Name: GRP PU Sandwich Panel
Brand: RaxPanel

GRP PU Sandwich Panel

The GRP PU Sandwich Panel combines glass fiber reinforced plastic (GRP) skins with a rigid polyurethane foam core, bonded using polyester or polyurethane resin adhesives. The GRP skins range from 0.7 to 5.0 mm thick with gel coatings available in matte, glossy, or embossed finishes and RAL colors. The closed-cell polyurethane core provides densities from 28 to 50 kg/m³, delivering thermal conductivity between 0.018 and 0.024 W/(m·K).

The panel operates across temperatures from -40°C to 120°C while resisting moisture, chemicals, and UV radiation. The closed-cell structure minimizes water absorption and maintains structural stability under mechanical stress. With core densities as low as 32 kg/m³, the lightweight design facilitates handling and installation while providing high stiffness and impact resistance. Service life typically exceeds 25 years with minimal maintenance requirements.

Applications include construction walls, roofs, and partitions; refrigerated transportation vehicles and trailers; cold storage facilities; modular buildings; and marine environments. CNC machining enables precise fabrication for complex designs and embedded components like aluminum profiles. Panels are manufactured up to 12 meters long and 3.2 meters wide using vacuum composite processes.

Customization options include thicknesses from 10mm to 200mm, various dimensions, surface finishes, colors, and reinforcement materials tailored to specific performance requirements.

Your Trusted GRP PU Sandwich Panel Supplier

As a leading manufacturer, supplier, and exporter of polyurethane foam (PU) sandwich panels, RaxPanel is dedicated to providing high-quality and innovative solutions for the transportation and logistics industry. With over 20 years of experience since our founding in 2002, we operate as a direct manufacturer based in Hebei, China, specializing in custom composite panel solutions. Our in-house R&D, design, and production capabilities allow us to deliver GRP PU Sandwich Panels that replace traditional panels with lighter, more durable, better thermal insulating, and more cost-effective performance.

The GRP PU Sandwich Panel combines a glass reinforced plastic (GRP) skin with a polyurethane foam core, compounded using high-performance adhesive for superior bonding strength. This structure results in:

Excellent thermal insulation
Reduced weight
Enhanced durability

These qualities make our panels ideal for refrigerated trucks, cold storage, and logistics applications. With a daily output of 1500+ m² and service to clients in 30+ countries, we ensure reliable, high-quality products tailored to specific requirements. Choose our GRP PU Sandwich Panel and experience the difference in performance and efficiency for your transportation needs.

Parameter	Value
Material Properties
Skin Material	Gelcoat GRP (Glass Fiber Reinforced Plastic) sheet
Skin Thickness	0.7 to 5.0 mm
Core Material	Rigid polyurethane foam (closed-cell structure)
Core Density	28 to 50 kg/m³
Adhesive	Unsaturated polyester or polyurethane resin
Surface Finish
Surface Treatment	Matte, glossy, or embossed
Surface Color	RAL series
Dimensions
Length	≤ 12 m
Width	≤ 3.2 m
Thickness	10 to 200 mm
Thermal Properties
Thermal Conductivity	0.018 to 0.024 W/(m·K)
Working Temperature	-40°C to 120°C
Mechanical Properties
Barcol Hardness	≥ 40
Flat Compressive Strength	≥ 0.18 MPa
Edgewise Compressive Strength	≥ 2.0 MPa
Tensile Strength	≥ 0.85 MPa
Additional Features
Internal Reinforcement Materials	Aluminum profiles, steel profiles, wood, fiberglass profiles, etc.

Related Products

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GRP PU Sandwich Panel Selection & Engineering Guide

Glass Reinforced Plastic (GRP / FRP) composite skins bonded to structural foam or honeycomb cores provide superior anti-corrosion barrier protection, high flexural strength, and easy maintenance for marine and transport enclosures.

