GRP PET Sandwich Panel

The GRP PET Sandwich Panel is consisted of fiberglass reinforced plastic (GRP) skins bonded to a polyethylene terephthalate (PET) foam core. This structure combines the high strength and durability of the GRP surface layers with the lightweight and insulating properties of the rigid PET foam core. The panels are manufactured using high-pressure processes to ensure a stable and permanent bond between the layers.

These panels are utilized in applications requiring a combination of thermal insulation, structural integrity, and resistance to environmental factors. Common uses include wall and roof systems in construction, interior and exterior panels for recreational vehicles (RVs), commercial trailers, and marine applications. The material can be processed using standard woodworking tools and CNC machining for custom shapes and sizes, with a typical maximum panel length of 12 meters and width of 3.2 meters.

Key Characteristics:

  • High strength-to-weight ratio due to the composite sandwich structure
  • Effective thermal insulation with low thermal conductivity
  • Resistance to moisture, corrosion, and a wide range of chemicals
  • Long service life with stability across a temperature range from -50°C to +80°C
  • Customizable dimensions, surface finishes, and colors
  • Ease of installation and processing with standard tools

Your Trusted Supplier for High-Performance GRP PET Sandwich Panels

RaxPanel is a professional high-end fiberglass sandwich panel manufacturer in China, specializing in custom composite panel solutions. With over 20 years of experience since our founding in 2002, we have built a strong reputation for innovation and quality, serving clients across more than 30 countries. Our in-house R&D, design, and production capabilities ensure that every GRP PET Sandwich Panel we produce meets the highest standards of performance and reliability.

Our GRP PET Sandwich Panel combines a fiberglass reinforced plastic skin with a PET foam core, creating a lightweight yet durable composite material ideal for applications such as refrigerated truck bodies, cold rooms, wall partitions, and container houses. The sandwich structure offers:

  • Excellent thermal insulation, reducing energy loss and maintaining stable temperatures
  • High strength and impact resistance, thanks to the composite design and quality materials
  • Waterproof and corrosion-resistant properties, ensuring long service life even in demanding environments
  • Lightweight composition, which helps reduce overall weight and improve fuel efficiency in mobile applications

Produced at our Hebei-based facility with a daily output of over 1500 m², our panels are manufactured using advanced processes and high-quality raw materials. We offer customized solutions in terms of size, thickness, surface finish, and performance treatments to meet specific project requirements.

To learn more about product applications, please consult us. We provide reliable customized solutions for your project.

Parameter Category Parameter Value
General Specifications Core Material Polyethylene Terephthalate (PET) Foam
Skin Material Fiberglass Reinforced Plastic (GRP)
Maximum Length 12 m
Maximum Width 3.2 m
Total Thickness Range 10 – 120 mm
Core Material Core Density Range 50 – 300 kg/m³
Thermal Conductivity 0.02 – 0.038 W/m·K
Closed Cell Rate ≥ 99%
Water Absorption ≤ 1%
Operating Temperature -50°C to +80°C
Skin Material Surface Treatment Gel-coat (RAL colors)
Mechanical Properties Flexural Strength 36.966 MPa
Compressive Strength 0.1 – 1 MPa
Thermal Properties Service Life Up to 50 years




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    GRP PET 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 PET 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 PET 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 PET Sandwich Panels?
    GRP PET 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.


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