There are many factors to affect the performance of rock wool, but acidity coefficient, as an important index, shall affect the quality of rock wool directly.
Acidity coefficient affects the melting of rock wool directly. A lot of experiments show that the acidity coefficient of rock wool is lower, the restriction of rock wool to melting will lower. The temperature to melt the rock wool with acidity coefficient of 2.0 is 130℃ to 150℃ higher than that to melt the rock wool with acidity coefficient of 1.0, which shows that the rock wool material that has high melting difficulty with high acidity coefficient shall need more fuel correspondingly and has very high requirements to equipment and refractory materials.
Acidity coefficient shall affect the water resistance of rock wool. When the acidity coefficient of rock wool is higher, the water resistance will be higher, and when the acidity coefficient is lower, the water resistance will lower greatly. If the acidity coefficient of rock wool board is too low, it will break fiber, pulverize and at last lose the due strength to sink and pile up by suffered from hydrolysis in grid structure.
There is one more point that acidity coefficient affects the thermal stability of rock wool. Rock wool is an incombustible material. The research of its heat setting is mainly to see whether the rock wool board can maintain its shape normally as it is heated, especially the fire-insulated effect of material used. The rock wool with very low acidity coefficient will shrink sharply at very high temperature, while the rock wool board with high acidity coefficient will have less effect change to its shape at very high temperature.
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