Sandwich panels are a fundamental component in modern prefabricated construction. They are widely used for insulation, structural support, and enhancing the energy efficiency of buildings. Among the various types available, Rockwool and PU (Polyurethane) sandwich panels are two of the most popular choices, each offering unique benefits depending on the application.

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In this blog, we present a detailed comparison between Rockwool panels and PU sandwich panels across five key factors to help you make an informed decision for your construction needs.

1. Fire Resistance

When it comes to fire safety, Rockwool sandwich panels outperform PU panels. Here’s how they compare:

• Rockwool panels are rated A-level fire-resistant, meaning they are made from non-combustible materials and can withstand high temperatures without catching fire.
• PU sandwich panels are classified as B1-level, indicating they are made from flame-retardant materials. While they don’t spread fire easily, they are not entirely fireproof and rely on the removal of the fire source to stop burning.

Conclusion: For environments where fire resistance is a top priority, Rockwool panels are the safer choice.

2. Thermal Insulation Properties

• PU panels have superior thermal insulation with a thermal conductivity of 0.025–0.028 W/m·K, making them ideal for temperature-sensitive environments.
• Rockwool panels have a thermal conductivity of 0.041–0.045 W/m·K, offering moderate insulation compared to PU.

Conclusion: If energy efficiency and heat insulation are critical, PU sandwich panels are the better option.

3. Waterproofing Ability

• PU sandwich panels provide excellent waterproofing capabilities, making them highly resistant to moisture and water damage.
• Rockwool panels are less water-resistant and may require additional waterproofing treatments for certain applications.

Conclusion: For areas exposed to moisture, such as cold storage units or external walls, PU panels are more reliable.

4. Density and Weight

• Rockwool panels have a higher density, approximately 120 kg/m³, offering better sound absorption and structural rigidity in certain applications.
• PU panels are lighter, with a typical density of around 40 kg/m³, which contributes to ease of installation and reduced structural load.

Conclusion: Choose Rockwool for soundproofing and PU for lightweight and thermal performance.

5. Sound Absorption

• Rockwool panels are known for their excellent sound insulation. Their fibrous composition absorbs a wide range of sound frequencies, making them ideal for environments requiring noise control, such as factories or auditoriums.
• PU panels offer limited sound absorption capabilities.

Conclusion: For projects that require noise reduction, Rockwool panels are the preferred choice.

Applications of Rockwool and PU Sandwich Panels

Rockwool Panels – Best suited for:

• Steel structure plants
• Air clean room ceilings
• Roofing and wall cladding
• Projects requiring fire resistance and soundproofing

PU Sandwich Panels – Best suited for:

• Clean rooms
• Cold storage facilities
• Warehouses and commercial buildings
• Projects demanding thermal insulation and waterproofing

Which Panel Should You Choose?

The choice between Rockwool and PU sandwich panels depends on your project’s specific requirements—whether you prioritize fire resistance, soundproofing, thermal efficiency, or waterproofing.

At EPACK Prefab, we manufacture high-quality Rockwool and PU (Polyurethane Foam) sandwich panels, fully customized to meet your building specifications. As a trusted name in the prefabrication industry since , we are committed to delivering energy-efficient, cost-effective, and durable solutions.

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As a thermal insulation material, polyurethane sandwich panel is highly recognized in the market. Why can we capture the hearts of many bosses? Let's find out in detail.

1:Thermal insulation and energy saving, cost-effective.

As a thermal insulation material, polyurethane sandwich panel has a thermal insulation effect twice that of EPS and three or four times that of other thermal insulation materials.

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2:Fire retardant

Polyurethane sandwich panel has self extinguishing property, and flame retardant is added in the production process, so that it can more effectively resist the attack of fire. Even if the instantaneous temperature reaches 250 ℃, it can be calmly dealt with.

3:Sound insulation and air tightness

The air tightness of polyurethane sandwich panel is very good, which can effectively absorb sound. In particular, the office buildings in downtown areas are bustling outside, and excellent privacy space must be effectively guaranteed.

4:Waterproof and moisture-proof

For large breeding bases, there is a very high requirement for humidity. Therefore, it is very important to be moisture-proof and waterproof.

5:Prevent rusting and corrosion

The polyurethane sandwich panel has a large span and is waterproof and moisture-proof, so it is not easy to rust. And its service life shall be at least 20~50 years. It shall be installed once and used for life. The most important thing is that they do not need additional maintenance and care and are always in the best condition.

6:The appearance is beautiful and generous, and the layout is flexible to reduce loss

The appearance of polyurethane sandwich panel is neat and uniform, and it can be cut at the same time. For irregular walls, it has flexibility, reduces loss and maximizes value.

7:Fast construction

The production of polyurethane sandwich panel is highly efficient, reducing the waiting period for construction. It saves time for the enterprise, which is equivalent to increasing the income of the enterprise in disguised form.

To sum up, the seven advantages of polyurethane sandwich panel really make many construction teams like it deeply. BRD also hopes that excellent thermal insulation materials such as polyurethane composite panels can become better and better, and be applied and relied on by more industries and projects.

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