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What is XPS Foam Board?

Extruded Polystyrene Foam starts as solid pellets of polystyrene resin. We first feed the plastic pellets into an extruder where they are melted and mixed with critical additives to form a viscous liquid. Then we inject a blowing agent to expand the plastic product. Under well-controlled heat and pressure, the plastic mixture is forced through a mould to form the desired shape. Finally, the rigid foam is trimmed to a custom size and this is the final XPS foam board.

Features of XPS Insulation Board

(1) Superior thermal Insulation
XPS insulation board has dense surface layer and closed-cell structure inner layer. Its thermal conductivity is much lower than EPS, so it has better thermal insulation performance than EPS. For the same exterior walls, its thickness can be less than other types of insulation materials.
XPS insulation board has an excellent R-value, which is a measure of the insulation's ability to resist heat flow. The higher the R-value, the more effective the insulation is at preventing heat transfer. XPS insulation board typically has an R-value of 4.5 to 5 per inch, which is higher than many other types of insulation materials. This high R-value makes XPS insulation board an ideal choice for homes and buildings in areas with extreme temperature fluctuations.

(2) Excellent resistance to moisture
Even in a highly humid environment, Extruded polystyrene board can still maintain good thermal insulation performance; suitable for cold storage and other buildings with special requirements for insulation, can also be used as an exterior wall finish material for the building of brick or stone.

(3) Easy to use and install
No special treatment is needed for the construction of XPS foam board.

(4) High compression strength (between 150-1000kpa)
XPS insulation board has a high compressive strength(Between 150~1000 kpa), meaning it can withstand weight and pressure without deforming or breaking. This makes it an ideal choice for applications such as foundations, where the insulation will be subject to the weight of the building. XPS insulation board can also be used in roofing applications, where it can support the weight of foot traffic and other loads.

(5) High density and low water absorption rate      
XPS insulation board is also known for its moisture resistance. The closed-cell structure of the foam makes it difficult for water to penetrate the insulation, making it an ideal choice for areas prone to moisture and water damage, such as basements and crawl spaces. XPS insulation board also does not support mold growth, making it an excellent choice for those with allergies or respiratory issues.

(6) A wide range of applications
It can be used in exterior walls, floors, roofs, cold storage, high-speed rail, etc.

Advantages of Feininger XPS Foam Board

(1) Green and Eco-friendly
Feininger XPS foam board adopts the most advanced CO2 foaming technology, 100% Freon (CFC and HCFC) free production process, which will not destroy the ozone layer.
Therefore, our XPS foam board has higher density and is more eco-friendly. Also, there are no radioactive or volatile substances, free of formaldehyde, safe and environmentally friendly for indoor use.
(2) Multiple capacity options
Feininger offers customized service. We can produce different specifications of XPS insulation board to meet the market and customer needs.
(3) Excellent after-sales team
We have domestic and foreign XPS extruded board experts who are providing 24-hour online service.
(4) Own many international certifications and technology patents, such as ISO9001:2008, ISO14001:2004 and CE
(5) Demonstration unit of world environmental protection organization and president unit of China Polystyrene Association.
(6) Developed and manufactured the first extruded polystyrene foam production line in China.

Feininger XPS Foam Board Specification


  Blue, Yellow, White


  1.2m, 2.4m, 2.5m or Customization


  600mm, 1200mm or Customization




  Smooth, Roughen, Grooving, Embossing   

Compressive Strength


Water Absorption


Heat Conductivity Coefficient


Fire Rating

  B1, B2, B3



Applications of XPS Insulation Board

XPS extruded insulation board has superior insulation performance, excellent vapor barrier property, and extremely low water absorption under high humidity environments.

(1) Civil Engineering 
XPS extruded foam board can settle the problem of water channels frost cracking in canal engineering in cold regions. In the South to North Water Diversion Project XPS boards were used as the anti-frost material of the channel. The bonding strength is high between Feininger XPS foam boards and concrete layers. The engineering practise applications show that the XPS board can meet the requirements of mechanized concrete construction.

(2) Cold Storage Purification Engineering 
XPS foam boards can prevent moisture condensation effectively. Therefore, this material is widely used in cold storage rooms with superior resistance to water vapor penetration and high compression performance.

