10 advantages of XPS insulation board10 advantages of XPS insulation board
1. Why does XPS extruded board not absorb water, has low thermal conductivity, and good thermal insulation effect? XPS extruded board is made of polystyrene, various additives and foaming agent, mixed, melted, pressurized and kneaded in the extruder, extruded through the die, the pressure is released, the foaming agent is vaporized to form tiny bubbles , Encased in polystyrene film bubble, cooled and shaped to form a honeycomb plate with uniform cross section and closed cell. This structure determines its excellent thermal insulation performance, thermal conductivity is lower than (0.027), because it is a closed-cell structure, the water absorption rate is extremely low.
2. Is XPS extruded board the heavier the bulk weight, the better?
At present, some manufacturers on the market mislead consumers, saying that the heavier the weight of XPS products, the better. In fact, it is not the first thing to confirm that we need insulation materials, and its purpose is to insulate heat. According to the theory that the heavier the better, the product is not foamed, can we still buy it? Is the lighter the better? Nor is it. If the foam is too light, the compressive strength of the product decreases. In order to achieve thermal insulation, XPS extruded board can only achieve the effect of thermal insulation with proper foaming. The uniformity of the cell structure determines the performance of the product.
3. The relationship between bulk density and compressive strength and thermal insulation performance?
The normal requirements of XPS extruded board are: good thermal insulation and high compressive strength. But this is contradictory. High compressive strength, large product capacity, low foaming ratio required, and reduced thermal insulation performance; good thermal insulation, high foaming ratio, light product weight, reduced compressive strength; the appropriate relationship between the two is The key to ensure product performance; to ensure that the product has a high foaming ratio and good compressive strength is the ideal product. That is, the lighter the product bulk density and the higher the compressive strength, the better the product.
4. The relationship between cell structure and compressive strength and thermal insulation performance?
Cell structure: cell diameter size and cell shape. Good quality products: the cell structure is the cell size is small and fine, the cell distribution is uniform, the cell shape is round; under the microscope, it is shown as a closed honeycomb structure, the cell is fine and very large, and the cell size is round It has high compressive strength and good thermal insulation performance. Poor quality products: the structure of the cell is that the cell size is large, the size is uneven, and the size is different. Cells are unevenly distributed, and the cell shape is shown as oblong in the stretching direction or oblong in the thickness direction or oblong in the width direction; under the microscope, the pore size of some open cells is uneven, the cells are thick and foamy The amount of holes is small, the size is oblong, so the compressive strength is poor, and the thermal insulation performance is poor.
5. Is the quality of XPS extruded board made of new materials and recycled materials the same?
The quality of products produced by new materials and recycled old materials is different. The new material polystyrene is polymerized with low-molecular-weight containing double bonds, with a large molecular weight and a long molecular chain. During the molding process, it can ensure good film-forming property of the foam cells, uniform cell formation, thin cell walls, and high compressive strength of the product. Break down small pieces of product by hand, and can rebound after squeezing hard; the hardness of the new material product is uniform in all directions; the new material product falls gently on the desk surface and emits a soft impact sound; the old material is recycled after many times of high temperature, high pressure and Shearing, the molecular chain is cut short, the molecular weight becomes smaller, the porosity rate becomes larger, the film forming property of the foamed cell becomes worse, the porosity becomes poorer, the cell wall becomes thicker, the hardness becomes larger, the elasticity is poor, and the product life becomes shorter , Insulation performance becomes poor. Break the small pieces of product by hand, pinch it firmly and don't rebound. Recycled old products have high skin hardness, soft heart, and the fingers do not rebound; the old products are lightly dropped on the desk surface and emit a crisp and rigid impact sound.
6. In order to meet the 65% energy saving requirement, will the replacement of EPS polystyrene board with XPS extruded plastic board cause a significant increase in construction cost?
will not be greatly improved. Compared with the former, the price of XPS extruded board and EPS polystyrene board is higher than the latter, but according to the 65% energy saving standard, the EPS polystyrene board in Beijing needs 8-10 cm thick, and the XPS extruded board only needs 5 cm thick. That's it. Due to different thicknesses and different construction practices, the construction cost of thermal insulation system is almost the same. XPS extruded board and EPS polystyrene board have different application effects. The thermal resistance coefficient of XPS extruded board is constant and basically unchanged, no water absorption, high compression and bearing capacity, and long life; the thermal resistance coefficient of EPS polystyrene board will gradually increase with time, easy to absorb water, compression resistance and poor bearing capacity, easy Aging, life is not long.
7. What is the flame retardant standard of XPS extruded board?
At present, the new GB8624 "Building Materials (Products) Combustion Performance Classification" standard is under review and will be issued soon. The standard adopts the new EU standard. The current national standard GB8624 "Building Materials (Products) Combustion Performance Classification" standard stipulates: B2 level is the basic standard of XPS extruded plastic board (oxygen index ≥ 26).
8. Is self-extinguishing from fire a fire-retardant standard for XPS extruded board at the construction site?
B2 level (oxygen index ≥26) is the test result of XPS extruded board required by the national standard under laboratory conditions. It has strict test conditions and cannot be simply understood as self-extinguishing from fire. In the construction site, many people ignite the vertical (non-inclined) XPS extruded board with an open flame on the facade (non-angular corner) to see if they leave the fire source and extinguish themselves. There is something to learn from, but it is not scientifically rigorous.
9. Inverted roof:
Inverted roof insulation structure is to place the extruded plastic board on the roof waterproof layer to protect the waterproof layer from temperature difference, ultraviolet rays and external or artificial impact damage, thus protecting the waterproof layer of a layer system. Overall, the use of inverted roofs is a good choice for energy-efficient roofing. Advantages: XPS extruded board has high moisture and moisture resistance, basically does not absorb water; high compression resistance is at least 250kpa, insufficient compression resistance will affect the scope of application on the roof; low thermal conductivity = high thermal resistance coefficient; safe working temperature ，Applicable to the temperature range of -30℃～70℃ without decomposition or softening; simple structure and convenient construction.
10. Insulation inside and outside walls
It is the main material of the external wall internal insulation system. It is the main material of the extruded plastic board. The extruded plastic board is fixed on the inner surface of the outer wall surface by means of sticking and nailing. Plastic coated mesh cloth as a reinforcement layer, the surface is then a thermal insulation form smoothed with water-resistant putty. The surface layer of the decorative surface is mostly pasted with paint or adhesive with high adhesion.