GRP Composite Panels with XPS Foam Core

GRP XPS Sandwich Panel

The GRP XPS Sandwich Panel combines Glass Fiber Reinforced Plastic (GRP) skins with an Extruded Polystyrene (XPS) foam core in a sandwich configuration, delivering thermal insulation and structural integrity for building and cladding applications. GRP skins range from 0.7 to 5.0 millimeters thick, with optional Continuous Fiber Reinforced Thermoplastic (CFRT) sheets for enhanced impact resistance. The closed-cell XPS core, typically 35 to 50 kilograms per cubic meter in density, provides consistent insulation. Embedded aluminum, timber, or fiberglass profiles augment strength, while gel-coat surface treatments in customizable RAL colors add anti-ultraviolet, flame-retardant, and antistatic properties.

The panel’s low thermal conductivity minimizes heat transfer while maintaining lightweight handling characteristics. Its sandwich construction delivers high strength and compression resistance, with waterproof, moisture-proof, and corrosion-resistant performance. Additional features include weather resistance, impact resistance, and anti-mildew properties, ensuring durability across varied climatic conditions.

Applications include wall, floor, and roof panels in recreational vehicles, motorhomes, and caravans. Transportation uses encompass refrigerated truck bodies and trailer panels for temperature control. Marine installations feature interior partitions on yachts and cruise ships, reducing hull weight and improving fuel efficiency. The panel also serves cold storage facilities, mobile homes, and industrial buildings.

Advanced production capabilities enable CNC (Computer Numerical Control) machining for precision cutting and customization up to 12 meters in length and 3.2 meters in width, with thicknesses between 10 and 120 millimeters. Glass Mat reinforced Thermoplastic (GMT) reinforcement layers enhance surface flatness and impact resistance.

GRP XPS Sandwich Panel Supplier for Superior Cold Chain Performance

As a leading manufacturer, supplier, and exporter of insulated composite panels, RaxPanel is dedicated to providing high-quality and innovative solutions for the transportation and logistics industry. With over 20 years of experience as a direct manufacturer based in Hebei, China, we specialize in custom composite panel solutions, serving clients in more than 30 countries. Our GRP XPS Sandwich Panel is specifically engineered for freezer cargo boxes, delivering superior thermal insulation, exceptional durability, and reliable performance under demanding conditions.

Our in-house R&D and advanced production capabilities allow us to offer fully customized solutions, including:

Excellent thermal insulation properties ideal for cold chain logistics
High strength and impact resistance for long service life
Lightweight construction combined with structural reliability
Custom sizes, thicknesses, and surface treatments

Available in thicknesses from 10–120 mm, widths up to 2.8m, and lengths up to 12m, our panels are produced at our facility with a daily output exceeding 1500 m². Choose RaxPanel’s GRP XPS Sandwich Panel for Freezer Cargo Box and experience the difference in performance and efficiency for your transportation requirements.

Parameter Category	Parameter	Value
General Specifications	Skin Material	Glass Reinforced Plastic (GRP)
	Core Material	Extruded Polystyrene (XPS) Foam
	Standard Thickness	10 mm – 120 mm
	Standard Width	2.8 m
	Standard Length	≤ 12 m
Core Properties	Core Density (Customizable)	Specified per application
	Cell Structure	Closed-cell
Performance Characteristics	Thermal Insulation	Yes
	Moisture Resistance	Yes
	Dimensional Stability	Yes
	Waterproof	Yes
	Impact Resistance	Yes
	Scratch Resistance	Yes
	Lightweight	Yes
Processing & Customization	Machining Compatibility	Standard woodworking tools, CNC
	Surface Finish Options	Customizable

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Frequently Asked Questions (FAQS)

What is a GRP XPS sandwich panel?

A GRP XPS sandwich panel is a composite material combining GRP (Glass Fiber Reinforced Plastic) sheets as the skin with XPS (Extruded Polystyrene) foam as the core, forming a sandwich structure. It offers excellent thermal insulation, waterproofing, lightweight handling, and durability, making it suitable for vehicles, ships, and buildings.

In which industries or applications are these panels commonly used?

These panels are widely used in refrigerated trucks and RVs for walls, floors, and roofs; in yachts and cruise ships for interior partitions; and in cold storage facilities, mobile homes, shelters, and industrial equipment to ensure temperature stability and reduce energy loss.

What makes these panels waterproof and environmentally resistant?

The XPS foam core has an extremely low water absorption rate due to its closed-cell structure, and the GRP surface features a non-hydrophilic gel coat. The panels resist UV radiation, corrosion, and various climate conditions, with optional flame retardant and antistatic treatments for enhanced outdoor durability.

How does the thermal insulation performance benefit users?

The XPS foam core provides exceptional insulation with low thermal conductivity of approximately 0.028 W/m·K, preventing heat transfer to keep interiors warm in cold weather and cool in hot weather. This ensures long-lasting thermal stability and energy efficiency in applications like cold storage and recreational vehicles.

What customization options are available?

We offer full customization: lengths up to 12m, widths up to 3.2m, and thicknesses from 10mm to 120mm. GRP or CFRT skin thickness ranges from 0.7mm to 5.0mm, with core density from 35 to 50 kg/m³. Surface colors match RAL standards with glossy or matte finishes, and embedded materials like aluminum profiles, steel pipes, wood, or fiberglass can be added for enhanced structural strength tailored to your project needs.

Do you provide technical documentation and samples?

Yes, we supply detailed technical data sheets covering thermal conductivity, compressive strength, and durability metrics. Samples are available upon request to help engineers, architects, and specifiers evaluate the material for their designs and verify compliance with project standards.

How do you ensure on-time delivery for bulk orders?

Our advanced automated production lines and in-house CNC machining achieve a daily output exceeding 1500 m², ensuring high efficiency and precision. We prioritize large orders with streamlined processes and manufacturing expertise to meet deadlines and maintain consistent supply.

What is your experience with international clients and global shipments?

With over 20 years as a direct manufacturer, we have successfully served clients in more than 30 countries. Our team manages international logistics efficiently with reliable shipping options and global supply chain expertise to ensure your orders arrive on time and in optimal condition.