PU Foam Core for Sandwich Panels & Composite Parts

PU Foam Core

PU Foam Core combines polystyrene resin through extrusion processing to create rigid insulation and structural core materials with closed-cell architecture. Extruded Polystyrene (XPS) foam represents a prominent variant, delivering thermal performance, moisture resistance, and structural integrity for composite panel systems and insulation applications.

The material provides high compressive strength supporting significant loads while maintaining inherent moisture absorption resistance. This moisture barrier contributes to dimensional stability and preserves consistent thermal performance, as R-values remain less susceptible to degradation in damp conditions. The closed-cell structure exhibits low water vapor permeance and demonstrates resistance to corrosion and chemical exposure.

Technical specifications include compressive strengths measured per American Society for Testing and Materials (ASTM) D1621, thermal resistance values reaching R-5.0 per inch, and water absorption typically below 1% by volume. Flame spread ratings achieve Class A per ASTM E84, with effective operation across wide temperature ranges in various thicknesses and sheet dimensions.

PU Foam Core serves construction and transportation industries in continuous insulation for exterior walls, roof systems, and below-grade foundations. Applications extend to refrigerated truck bodies, cold storage facilities, and sandwich panel cores for recreational vehicles, marine construction, and architectural cladding. The material bonds with Fiberglass Reinforced Plastic (FRP), aluminum, plywood, and steel using polyurethane adhesives, while supporting various resin systems for vacuum infusion and hand lamination processes.

RaxPanel: Your Trusted PU Foam Core Supplier

At RaxPanel, we specialize in customizing high-performance PU foam core panels tailored to your industry needs. With over 20 years of experience as a direct manufacturer based in Hebei, China, we have built a reputation for delivering superior thermal insulation solutions that combine outstanding strength, adaptability, and thermal performance. Our in-house R&D and production capabilities allow us to maintain strict quality control, producing over 1500 m² daily to serve clients across 30+ countries.

We leverage advanced manufacturing techniques and sustainable practices to ensure every PU foam core panel offers:

Excellent moisture resistance
Superior compressive strength
Enhanced energy efficiency

Ideal for construction, cold storage, and transportation applications, our products reflect our commitment to innovation and reliability. Whether your project requires specific sizes, thicknesses, or performance attributes, RaxPanel offers expert consultation and support for custom options to meet your exact requirements.

Data Sheet
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Parameter Category	Parameter	Value	Test Standard
Thermal Properties	Thermal Resistance (R-value) per inch	R-5.0	ASTM C518
	Thermal Conductivity	0.024 – 0.034 W/m·K	–
Mechanical Properties	Compressive Strength	30 psi (min)	ASTM D1621
	Flexural Strength	55 psi (min)	ASTM C203
	Flexural Modulus	1,600 psi (min)	ASTM C203
	Tensile Strength	65 psi (min)	ASTM D1623
	Shear Strength	35 psi (min)	ASTM C273
	Shear Modulus	400 psi (min)	ASTM C273
Physical Properties	Density	30 – 50 kg/m³	–
	Water Absorption	≤ 1% by volume	ASTM C272
	Water Vapor Permeance (1″ thickness)	1.5 perms (max)	ASTM E96
	Closed Cell Rate	≥ 99%	–
	Coefficient of Linear Thermal Expansion	3.5 x 10^-5 in/in·°F	ASTM D696
	Dimensional Stability	≤ 2.0% change	ASTM D2126
Fire Performance	Flame Spread Rating	Class A (≤ 25)	ASTM E84 / UL 723
	Smoke Developed Index	≤ 450	ASTM E84 / UL 723
Environmental & Operational	Operating Temperature	-50°C to +75°C	–

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Frequently Asked Questions（FAQS）

What are the key advantages of using a PU foam core in composite panels?

PU foam cores provide excellent thermal insulation, high strength-to-weight ratio, and superior moisture resistance due to their closed-cell structure. They are compatible with various resin systems and improve production efficiency by saving time and material.

Is PU foam core resistant to moisture and water absorption?

Yes, PU foam core features a closed-cell structure that resists water absorption, preventing issues like mold, mildew, and structural degradation in humid or wet conditions.

What types of skin materials can be used with PU foam core panels?

PU foam core is compatible with a variety of skin materials, including fiberglass, aluminum, plywood, steel, and high-pressure laminates, allowing for flexibility in application and design.

How does PU foam core enhance energy efficiency in buildings?

PU foam core offers low thermal conductivity, effectively reducing heat transfer and helping maintain consistent indoor temperatures, which lowers energy consumption for heating and cooling.

Can PU foam core panels be customized for specific project requirements?

Yes, PU foam core panels can be customized in terms of width, thickness, length, skin type, and surface treatment to meet diverse structural and insulation needs.

What applications are PU foam core panels best suited for?

PU foam core panels are ideal for construction insulation, refrigerated transportation, mobile structures, industrial applications, and any scenario requiring lightweight, strong, and insulated composite materials.

Are PU foam core panels environmentally friendly?

Many PU foam core panels incorporate recyclable materials and are designed with sustainability in mind, offering low environmental impact and supporting green building standards.

How do you ensure long-term supply reliability and support for bulk customization in manufacturing applications?

As a direct manufacturer with over 20 years of experience and a daily output of 1500+ m², we prioritize supply chain stability and offer extensive customization options. Our in-house R&D team collaborates closely with clients to develop tailored solutions, ensuring consistent quality and meeting specific project requirements. We serve a global clientele in 30+ countries, demonstrating our commitment to reliable, large-scale production without installation services.

What kind of pricing structures and logistical support do you provide for distributors and wholesalers?

We offer competitive bulk pricing and flexible policies to help partners achieve high profit margins and efficient inventory turnover. Our manufacturing-focused model ensures product availability, and we support distributors with reliable logistics coordination for timely deliveries. While we do not provide installation, our emphasis is on supplying high-quality custom composite panels that meet market demand.

Can you assist with technical documentation and ensure on-time delivery for construction and fabrication projects?

Yes, we provide detailed technical data sheets, installation guides, and project support to facilitate easy and efficient use of our products. With our robust production capacity and experience serving diverse industries, we guarantee on-time delivery to keep projects on schedule. Our focus is on manufacturing durable, high-performance panels that align with your project timelines and quality standards.