Flame Retardant Grade – F – Building Material Thermal Insulation

Product introduction

The F-flame retardant grade EPS is not just another insulation board. It’s a fire retardant polystyrene material that has passed UL certification (no. E360952). In the production line, mixing with ordinary EPS is a big no-go—once you do that, the flame resistance of the EPS insulation material will drop fast. This grade follows GB/T10801.1-2002 and GB8624-2012, both key national standards for EPS foam insulation. To achieve reliable B2 performance, the material needs proper aging. Residual blowing agents must escape from the foam body. It’s the same principle whether you’re dealing with expanded polystyrene bead insulation, EPS wall insulation, or even larger polystyrene blocks for construction.

Typical numbers from real production:

15 KG/M³: 20 mm thick, at least one week aging period 20 mm thick, at least two weeks aging period

30 KG/M³: 50 mm thick, at least two weeks of aging 50 mm thick, at least three weeks of aging

Product characteristics

• Strong and reliable flame retardant performance, making it suitable for B2 standard building materials.
• Short lead time—production and pre-delivery can be handled quickly without long waiting cycles.
• Raw beads have a uniform particle size and smooth flow, so the expanded polystyrene beads insulation process runs steadily.
• Flexible to use: works well on both fully automatic and manual plate-making machines.
• The foamed beads form fine, even cells, giving the final product a smooth and consistent surface.
• Excellent dimensional stability, strong adhesion, plus a balance of toughness and strength.
• The recommended foaming rate is around 35–75 times, depending on project needs.
• Well-suited for applications like EPS foam insulation, EPS wall insulation, and polystyrene blocks for construction.

Product Advantages

• Higher safety level: Using certified fire retardant polystyrene means the walls and panels aren’t just insulation; they add a layer of protection.
• Compliance with international and national standards: This EPS insulation material passed UL certification (E360952) and meets GB classifications.
• Cost-effectiveness in construction: Thanks to lightweight structure and efficient EPS foam insulation, transportation and on-site handling are easier, saving both labor and energy.
• Versatility in application: From EPS wall insulation in a small housing block to polystyrene blocks for construction on a factory site, the same material adapts.
• Stable long-term performance: The EPS insulation foam material keeps its shape, holds up against moisture, and the insulation value doesn’t drop off quickly. Less maintenance, fewer replacements.
• Environmentally friendly: Over time, energy savings add up. Plus, compared with regular non-flame-retardant foams, there’s less waste in production.

Application Field

• EPS wall insulation: widely used in residential apartments, office buildings, and commercial complexes.
• Polystyrene blocks for construction: suitable for high-rise structures, foundation insulation, and load-bearing wall systems.
• EPS foam insulation panels: applied in industrial workshops, warehouses, and cold storage facilities.
• Roof and floor insulation: improves thermal efficiency while reducing energy costs. 
• Sandwich panels and modular systems: suitable for prefabricated housing and lightweight construction.