Name: PUR & PIR Insulated Wall and Roof Sandwich Panels Supplier
Brand: RaxPanel
Availability: MadeToOrder

PUR Sandwich Panel

PUR Sandwich Panels consist of pre-painted galvanized steel (PPGI) facings bonded to a polyurethane (PUR) foam core in a continuous three-layer structure. PUR is the earlier generation of rigid polyurethane foam; its upgraded variant, PIR (polyisocyanurate), offers improved fire performance because it chars rather than melting and dripping under direct flame. PUR remains a cost-effective choice where a moderate fire rating is acceptable.

The closed-cell PUR foam traps low-conductivity gas in over 90 percent of its cell volume, giving the panel strong thermal resistance relative to its thickness. Galvanized steel skins with factory-applied paint protect against weathering, moisture, and minor chemical exposure, while the lightweight composite design keeps structural loads low and simplifies on-site handling.

Surface finishes are available in a wide range of RAL colors and profiles, including flat or micro-ribbed faces to suit architectural requirements. Standard tongue-and-groove or overlapping edge profiles speed up modular installation.

Common applications include industrial roofing, warehouse wall cladding, cold-storage enclosures, and temperature-controlled transport bodies. Panels attach to steel or timber substructures with self-drilling screws and EPDM sealing washers.

Trusted PUR Sandwich Panel Manufacturer – Since 2002

We are a professional sandwich panel supplier and manufacturer based in Hebei, China. RaxPanel’s PUR Sandwich Panel is engineered to deliver an effective combination of strength, light weight, and thermal insulation, making it suitable for applications in construction, cold storage, and transportation. We specialize in custom composite panel solutions for clients worldwide.

Our PUR panels feature a robust three-layer structure with pre-painted galvanized steel (PPGI) facings and a polyurethane foam core, providing:

Excellent thermal insulation with conductivity as low as 0.03W/m·K
Lightweight properties, with density around 40kg/m³, reducing structural load
High strength and dimensional stability, ensuring smooth surfaces and durability
Customizable thickness, color, and finish options, including wood and stone grains

Produced with strict quality control and efficient manufacturing capacity, we meet precise customer requirements. As a direct manufacturer, we offer tailored panel solutions without installation services.

Parameter Category	Parameter	Value / Specification
Panel Dimensions	Panel Thickness	20mm, 30mm, 50mm, 75mm, 100mm or as required
	Panel Width	1000mm, 1220mm, 1500mm or as required (up to 1500mm)
	Panel Length	2440mm, 3200mm, 4880mm, 5800mm or as required (up to 5800mm)
Skin Layer	Skin Material	Pre-painted Galvanized Steel (PPGI)
	Skin Thickness	0.4mm – 0.8mm
	Surface Treatment	Pre-painted roller coating
	Coating Type	PE, SMP, PVDF
	Color Options	RAL solid colors, custom colors available
	Coating Film Thickness (PVDF)	25μm +/- 3μm
	Coating Film Thickness (PE)	15μm +/- 3μm
Core Material	Core Type	Polyurethane (PU) Foam
	Core Density	30 – 40 kg/m³
	Core Thickness	20mm – 100mm
	Thermal Conductivity	0.024 – 0.030 W/m·K
	Water Absorption	< 3%
Physical & Mechanical Properties	Flatness Tolerance	≤ 5mm diagonal deviation
	Panel Weight (Example: 20mm panel, 0.7mm skin)	~5.3 kg/m²
	Fabrication	Can be cut and processed with standard steel-working tools; self-drilling screws
Design Options	Shape	Flat panel, curved panel, custom shapes per drawing
	Panel Edge	Standard open edge, closed edge, or custom profiles per drawing

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PUR Sandwich Panel Engineering & Selection Guide

💡 Pro Tip: High-Density Polyurethane Foaming & Tongue-and-Groove Interlock
At RaxPanel, our PUR foam is injected at a density of 30-40 kg/m³ under high-pressure continuous foaming lines. Precision CNC-milled tongue-and-groove joint profiles incorporate factory-applied butyl sealant tape to ensure complete thermal bridge elimination and airtight vapor resistance.

1. How Does PUR Foam Compare in Thermal Insulation Efficiency?

Rigid polyurethane foam features over 95% closed-cell content. With a thermal conductivity coefficient of 0.024 – 0.030 W/m·K, a 50mm PUR panel achieves thermal insulation equivalent to 90mm of EPS or 100mm of mineral wool, reducing overall building wall thickness.

2. What Core Density and Mechanical Load Capacities Define PUR Panels?

The rigid foam core acts as an integrated structural web, supporting dynamic wind loads and foot traffic:

Technical Property	RaxPanel PUR Metric	Industrial Benefit
PUR Core Density	30 kg/m³ to 40 kg/m³	High structural compressive strength and core stability
Thermal Conductivity (λ)	0.024 W/m·K – 0.030 W/m·K	Ultra-low thermal transfer; minimizes refrigeration power consumption
Fire Rating Class	EN 13501-1 Class B2 / Class C-s2, d0	Flame retardant with self-extinguishing flame additives
Closed-Cell Content	≥ 95% Closed Cells	Zero moisture absorption, mold resistance, and long service life

3. Which Surface Steel Facings Protect Against UV and Atmospheric Weathering?

Pre-painted galvanized steel (PPGI) facings (0.4mm to 0.6mm) with PE or PVDF coatings resist UV fading, rain erosion, and mild chemical exposure for 20+ years.

4. How Tongue-and-Groove Interlock Eliminates Thermal Leakage

🔩 Seamless Joint Engineering:

Concealed Screw Fastening: Wall panel joints hide fixing screws inside the overlap recess, preventing rainwater rust points.
Airtight Gasket Seals: Factory-installed butyl sealant strips prevent air drafts and moisture condensation traps.

5. Where Are PUR Sandwich Panels Most Commonly Installed?

🏭 Industrial Warehouses & Factories

Energy-efficient external wall cladding and insulated roofing envelopes.

🥦 Food Storage & Agricultural Sheds

Temperature-controlled produce storage, poultry farm walls, and processing halls.

6. Fast Modular Erection and Alignment Practices

PUR panels assemble quickly on-site using vertical or horizontal alignment rails, reducing construction schedules by up to 50% compared to traditional masonry or concrete block walls.

Frequently Asked Questions (FAQS)

1. What is the standard core density for RaxPanel PUR sandwich panels?

Our standard PUR rigid foam core density is 30 kg/m³ to 40 kg/m³, providing optimal balance between compressive strength and thermal insulation.

2. What thermal conductivity (λ value) does PUR foam achieve?

PUR rigid foam achieves a thermal conductivity between 0.024 and 0.030 W/m·K, delivering strong thermal resistance per mm thickness.

3. What is the fire classification rating for PUR sandwich panels?

RaxPanel PUR panels meet EN 13501-1 Class B2 / Class C-s2, d0 flame retardant standards, formulated with self-extinguishing additives.

4. Can PUR sandwich panels absorb moisture or humidity?

No. Polyurethane foam has a closed-cell ratio exceeding 95%, making it water-resistant and immune to mold or rot.

5. What thickness options are available for PUR wall and roof panels?

Panel thicknesses range from 40mm, 50mm, 75mm, 100mm, up to 150mm depending on thermal R-value requirements.

6. How do tongue-and-groove joints prevent cold thermal bridges?

Interlocking tongue-and-groove joint profiles fit snugly with factory-installed butyl sealant, ensuring continuous insulation and zero air leakage.

7. What maximum single-panel length can be shipped in ocean containers?

Maximum single-panel length is 11.8 meters to fit standard 40ft High Cube (HC) ocean freight containers.