Polyurethane Edge-Sealed Rock Wool Sandwich Panel

Simply put, it’s a triple-layer composite panel

Top & bottom layers: color-coated steel (0.4–0.8mm), optionally stainless steel or aluminum-magnesium-manganese, offering corrosion resistance and aesthetic flexibility.

Core layer: A-grade non-combustible rockwool (density 100–160kg/m³), made from natural stone, with fibers vertically aligned for superior compression strength.

Edge sealing: B1-grade flame-retardant polyurethane (PUR), about 50mm wide, sealing both ends.

This isn’t your standard rockwool panel. Without PU edges, ordinary panels absorb moisture, create thermal bridges, and lose insulation efficiency. PU sealing solves all that—tight, dry, and thermally broken.

5 Core Advantages That Make It a Must-Have

1. Fire Safety – A-Grade Non-Combustible

Rockwool core melts above 1000°C, emits no smoke or toxic gases. The PU edge is B1-grade—charring without dripping. Perfect for factories, warehouses, pharmaceutical plants, food workshops, and cold storage.

2. Energy Savings – Cut Bills by 30%+

Rockwool thermal conductivity: ≤0.043W/(m·K). PU edge: ≤0.024W/(m·K). The PU seal breaks the "thermal bridge" at panel edges. A 100mm panel delivers a thermal resistance of 4.0 (m²·K)/W, saving 30–40% on cooling/heating. In summer, cold storages and workshops stay 5–8°C cooler.

3. Waterproof & Moisture-Proof – No Swelling, No Rot

The closed-cell PU edge and full sealing prevent water ingress. Rockwool hydrophobicity exceeds 98%—no dampness, no mold, no decay. This eliminates the old problem of ordinary panels "collapsing when wet."

4. Structural Strength – Rigid, Stable, Durable

Compressive resistance ≥200kPa, strong bending capacity. Withstands -50°C to 120°C without deformation or cracking. The steel-rockwool-PU bonding stays intact during shipping and hoisting—walls remain flat and secure.

5. Fast Installation + Acoustic Insulation + Eco-Friendly

Hidden fastener joints, no on-site cutting, dry construction—shorter timelines, lower labor costs. Sound insulation ≥30dB—ideal for stadiums, airports, and noisy workshops. Zero formaldehyde, zero asbestos, 20–30 year lifespan, meeting green building standards.

Common Specifications (Customizable)

Thickness: 50 / 75 / 80 / 100 / 150 / 200mm (most used: 50, 75, 100)

Width: 600–1000mm (standard: 950, 1000mm)

Length: custom, typically ≤12m for transport

Steel gauge: 0.4 / 0.5 / 0.6 / 0.8mm (most used: 0.5, 0.6mm)

Where Are They Used?

Industrial: plants, warehouses, workshops, substations, food/pharma facilities

Public: gymnasiums, convention centers, airports, railway stations

Cold chain: freezers, cold storage, temperature-controlled rooms

Residential: steel-structured housing, villa exteriors, temporary shelters

How to Choose: PU-Sealed Rockwool vs. Ordinary Rockwool vs. Pure PU

Need A-grade fire + high insulation + waterproof? → PU-sealed rockwool (all-rounder)

Only chasing low price, temporary use? → Ordinary rockwool (but expect moisture and heat loss)

Need extreme insulation but lower fire rating? → Pure PU panel (B1-grade, pricier)

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