Similarities between rock wool and slag wool:
1. Both of them belong to mineral wool, which are non-polar fibrous product formed with natural rock or slag and other raw materials through high-temperature smelter under the role of centrifugal force and wind.
2. The ingredients are silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide and a little iron oxide, etc.; a small number of phenol-formaldehyde resin shall be added in order to make it mold.
Differences between rock wool and slag wool:
Traditionally, the product produced with slag as main raw materials is slag wool and the product produced with natural stone as main raw materials, such as basalt and diabase, is called as rock wool.
Acidity coefficient is generally regarded as the main mark to distinguish rock wool and slag wool from professional view. Acidity coefficient refers to the ratio between the sum of acidic oxide and the sum of basic oxide in the product, i.e.: acid-base coefficient MK = (silicon dioxide + aluminum oxide) / (calcium oxide + magnesium oxide), moreover, acidity coefficient ≥1.6 is rock wool, while acidity coefficient ＜1.6 is slag wool. In general, the acidity coefficient is bigger, the chemical durability of rock wool and slag wool is better. The acidity coefficient of rock wool is higher, so the chemical durability, high-temperature resistance and other performances are superior to that of slag wool.
Main raw materials: the main raw materials of rock wool are basalt, diabase, gabbro, dolomite, limestone and other natural ores, which are generally melted in cupola with coke as fuel; the main raw materials of slag wool are blast furnace slag, steelmaking
slag, titanium alloy slag, non-ferrous smelting slag, iron-melting furnace slag, fly ash,
whirlwind slag, etc., which are also melted in cupola with coke as fuel.
Colors: rock wool is sage green and the main reason is the role of intensive dyeing of
iron oxide (Fe2O3). The color of slag wool is white or off-white.
PH value: generally, PH value of rock wool is less than 4, while PH value of slag
wool is more than 5 and even more than 6.
Water resistance: rock wool has good water resistance; while slag wool has poor
water resistance, so it is not suitable to use in humid environment.
Heat-resistance temperature: the operating temperature of rock wool can reach above 800℃ and softening temperature can reach to 900-1000℃. Slag wool is easy to generate pulverization to disintegrate at 675℃, so the operating temperature of slag wool shall not be more than 675℃.
Corrosion resistance: generally, rock wool has no more sulfur source, except micro-sulfur brought in by coke as smelting by taking basalt or diabase as raw materials, so it has no corrosive effect to metal; the sulfur content of slag wool generated with slag as main materials is around 5%, which would have corrosive effect with metal when it is used in the environment with high humidity.
Thermal conductivity: the thermal conductivity of rock wool is 0.037-0.039W/mk, while the thermal conductivity of slag wool is a bit higher.
Differences between rock wool and asbestos:
Rock wool is made of basalt and other natural mineral ores as main materials by melting at high temperature into fiber and adding proper adhesive through solidification, processing and production, which is widely used in ship, metallurgy, electric power, building and other industries with thermal insulation, heat insulation, incombustibility, light weight, acoustic insulation and other good performances. Rock wool board is a new-type insulated, incombustible and acoustic material. Rock wool has no harm to human health.
Asbestos is a general term of natural fibrous silicoide and a kind of silicates mineral fiber widely used in board fireproofing of building materials. Asbestos fiber refers to inorganic mineral fiber of serpentinite and hornblende series, of which the basic component is hydrated magnesium silicate (3MgO·3SiO2·2H2O). The characteristics of asbestos fiber are heat resistance, incombustibility, waterproofing, acid resistance and chemical resistance. The asbestos fiber has more than 30 types, but there are 3 types used most in industry, i.e. chrysotile, crocidolite and amosite. Asbestos has carcinogenicity, which has the possibility to infect cancer-type mesothelioma and lung cancer in serious environment of asbestic dust.
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