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Product Introduction

Our PU, PIR, polyurethane, and polystyrene sandwich panels for steel structures and modular homes are designed to solve a common challenge in pre engineered and modular construction: balancing thermal insulation, weight, and installation speed. Traditional wall and roof systems often require multiple layers (insulation, vapor barrier, cladding), which adds labor, cost, and weight. By bonding a rigid foam core (PU, PIR, or EPS) between two steel facings, these panels provide one step installation, excellent thermal efficiency (λ as low as 0.022 W/m·K), and a lightweight yet strong structure ,perfect for fast track projects.

Applications include steel frame buildings, modular homes, prefabricated houses, container houses, portable cabins, construction site offices, and any project where quick assembly, energy savings, and reliable insulation are essential.

Product Specification

Comparison Factor	Rockwool Sandwich Panels	PIR Sandwich Panels
Core Material	Dense rock wool fibers made from natural rock	Rigid polyisocyanurate foam
Fire Performance	Non-combustible (Class A) . Excellent fire barrier; does not melt or release toxic fumes.	Combustible (Class B) . Burns and chars but offers better fire resistance than standard PU foam.
Thermal Insulation	Good sound absorption and stable insulation, but requires greater thickness for extreme temperatures.	Superior thermal efficiency. Lower thermal conductivity means better energy savings with thinner panels.
Moisture Resistance	Highly absorbent if damaged or poorly sealed; can lose insulating properties when wet.	Excellent moisture resistance. High closed-cell rate prevents water absorption.
Weight & Handling	Heavy and dense. Harder to cut and install; generates dust during cutting.	Lightweight and rigid. Easy to cut, lift, and install; cleaner job site.
Cost Efficiency	Generally more expensive due to material weight and complexity.	More cost-effective. Lower material cost and faster installation reduce total project expenses.

Rockwool sandwich panels VS PIR sandwich panels

Here is a detailed comparison table from a buyer's perspective to help you choose between Rockwool and PIR sandwich panels:

Specification	Details
Panel Thickness	50mm, 75mm, 100mm, 120mm, 150mm, 200mm
Panel Width	1000mm (standard), 950mm (optional)
Panel Length	2000mm – 12000mm (customizable)
Steel Facings	Pre-painted galvanized steel / color coated steel
Steel Thickness	0.4mm – 0.8mm (both sides)
Core Material	Polyurethane (PU) rigid foam
PU Density	38 – 45 kg/m³
Thermal Conductivity (λ)	≤ 0.022 W/(m·K)
Sound Reduction Index (Rw)	24 – 32 dB (depending on thickness)
Compressive Strength	≥ 150 kPa (at 10% deformation)
Fire Rating	B2 – B3 (self-extinguishing) / optional flame retardant grade
Joint System	Steel tongue-and-groove with hidden fastener
Water Absorption	≤ 3% (by volume)
Operating Temperature	-50°C to +80°C
Applications	Cold rooms, clean rooms, refrigerated warehouses, food processing plants, pharmaceutical facilities

Service

Comprehensive Construction Solutions for Modern Infrastructure


Precision Material Fabrication	Custom Structural Design	Project Management & Installation	Technical Consultation & Support

Yumisteel is a comprehensive construction solution provider dedicated to driving innovation in the construction industry. We offer clients intelligent, durable, and cost-effective solutions, covering every stage from initial design to final installation.

We are not just construction material suppliers; we are your strategic engineering partners who solve complex structural challenges. We integrate advanced manufacturing technology, rigorous quality control, and expert project coordination to deliver robust, reliable, and sustainable steel structures.

FAQ
1. Are you a factory?
Yes, we have our own factory with multiple production lines for steel structures, pipe trusses, grid structures, light steel and heavy steel products. And our company also has more than 30 senior design and technical talents, including senior engineers, registered constructor, and engineers.
2.How can you control the quality?
Our strict quality control measures are in place throughout the entire process from material procurement, processing and manufacturing to product transportation. Advanced equipment is used in the processing process, and strict production operation plan management is implemented for the production and manufacturing process to ensure the schedule and quality of projects.
3.How can you guarantee the price you offering is the best one?
We are professional steel structure supplier and can provide the best design for you which will save you money with the good quality.
4.Can you offer a device service?
Yes, we have a excellent design team. We can design full solution drawings as per your requirements.
5. Do you offer installation service?
Yes, we can provide both online or on-site installation guide or send an professional installation team to your place.

hot tags : PU sandwich panels PIR sandwich panels Polyurethane sandwich panels Polystyrene sandwich panels EPS sandwich panels Steel structure sandwich panels