💡 Pro Tip: Delamination Prevention Under Thermal Cycling
At RaxPanel, we utilize automated vacuum lamination with high-performance two-component polyurethane adhesives to ensure a bond strength that absorbs differential thermal expansion without micro-delamination.

1. How to Choose the Right Skin Alloy and Thickness

Outer skin selection governs mechanical impact resistance, corrosion barriers, and structural stiffness across different operating environments.

2. How Well Does the Core Insulate and Withstand Heavy Loads?

The core material acts as the web in an I-beam structure, handling shear stress and maintaining thermal R-value insulation:

Performance Metric	RaxPanel Engineering Standard	Application Advantage
Skin Spec	GRP / FRP Woven Roving Sheet (0.3mm – 2.0mm / 1.0-3.0mm)	High tensile and impact resistance against road debris
Thermal Conductivity	~ 0.028 – 0.038 W/m·K	Consistent thermal R-value energy savings
Adhesive Layer	Two-component PU / Epoxy Adhesive	Delamination-free performance under thermal freeze-thaw cycles

3. Which Surface Finish Will Protect Your Panels for 20+ Years?

Factory roller coating specifies long-term color stability, UV protection, and resistance against industrial pollutants or marine salt spray.

4. How Fire-Safe and Soundproof Are These Panels?

🛡️ Compliance & Acoustic Isolation:

Fire Safety: Formulations comply with EN 13501-1 Class B-s1,d0 and GB8624 Class B1 building fire safety standards.
Sound Damping: Composite core attenuates noise transmission by 24 dB to 30 dB relative to solid metal sheets.

5. Where Are GRP PU Sandwich Panels Most Commonly Installed?

🚢 Marine Cabin Bulkheads & Ship Interiors

Salt-spray immune composite bulkheads reducing vessel top-weight.

🚛 Transport Compartments & Chemical Housings

Chemical resistant and high-impact bodywork for aggressive environments.

6. How to Cut, Groove, and Seal Edges During Installation

Panels process easily on-site using standard CNC machinery, routers, or specialized edge profiles for airtight moisture sealing.

Frequently Asked Questions (FAQS)

1. What are the standard panel thicknesses, maximum lengths, and width options available for GRP PU Sandwich Panels?

Standard panel thicknesses range from 10mm up to 150mm. Standard widths include 1000mm, 1220mm, and 1500mm, with maximum single-sheet lengths up to 5800mm (5.8m) to fit ocean freight container shipping dimensions.

2. What are the primary engineering benefits of using GRP PU Sandwich Panels?

GRP PU Sandwich Panels deliver an exceptional stiffness-to-weight ratio, rot-proof moisture resistance, reliable thermal insulation, and dynamic fatigue endurance for high-stress applications.

3. How do these composite panels perform under high humidity and outdoor weathering?

The closed-cell core prevents water logging and condensation absorption, while pre-painted skins provide a 20+ year weatherability barrier against UV degradation.

4. What fire safety ratings and quality certifications do these composite panels meet?

Flame-retardant formulations meet EN 13501-1 Class B-s1,d0 and GB8624 Class B1 fire performance standards. Manufacturing quality is governed under ISO9001 management systems, with raw material performance verified under SGS and CE testing.

5. What surface coating options are available for exterior UV protection?

70% PVDF Fluorocarbon Coating PVDF coating provides a 20+ year exterior weatherability warranty against UV fading and acid rain. FEVE offers high gloss retention, while PE coating is cost-effective for indoor partitions.

6. Can these composite panels be CNC grooved, bent, or edge-sealed on-site?

Yes. Pre-painted skins can be V-grooved at 90° or 135° on the reverse side using standard CNC routers or hand tools, allowing manual edge folding into architectural cassettes without surface paint cracking.

7. How are large panel shipments packaged to prevent freight damage during ocean transit?

Panels are packed with protective PE film on both skins, separated by inter-sheet foam layers, and secured on heavy-duty export wooden pallets or CKD steel crates to prevent shipping damage during 20ft and 40ft container freight.