Overview
Fireproof double-layer XPS (extruded polystyrene) board is an advanced insulation material engineered with flame-retardant additives. Unlike standard XPS, this product features a dual-layer structure that enhances both fire resistance and thermal performance. The manufacturing process involves extruding polystyrene with special fire-retardant compounds under high pressure, creating a closed-cell foam structure. The material is particularly valued in construction for meeting stringent fire safety standards while maintaining the excellent insulation properties of traditional XPS. Its double-layer design often incorporates different densities or additive concentrations between layers to optimize performance characteristics for specific applications.
Physical and Chemical Properties
The material exhibits a closed-cell structure with a typical density range of 25-45 kg/m³, providing exceptional compressive strength (commonly 150-500 kPa). Its thermal conductivity ranges between 0.028-0.034 W/(m·K), making it one of the most efficient insulation materials available. The water absorption rate is extremely low (<1% by volume), preventing moisture-related performance degradation. Chemically, the board incorporates flame retardants such as hexabromocyclododecane (HBCD) or more environmentally friendly alternatives. These additives significantly improve the material's fire resistance, typically achieving Class A or B1 fire ratings according to international standards. The material maintains dimensional stability across a wide temperature range (-50°C to +75°C).
Main Applications
In commercial construction, fireproof XPS boards are extensively used in exterior insulation systems (ETICS), particularly for high-rise buildings where fire safety is paramount. They serve as insulation layers in roofs, walls, and foundations, often in conjunction with fire barrier systems. The material is also preferred for cold storage facilities due to its moisture resistance. Industrial applications include insulation for piping systems and refrigeration units. In civil engineering, it's used as lightweight fill material for roadbeds and airport runways. The double-layer version is increasingly specified for projects requiring enhanced fire performance without compromising thermal efficiency, such as hospitals, schools, and public buildings.
Safety and Storage
While the material is inherently flame-retardant, proper installation is crucial to maintain its fire rating. All joints should be tightly fitted, and exposed edges must be protected with fire-rated sealants. During storage, boards should be kept flat to prevent warping and protected from prolonged UV exposure which can degrade surface quality. Workers should use NIOSH-approved dust masks when cutting the material to prevent inhalation of fine particles. Although the flame retardants are chemically bound to the polymer matrix, proper ventilation is recommended during hot-work operations like welding near installed boards. Disposal should follow local regulations for expanded polystyrene materials.
B2B Procurement Guide
When sourcing fireproof double-layer XPS boards, prioritize suppliers who provide full test reports including fire classification (e.g., ASTM E84, EN 13501-1), thermal conductivity values, and compressive strength data. Request samples to verify consistency in density and layer adhesion. For large projects, consider factory audits to assess production quality control measures. Lead times typically range from 2-6 weeks depending on order volume and customization requirements. Many manufacturers offer just-in-time delivery programs for construction projects. Payment terms commonly include 30-50% deposit with balance upon shipment. For international procurement, verify whether the product meets both the origin and destination countries' fire safety standards.
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