1. Environmental protection
Because of the concealment of the extruded board, the market is filled with a large number of extruded sheets made of recycled plastic. Sources of recycled plastics include: plastic lunch boxes, plastic bags, foreign garbage, and more.
Recycling of plastics is a good thing in itself, but many plastic recycling companies have low capabilities. Most enterprises still stay at the level of small workshops. They simply do not have the ability to separate plastics that are toxic and non-recyclable, so they are heavily flooded with metals and toxic. Polyvinyl chloride regrind is used in the manufacture of extruded sheets.
Although the use of recycled materials can achieve the purpose of reducing costs, but in the relatively high temperature of the floor heating will release unidentified harmful gases, not only unpleasant, but also a strong stimulating effect on the human eye and respiratory mucosa, light can cause headache, nausea Symptoms such as allergies, and severe cases can cause damage to the liver and nervous system of humans, which is very harmful to human health.
2, pressure resistance
Inferior extruded board has poor pressure resistance, which is easy to cause ground settlement and cracking.
In the recycling process, polystyrene needs to be re-melted at a high temperature, which causes a large number of molecular chains to break, and as a result, the strength of the extruded board is greatly reduced. In order to reduce the cost, many small factories try to reduce the density of the extruded board, which also directly leads to the low pressure resistance of the extruded board. Intuitive performance is a step on a footprint. Inferior extruded boards are heavily pressed by the furniture during use, which causes the ground to settle and the concrete layer to crack.
The high quality extruded board has a compressive pressure of more than 20 tons per square meter.
3, water absorption
The inferior extruded board has high water absorption rate, the heat preservation effect is obviously reduced, and the mold is easy to be ingested.
The water absorption rate of the extruded board is an extremely important indicator! The inferior extruded board has large and uneven pores, and the water will gradually penetrate into the sheet through the pores.
Moisture is an important condition for mold growth! The porous material after water absorption is a suitable place for mold growth. When mold is harmful to health, it will accelerate the degradation of plastics and affect the life of extruded boards.
The water content is also an important factor affecting the insulation effect of the insulation board. For every 1% increase in moisture content, the insulation effect is reduced by about 10%.
4, thermal conductivity
Inferior extruded board has poor thermal insulation effect, which directly leads to an increase in the operating cost of post-floor heating.
The main indicator for measuring the thermal insulation effect of thermal insulation materials is the thermal conductivity. The lower the thermal conductivity, the better the thermal insulation effect. The thermal conductivity of high-quality materials should be less than 0.030, the inferior thermal conductivity is greater than 0.040, and it will rise as the water absorption increases.
As an ordinary consumer, how do you distinguish the advantages and disadvantages of extruded boards?
1, look at the color
The darker the extruded board, the more dim it contains the recycled material. The extruded board with the new material is light and white and uniform.
2. Use finger pressure to see the ability to withstand pressure.
The smoother the surface, the better the extruded board with higher strength
3. Look at the cross section.
The smaller the cell of a good extruded board, the more uniform, the higher the strength and the lower the water absorption rate.
4. Smell the smell.
The inferior extruded board has a large smell, the good extruded board has no taste, and there is a national environmental inspection report.