(3) Building Insulation and Decoration Field
Usually, about 15%-20% of the heat loss is through the floor/roof in buildings, so it's very important to offer dwellers a comfortable environment by effective insulation treatment to avoid condensation on the floor/roof. XPS foam board as building insulation has incomparable advantages. It can be used in the following fields.
* Roof insulation system
* Wall insulation system
* Floor insulation system
* Basement insulation system
* All kinds of composite sandwich panels
* Decorative molding 
* Decorate condole top

Feininger XPS Insulation Board Cases

(1) Nanjing South Railway Station
(2) Beijing-shanghai High Speed Railway

XPS Foam Board vs EPS Board

Performance Extruded Polystyrene (XPS) Expanded Polystyrene (EPS)
Raw Materials Polystyrene resin Polystyrene resin
Manufacturing Process XPS is manufactured using an extrusion process. This continuous process produces a closed cell structure with a smooth skin on the top and bottom of the board. EPS is made from foam beads in a mould, and then heat or steam is applied directly to the beads, causing them to expand and fuse together.
Thermal Conductivity (W/m·K) ≤0.030 ≤0.042
Compressive Strength 150KPa-1000KPa Up to 400Kpa
Water Absorption ≤1.5% ≤4%
Size Width: 600mm, 1200mm or Customization
Length: 1.2m, 2.4m, 2.5m or Customization
Thickness: 6mm-120mm
Width: up to 1200mm
Length: up to 400mm
Thickness: up to 90mm




In summary, the biggest difference between XPS foam boards and EPS is the cell structure, therefore, compared to XPS, EPS has worse water absorption and a lower R-value per inch.

Extruded polystyrene foam insulation boards feature very well defined, uniform closed cells and continuous walls. The combination of water-resistant polystyrene polymer and closed-cell walls allows XPS foam to achieve a very low water absorption rate.

How to distinguish between inferior and high quality XPS foam board?

In the extruded polystyrene board market, some inferior products are mainly made of recycled plastic foam, such as plastic lunch boxes, so their quality is not up to standard, and the compressive performance is also extremely poor.

The use of this inferior XPS insulation board may cause the ground cracking deformation, because it contains a large number of impurities, the water content will gradually rise in the process of use.

On the one hand, it will lead to a decrease in the insulation effect of the extruded board. On the one hand, this kind of board can not achieve the insulation effect in the wet environment, and will also cause great harm to health.

So what are the advantages of high quality XPS foam board?

Using good quality XPS insulation board as external wall insulation, the temperature of the structural layer wall part is close to the indoor temperature, which means that when the indoor air temperature rises or falls, the wall can absorb or release energy, which is conducive to maintaining stable room temperature.

In winter, when the heat from the room tries to pass through the wall, it will be blocked, thus reducing the consumption of indoor heat; In summer, XPS insulation board will block solar radiation and external heat into the room. Therefore, XPS foam board is able to create a comfortable environment both in cold and hot seasons.

Feininger XPS foam boards adopt world-class production lines and are manufactured in strict accordance with the ISO system. The products have superior thermal insulation, good moisture resistance and high compression resistance.

How long does XPS insulation board last?

Because of its robustness and water resistance, rigid foam insulation board like XPS insulation board typically lasts 100 years or more, which means you never have to worry about replacing it.

Is XPS foam board environmentally friendly?

XPS insulation board is 100% recyclable and can contribute greatly to reducing energy consumption. Once installed, it can last for decades, significantly reducing a building's carbon footprint over its lifetime.

Tips for selecting best XPS insulation board

xps insulation board1 xps insulation board 2


Generally speaking, there are many kinds of colors of XPS insulation boards on the market, such as black, white, and blue. But the color actually doesn't affect the quality of XPS insulation board, as long as it does not turn grey, black or dark. In addition, we can break the polystyrene foam board and smell the odour. High-quality XPS foam board is basically odourless after breaking, while poor quality one will be affected by raw materials and other additives, producing a pungent plastic smell.

Foam Cell
The main use of extruded polystyrene foam board is energy saving and heat preservation, which is mainly due to its continuous and uniform closed cell structure on the surface. When you observe the board, you will find that there are many foam cells on it, which are for better concentration of heat, to absorb the heat from the air evenly and distribute it evenly. So the more uniform these foam cells are, the better the quality of XPS insulation board will be.

Compressive Strength
Since extruded foam boards are often used for floor heating insulation, basement maintenance, road base insulation, airport floor insulation, etc., the compressive strength should not be neglected. Usually, XPS foam board for floor heating requires a compressive strength of 200KPA or more. Therefore, when buying XPS insulation boards, you must make a clear inquiry from the XPS foam board supplier, and then select based on your needs.

