The Complete Guide to Choosing Rock Wool Sandwich Panels for Factory Exterior Walls

When selecting rock wool sandwich panel system for factory exterior walls, it’s essential to balance fire resistance, thermal insulation, durability, cost efficiency, and ease of installation. This guide provides a comprehensive overview of key selection factors, performance indicators, and best practices — helping you make an informed, high-value decision.

Define Your Core Requirements

Fire Resistance:

Factory buildings typically require materials with excellent fire performance. Rock wool itself is a Class A non-combustible material, but it’s important to confirm that the composite panel structure as a whole meets the same high standard.

Thermal Insulation:

Select rock wool with a low thermal conductivity (λ ≤ 0.045 W/m·K) to ensure energy efficiency and stable indoor temperature, especially in regions with extreme climates.

Structural Strength:

The exterior wall must withstand wind pressure and mechanical impact. Panels with tensile strength ≥10 kPa and core density between 100–150 kg/m³ are ideal for long-term performance.

Key Technical Parameters

Rock Wool Core:

• Density: 120–150 kg/m³ for balanced strength and insulation.

• Water Repellency: Choose rock wool with a hydrophobic rate ≥98% to prevent performance degradation.

• Fiber Quality: High-grade rock wool has long, fine, evenly distributed fibers and minimal slag inclusion.

Surface Materials:

• Metal Panels (Color Steel, Aluminum): Offer strong durability and a modern aesthetic. For coastal or industrial areas, opt for aluminum-zinc coated or PVDF-coated panels for superior corrosion resistance.

• Non-Metal Panels (Calcium Silicate, Fiber Cement): Provide excellent fire resistance but tend to be heavier.

Composite Process:

• Bonding Strength: Ensure peel strength ≥0.1 MPa between core and metal sheets.

• Production Method: Panels made on a continuous production line ensure consistent quality and reduce risks of delamination.

Compliance and Certification

• National Standards: Check compliance with GB/T 25975-2010 (rock wool) and GB 8624-2012 (fire classification).

• International Standards: Look for ISO-certified products.

• Environmental Safety: Prefer materials with formaldehyde emission ≤0.1 mg/m³ and recyclable cores and coatings.

Adaptation to Specific Factory Needs

• Corrosion Resistance: For chemical or coastal plants, choose fluorocarbon-coated or stainless-steel-faced panels.

• Sound Insulation: Increase rock wool thickness (≥50 mm) or adopt double-layer structures for better acoustic performance.

• Weight Control: Use 50–80 mm panels for single-story buildings and 80–120 mm for multi-story or high-rise projects.

Supplier and Construction Coordination

Supplier Evaluation:

• Availability of third-party test reports (e.g., fire rating, wind pressure).

• Proven project experience in industrial or cleanroom construction.

Construction Coordination:

• Standard panel width: 950–1180 mm, customizable length.

• Check if the supplier provides sealing accessories, connectors, and joint design solutions for complete system compatibility.

Cost and Value Considerations

• Price Range: Metal-faced rock wool sandwich panels typically cost ¥80–150/m², while calcium silicate-faced panels are slightly less expensive.

• Maintenance: PVDF-coated panels offer the best weather resistance, extending service life and reducing long-term maintenance costs.

Recommended Selection Process

• Define your requirements: fire rating, insulation level, budget, and appearance.

• Request samples and test reports: verify water absorption, tensile strength, and peel strength.

• Compare options: evaluate at least three suppliers for performance and pricing.

• Confirm installation details: ensure panel compatibility with steel framing and fastening systems.

By following these steps, you can select a rock wool sandwich panel system that combines safety, insulation, durability, and economic efficiency — perfectly suited for modern industrial buildings.

Why Choose HEADSTREAM Rock Wool Panels

With over 30 years of industry expertise, HEADSTREAM has built a reputation as a leading manufacturer of high-performance sandwich panels in China. Our rock wool panels are produced on advanced continuous production lines, ensuring excellent bonding strength, flatness, and consistency.

We offer:

• Certified fire-resistant and thermal-insulating systems compliant with both Chinese and international standards.

• Customized solutions for factories, cleanrooms, cold storage, and modern architectural facades.

• Full technical support, from design optimization to installation guidance.

At HEADSTREAM, we are committed to providing durable, eco-friendly, and energy-efficient construction composite panels that help our clients create safer and more sustainable spaces.