutical plants.

Public: Stadiums, convention centers, airports, train stations.

Cold Chain: Cold storage, refrigerated warehouses, temperature-controlled rooms.

Residential: Steel-structured houses, villa exterior walls, temporary housing.

The right panel depends on your needs. PU edge-sealed rockwool combines A-grade fire resistance, strong insulation, and waterproofing,ideal for permanent projects like steel villas. Ordinary rockwool is cheaper but poor in moisture resistance and thermal performance. Pure PU offers great insulation with B1 fire rating, yet costs more and provides lower fire safety. For most builders, PU edge-sealed rockwool strikes the best balance of performance, safety, and value.

For more information needed or any inquiry,please feel free to contact Yumisteel team.