Several Characteristics Of Fiberglass Board On The Market
Generally refers to the hard flat refractory fiber products containing inorganic or organic binders. The so-called binding agent refers to the material added to non-plastic particles or fiber materials to make them have working performance, blank strength or dry strength.
The so-called refractory fiber refers to the man-made mineral fiber that is suitable for thermal insulation materials above 800 ℃. Fiberglass board has the following characteristics:
1. classification temperature.
The classification temperature refers to the maximum temperature at which the linear shrinkage is less than the given value, expressed in ° C with an interval of 50 ° C. The heating permanent linear change of refractory fiber products shall be determined according to gb/t17911-2006. The heating linear shrinkage of refractory fiber boards and special-shaped hard products shall not exceed 2%, that is, the classification temperature. In gb/t3003-2006 refractory ceramic fibers and products, the classification temperature of ceramic fibers and products is divided into 19 grades, from 850 ℃ to 1750 ℃.
The classification temperature represents the heat resistance index of refractory fiberboard and is the most basic performance to ensure the correct use of refractory ceramic fiberboard.
2. bulk density.
Bulk density refers to the ratio of drying mass of fiberboard to its total volume. Generally, the bulk density of fiberboard is within 200kg/m3. In gb/t3003-2006 ceramic fibers and products for refractories, the nominal bulk density of fiberboard is 260, 280, 300, 320, 340, 360, 380, 400kg/m3.
3. compressive strength.
It refers to the ultimate load that a rigid fiber product can bear per unit area at room temperature. Compressive strength is one of the important performance indicators to measure the quality of rigid fiber products, which can indirectly reflect the product structure, such as compactness, uniformity, sintering and so on.
Change of heating permanent line.
The residual linear expansion or contraction of refractory materials after heating to the specified temperature, holding for a certain time and cooling to normal temperature without external force. The research results at home and abroad show that the heating line change test of fiber products requires 24 hours of insulation, and the linear shrinkage of fiber products tested after 24 hours of insulation reaches more than 75% of the linear shrinkage after long-term use. The test results of the heating line shrinkage of the product after 24 hours of heat preservation can be used to indicate the permanent heating line change during the long-term use of the product.
