Structural Forms
• Single-layer sheet: Primarily used as an inner lining or for localized reinforcement, typically 1-3mm thick.
• Sandwich composite sheet: The mainstream structure, consisting of two layers of FRP panels and an insulating core, with an overall thickness of 50-100mm. The core material is mostly rigid polyurethane (PU) foam, with some using XPS or honeycomb panels.
Core Performance Requirements
• Mechanical Properties: Must withstand vibrations, impacts, and cargo compression during vehicle operation. For example, a 2.5mm thick FRP sheet can achieve a tensile strength of 166MPa, a flexural strength of approximately 248MPa, and an impact strength of approximately 143kJ/m².
• Thermal Insulation: To achieve the -18℃ freezing requirement, the overall heat transfer coefficient (K-value) of the compartment must be below 0.3 W/(m²·K). This relies on a combination of low thermal conductivity PU foam core material (λ≈0.018-0.028 W/(m·K)) and FRP panels (λ≈0.23 W/(m²·K)).
• Surface and Hygiene: The inner surface must be smooth, crack-free, and easy to clean and disinfect. Food-grade resin is typically used, or a corresponding food-grade testing report is provided to meet the hygiene standards for food and pharmaceutical transportation.
• Weather Resistance and Corrosion Resistance: The outer surface must be resistant to ultraviolet radiation, high and low temperatures (-40℃ to +120℃), and have good resistance to rainwater, acids, alkalis, and salts to prevent aging, cracking, and corrosion.
Typical Specifications Reference
• Panel Thickness: 1.0 - 3.0 mm
• Panel Width: ≤ 3.0 m
• Panel Length: Customizable, commonly 9-10 m
• Core Material Thickness: 50 - 100 mm
• Core Material Density (PU): 42 - 50 kg/m³
🏢 Fiberglass Reinforced Plastic (FRP) Panels for Buildings
FRP panels for buildings are mainly divided into two categories: composite wall panels used as enclosure materials and cleanroom panels used as decorative linings.
1. As Prefabricated Building Wall Panels
These wall panels must meet the industry standard JG/T 578-2021 "Technical Requirements for Wall Panels for Prefabricated Buildings". Core performance requirements include:
• Structural Safety: Must withstand wind loads (wind pressure ≥ 1.0 kPa), earthquakes, etc., ensuring that the panel deflection is within allowable limits (e.g., L/250) and that no plastic deformation or detachment occurs.
• Physical Properties: Clear requirements are set for airtightness, watertightness, in-plane deformation (seismic resistance), and sound insulation (compliant with GB 50118).
• Thermal Performance: The heat transfer coefficient (K-value) must meet building energy efficiency design standards (e.g., GB 50176, GB 50189).
• Fire Safety: Combustion performance must be no lower than Class A (non-combustible) or Class B1 (flame-retardant) as specified in GB 8624.
• Durability and Environmental Protection: Material radioactivity (GB 6566) and indoor environmental pollution (GB 50325) must meet standards.
2. As Cleanroom/Decorative Interior Wall Panels
Commonly used in cleanrooms or laboratories in pharmaceutical and electronics factories. Core requirements are as follows:
• Surface Characteristics: Smooth and flat surface, non-dust-absorbing, easy to clean, dust-free; joints must be sealed.
• Chemical Resistance: Able to withstand repeated wiping with common disinfectants.
• Antibacterial and anti-mildew properties: Possesses antibacterial and anti-mildew properties, complying with GMP and other cleanroom standards.
• Physical properties: Possesses sufficient bending strength and impact resistance to meet the stress requirements during installation and use.
📊 Core Differences Comparison
Comparison Dimensions: Refrigerated Truck Fiberglass Panels, Architectural Fiberglass Panels
Core Functions: Load-bearing, insulation, sealing, weather resistance; Enclosure, insulation/heat insulation, sound insulation, fire resistance, decoration
Structural Forms: Primarily sandwich composite panels; Composite wall panels, cleanroom panels, decorative panels, etc.
Key Performance: Mechanical properties, K-value, hygiene, weather resistance; Structural safety, fire rating, sound insulation, thermal performance, environmental protection
Typical Standards: Enterprise standards, GB 29753 (whole vehicle), JG/T 578-2021, GB 8624, GB 50016, etc.
Panel Thickness: 1.0 - 3.0 mm; 1.0 - 5.0 mm (depending on application)
Core Material/Backing: PU/XPS foam, honeycomb panel; Rock wool, polyurethane, gypsum board, light steel keel, etc.
💡 Material Selection and Communication Suggestions
1. 1. Define the intended use: First, determine whether it's for refrigerated truck compartments or building walls, as the standards and focuses are completely different.
2. Specify key specifications: When communicating with the manufacturer, directly provide core requirements such as thickness, core material, K-value, fire resistance rating, and hygiene requirements. This is more efficient than vague discussions.
3. Request testing reports: Request the manufacturer to provide authoritative testing reports from authoritative institutions on mechanical properties, thermal insulation, fire resistance, and hygiene (if applicable) to ensure product performance meets standards.