EPS Sandwich Panel

EPS Sandwich Panels combine an Expanded Polystyrene (EPS) core with metal facings for temperature-controlled construction applications. The EPS core forms through inflating micro-granular polystyrene with water vapor and pentane gas, creating tightly bonded granules with trapped air in closed-cell pores. Metal cladding options include pre-painted galvanized steel, stainless steel, or aluminum in RAL colors.

Available thicknesses range from 50mm to 200mm with standard 1120mm width and customizable lengths. The EPS core delivers thermal conductivity of approximately 0.038 W/mK, providing effective insulation for cold storage environments. The closed-cell structure resists moisture ingress and prevents fungal growth while maintaining lightweight handling characteristics.

Interlocking connection systems create airtight seals between panels through tongue-and-groove profiles or cam-lock mechanisms. Installation accommodates vertical or horizontal orientation with modular assembly that reduces labor time. Panels connect by fitting together and securing with fastening systems like Allen key-operated cam locks.

Primary applications include walls, ceilings, and partitions in cold rooms, freezers, food processing facilities, and pharmaceutical storage. The panels support temperatures from refrigerated to freezing conditions while meeting hygiene standards for food safety. Surface materials resist oils, chemicals, and solvents, inhibiting bacterial growth in sensitive environments.

Global EPS Sandwich Panel Wholesaler

As the industry leading insulated panel manufacturer, RaxPanel provides EPS Sandwich Panels built with high-quality insulation materials to ensure optimal thermal efficiency, durability, and long-lasting performance.

Our panels feature robust construction with:

  • Corrosion-resistant steel sheets
  • Expanded polystyrene core for superior thermal performance
  • Interlocking tongue-and-groove systems that act as a thermal break to reduce energy consumption

With over 20 years of experience and in-house R&D based in Hebei, China, we leverage our expertise to deliver custom composite panel solutions that meet international standards including CE, FM, and FDA, backed by warranties from 1 to 5 years.

Serving clients in more than 30 countries, we produce over 1500 m² daily, ensuring reliable and personalized support for your specific project needs.

Get High-Quality EPS Sandwich Panels From RaxPanel Today!

Parameter Value
Core Material Expanded Polystyrene (EPS)
Standard Thickness 50mm, 75mm, 100mm, 120mm, 150mm, 200mm
Standard Panel Width 1120mm
Thermal Conductivity (Lambda λ-value) 0.038 W/mK
Panel Density 42 kg/m³
Surface Material Options Pre-painted galvanized steel, Stainless steel, Aluminum
Color Options According to RAL chart
Compressive Strength Supports structural applications and hanging equipment
Fire Resistance Combustible, with a common fire resistance classification
Joint System Tongue-and-groove interlocking connection system
Installation Cam-lock or plug-in mechanisms for modular assembly
Application Temperature Range Refrigerated conditions above freezing to freezer applications
Key Applications Cold rooms, freezer rooms, food processing plants, distribution warehouses, pharmaceutical storage, horticulture rooms




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    Building Sandwich Panel Specification & Engineering Guide

    Building sandwich panels provide high-performance thermal insulation, weatherproofing, and structural strength for commercial warehouses, residential enclosures, agricultural facilities, and modular shelters. Utilizing premium metal skins such as 55% Aluzinc / Galvalume or high-tensile pre-painted steel bonded to EPS, PUR, PIR, or Rockwool cores, these panels deliver rapid construction turnaround and long-term energy savings.

    💡 Pro Tip: 55% Aluzinc Corrosion Resistance & Heat Reflectivity
    At RaxPanel, our Aluzinc (AZ150) coated steel facings feature a 55% Aluminum – 43.4% Zinc – 1.6% Silicon alloy matrix. This provides 2x to 6x greater corrosion protection than standard galvanized steel while reflecting over 65% of solar heat radiation to reduce summer cooling loads.

    1. How Does Aluzinc Core Coating Outperform Standard Galvanized Steel?

    Standard GI steel rusts at cut edges and scratches within a few years. Aluzinc’s microscopic aluminum barrier layer combined with zinc galvanic protection prevents edge red rust, delivering a 25-30 year maintenance-free lifespan even in coastal and humid agricultural environments.

    2. Technical Performance Matrix Across Core Options

    Compare mechanical load capacities, fire ratings, and thermal conductivity across RaxPanel core formulations:

    Core Formulation RaxPanel Technical Metric Target Engineering Application
    55% Aluzinc Facings (AZ150) Coating Weight 150 g/m² / Solar Reflectance > 65% Extreme weather roofs & coastal warehouse wall cladding
    EPS (Expanded Polystyrene) Density 15-20 kg/m³ / λ ≈ 0.035 – 0.038 W/m·K Lightweight economic wall partitions & site office enclosures
    Plywood Foam Composite Structural Marine Plywood + High-Density XPS Core Load-bearing flooring decks & internal partition walls
    Snap-N-Lock Joint System Concealed Interlocking Joint with Dual Seal Gasket Rapid DIY patio, room extension & shelter assembly

    3. Fast Modular Assembly with Snap-N-Lock Interlocking Profiles

    The Snap-N-Lock interlocking profile allows adjacent panels to click together effortlessly without exposed screws, creating an airtight, watertight structural joint in half the labor time of conventional framing.

    4. Sound Damping and Thermal Comfort Performance

    🏠 Occupant Acoustic & Thermal Protection:

    • Rain Noise Reduction: High-density core absorbs impact sound vibrations from heavy tropical rainfall.
    • Continuous Thermal Barrier: Eliminates thermal bridges, lowering indoor summer temperatures by 5°C to 8°C compared to single-skin roofs.

    5. Where Are Building Sandwich Panels Most Commonly Installed?

    🏬 Commercial Warehouses & Factories

    Large-span insulated roofing, exterior wall cladding, and internal office partitions.

    🏡 Modular Homes, Patios & Site Enclosures

    Pre-engineered insulated room additions, sunrooms, and temporary site offices.

    6. On-Site Handling and Fastener Securing Standards

    Panels install onto steel or timber girts using self-drilling screws with EPDM sealing washers. Flashing accessories cover ridges, corners, and eaves for complete weatherproofing.

    Frequently Asked Questions (FAQS)

    1. What is Aluzinc steel coating and why is it superior to galvanized steel?
    Aluzinc consists of 55% aluminum, 43.4% zinc, and 1.6% silicon. It provides 2x to 6x longer corrosion resistance and reflects 65% of solar heat.
    2. How does the Snap-N-Lock joint system work?
    Snap-N-Lock panels interlock with a male-female snap mechanism that conceals fasteners, ensuring airtight joints and fast assembly.
    3. What applications suit EPS core sandwich panels best?
    EPS (Expanded Polystyrene) panels offer a lightweight, budget-friendly solution ideal for interior partitions, site offices, and mild climate walls.
    4. What are Plywood Foam Composite panels used for?
    Plywood foam composite panels combine structural marine plywood with XPS foam for heavy-duty structural flooring, mezzanine decks, and container walls.
    5. Are RaxPanel building sandwich panels fire retardant?
    Yes. All EPS, PUR, and PIR core formulations include flame-retardant self-extinguishing additives to meet international building fire codes.
    6. What standard steel skin thicknesses are available?
    Skin thicknesses range from 0.4mm, 0.5mm, 0.6mm up to 0.8mm depending on purlin span and wind load requirements.
    7. What maximum panel length can be shipped in ocean freight containers?
    Maximum panel length is 11.8 meters to fit standard 40ft HC ocean shipping containers.


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