What is the difference between EPS fire resistance levels A ...

The difference between EPS fire resistance grades A, B, and B1:

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1. Fire resistance coefficient: Class A is non-combustible; Level B is further divided into three levels: B1, B2, and B3, which represent varying degrees of combustibility.
2. Flammability: Class A has zero flammability, while B1 is flame-retardant, B2 is flammable, and B3 is also flammable.
   Common A-grade products in the market include phenolic aldehyde, rock wool, insulation mortar, foam ceramics, foam glass, and foam concrete. Currently, the most advantageous A-grade material is foamed concrete, also known as foamed cement.
   EPS polystyrene board is inherently flammable and thus does not qualify as a fireproof material. Therefore, it does not meet A-level or B1 standards. The fire resistance ratings for polystyrene boards available in the market are only B2 (flammable) and B3 (flammable).
   Extended Information:
   EPS Physical and Mechanical Properties:
3. Density
   The density of EPS is determined by the expansion ratio of polystyrene particles during the forming stage, typically ranging between 10 and 45 kg/m³. For engineering use, its apparent density generally falls between 15 and 30 kg/m³.
   Currently, the density of EPS used as lightweight filling material in road engineering is approximately 20 kg/m³, which is 1% to 2% of that of conventional road filling materials. This density is a crucial indicator of EPS, as its mechanical properties are almost directly proportional to density.
4. Deformation characteristics
   When the confining pressure exceeds 60 kPa, the yield strength significantly decreases, which is noticeably different from the behavior of soil. When axial strain ε approaches 5%, regardless of confining pressure, volumetric strain εv is similar to axial strain εa. The lateral deformation of EPS is minimal, indicating a low Poisson’s ratio.
   To minimize post-construction settlement, after laying the EPS material layer, fill 1.2 m of soil on it for preloading. The average compressive settlement of the EPS material layer is about 32 mm, which allows for the calculation of the elastic modulus of EPS at 2.4 MPa while the EPS remains in the elastic deformation phase.
5. Self-reliance
   The self-supporting properties of EPS are beneficial for the stability of high slopes. The minimal lateral pressure generated by the vertical compression of EPS allows it to effectively reduce the soil pressure behind abutments when used as filling material for roadbeds.
   The friction coefficient f between EPS blocks and sand is 0.58 (dense) to 0.46 (loose) for dry sand and 0.52 (dense) to 0.25 (loose) for wet sand; the friction range between EPS blocks is between 0.6 and 0.7.
6. Water and temperature characteristics
   The closed cavity structure of EPS ensures excellent insulation performance. Its primary characteristic as insulation material is its extremely low thermal conductivity, with various EPS board specifications showing thermal conductivity ranging from 0.024 W/m·K to 0.041 W/m·K. EPS, being a thermoplastic resin, should be used below 70°C to prevent thermal deformation and strength reduction.
   This feature allows for the use of electric heating wire in processing. Flame retardants can be added during production to create flame-retardant EPS, which extinguishes itself within three seconds after being removed from the ignition source. Due to its significantly lower bulk density compared to soil, the 1% to 10% increase in bulk density caused by water absorption has negligible impact on engineering.
7. Durability
   EPS maintains stable chemical properties in water and soil, resisting decomposition by microorganisms. Its cavity structure slows water infiltration significantly; however, prolonged exposure to ultraviolet radiation may cause the surface of EPS to yellow, leading to some brittleness. EPS is stable in most solvents but can be dissolved by organic solvents like gasoline, diesel, kerosene, toluene, and acetone, indicating that EPS fillers require a good protective layer.

Expandable Polystyrene (EPS)

Revolutionary Patented Polystyrene Production Method

Expandable polystyrene (EPS) consists of polystyrene micro-pellets or beads containing a blowing agent and other additives for foaming. We have developed a continuous production process where the blowing agent is directly injected into the melt, followed by underwater pelletization.

Commercial EPS is produced with a blowing agent, typically a chlorinated hydrocarbon or a low-boiling petroleum-derived agent containing pentane. These substances are flammable; reducing the amount of flame retardant by adding gypsum increases the burn rate during flame propagation tests.

Main Benefits

• The patented EPS process is economical, compact, and easy to operate.
• Continuous processing ensures consistent product quality.
• Allows the dispersion of a wide range of additives and pigments.
• Minimized waste production.
• Reduction of wastewater and process water.
• Recycling of waste EPS pellets/beads/foam is possible.
• The process enables the development of innovative applications.

Main Applications

• Expandable Polystyrene

EPS Panel

The self-extinguishing, fire-retardant EPS Panel foam is manufactured from 100% virgin beads and is oven-cured to ensure the resulting blocks are completely dry and free from residual pentane.

To learn more, please visit our website china anti-flammable xps foam board.

EPS Panel is a lightweight, CFC-free, non-brittle, closed-cell insulator with consistent thermal performance over time. It features high dimensional stability and low water vapor transmission.

A special chemical coating applied to the Expanded Polystyrene beads distinguishes it from standard/common EPS Panels. Fire-Retardant EPS Panel is a self-extinguishing, non-combustible material.

Fire-retardant EPS Panel with a density of 15 kg/m³ is ideal for clean rooms, food processing facilities, and modular buildings, while the 20 kg/m³ density variant is suitable for industrial and commercial cold storage.

Core Specifications
Width (cover mm)
Thickness (mm)
Length
Exterior Facing Skin
Internal Facing Skin
Standard Colors
Joint System
Finishes
Type of Skin EPS
(Expanded Polystyrene)
1,160
50, 75, 100, 125, 150, 200, 250
Up to 12 meters
0.5mm, 0.6mm G300 CRP Steel
0.5mm, 0.6mm G300 CRP Steel
Off White
Slip Joint
Plain, Ribbed, Diamond
Anti-Bacterial (AB)
Food Grade (FG)
Xterior Roof and Wall (XRW)

Contact us to discuss your requirements with a china anti-flammable xps foam board manufacturer. Our experienced sales team can help you find the solutions that best meet your needs.

Features and Advantages

• Fire retardant.
• Meets safety requirements.
• Energy-saving.
• Longer lifespan.
• Resistant to termites and rodents.
• Customized design.
• Easy to install, saving on installation time and costs.
• High performance as an insulated panel.