Besides, we can also use our fingers to press gently to test its compressive effect. Under normal circumstances, the press marks of high-quality extruded panels are basically invisible to the naked eye, but inferior extruded panels have obvious dents when pressed, so you need to be more careful when selecting.

Raw Material
High-quality XPS insulation boards are made of polystyrene resin as the raw material, and it is important for buyers to note whether the product is made of this material when selecting it. Many people will tend to choose a lower-priced product, but that kind of extruded foam board is usually of poor quality and is likely to be made of used boards. The extruded foam board made of polystyrene resin not only has uniform and dense foam cells and outstanding insulation effect, but also has a long life span of up to 50 years or more.

Feininger is a professional XPS insulation board manufacturer. Our products adopt world-class production lines and are manufactured in strict accordance with the ISO system. Feininger XPS foam boards have superior thermal insulation, good moisture resistance and high compression resistance. If you want to buy high-quality XPS foam boards, contact us now!

Fire Rating of XPS Foam Board

XPS foam boards are mainly used for the exterior wall insulation of buildings and have good thermal insulation properties. In China, the exterior wall insulation materials are divided into 4 levels: Class A (non-combustible), B1 (flame-retardant), B2 (combustible) and B3 (flammable). XPS foam boards are organic materials so they are generally divided into 3 levels: B1 (flame-retardant), B2 (combustible) and B3 (flammable).

In China, XPS foam boards must satisfy the fire rating requirement of at least Class B2. According to the Chinese national standard GB/T 2406.2, Class B2 is equivalent to an oxygen index greater than 26 and Class B1 is equivalent to an oxygen index greater than 30. Customers are often more interested in how Chinese fire ratings correspond to those of European standards. In general, Chinese national standard B1 level corresponds to EN13501 level B and C, while Chinese B2 level corresponds to European level D and E.

The common method to judge the fire rating of XPS foam board is by lighting it on fire with a lighter. And you can also use this method to judge the quality of the XPS insulation board. If it is easy to ignite and can not self-extinguish, is the ordinary extruded polystyrene board; if ignited before removing the open flame, the XPS foam board can self-extinguish, then it is flame retardant XPS foam board; if the open flame point can not ignite the board, that is non-combustible materials. Flame retardant XPS boards need to add different amounts of flame retardants to achieve proper flame retardancy, the higher the fire rating, the higher the price.

Factors Affecting Polystyrene Foam Board Price

Most customers require a thickness of 35mm-85mm, if the required thickness is the same as this range, the price of polystyrene foam board will be less than that of various other thicknesses.

Density has a strong correlation with the cost of producing polystyrene insulation boards. If you want XPS foam boards with a higher density, that means you will have to pay more

Typically, XPS foam boards are available on three surfaces, smooth or skinned surfaces, grooved surfaces and rough surfaces. The smooth or skinned surface is the least expensive.

Compression Strength
The compression strength of a polystyrene foam board affects its density. If you need a high compression strength insulation board, then you will have to pay more than what an average strength board would cost.

Thermal Conductivity
Thermal conductivity is a main performance parameter of XPS insulation board. The lower the thermal conductivity data is, the better the thermal insulation performance of XPS board is.Thermal conductivity is an important reference for product quality, which mainly affects the price.

Dimensional Stability
The maximum shrinkage rate of a styrofoam board is less than 2%.

Specific Size
The length of the polystyrene foam board has little to do with its price. If you want a custom size and are ordering a small quantity, perhaps the XPS foam board manufacturer will charge you a small fee.

If your order is large enough, you may negotiate with your XPS insulation board supplier to get a competitive price.

XPS Insulation Board vs. Other Insulation Materials

While XPS insulation board offers many benefits, it is important to consider how it compares to other types of insulation materials. Here are a few comparisons:
XPS Insulation Board vs. EPS Insulation Board
Both XPS insulation board and EPS insulation board are made from polystyrene foam, but there are some key differences between the two. XPS insulation board has a higher R-value and is more moisture-resistant than EPS insulation board. However, EPS insulation board is more affordable and can be recycled, making it a more environmentally friendly choice.

XPS Insulation Board vs. Fiberglass Insulation
Fiberglass insulation is a popular choice for home insulation, but it has some drawbacks compared to XPS insulation board. Fiberglass insulation has a lower R-value and is more prone to moisture damage. It can also be a health hazard if inhaled, whereas XPS insulation board is safe and does not release harmful particles into the air.
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