What is mineral wool ?
Mineral wool is a general term for wool like fibers made of molten rock, slag (industrial waste), glass, metal oxide or ceramic soil. Common mineral wool includes slag wool, rock wool, glass wool, aluminum silicate refractory fiber and other varieties.
What is mineral slag wool?
The standard name of mineral slag wool is slag wool. Slag wool is a kind of inorganic fiber which is made of industrial slag such as blast furnace slag, phosphorus slag, fly ash and so on. After processing, it can be made into various products such as board, pipe, felt, belt, paper, etc., which can be used for heat insulation, fire prevention, sound absorption, earthquake resistance, etc. of building and industrial equipment, pipes, kilns, etc.
What is rock wool?
Rock wool is a kind of mineral wool. Rock wool is a kind of fluffy short fine fiber cotton, which is made of natural rocks such as basalt, diabase, dolomite, iron ore, bauxite and so on. After processing, it can be made into various products such as board, pipe, felt, belt, paper, etc., which can be used for heat insulation, fire prevention, sound absorption, earthquake resistance, etc. of building and industrial equipment, pipes, kilns, etc.
What’s the difference between mineral wool and rock wool?
(1) Similarities
a. They are all fiber-shaped insulation products made by high temperature melting and centrifugation;
b. The same product standard, rock wool, slag wool and their products for thermal insulation (GB / t11835-2007), is applied in the industrial field;
c. In the construction field, the same product standard (except external wall insulation) rock wool and slag wool thermal insulation products for building (GB / t19686-2005) shall be implemented;
2) Differences
a. Different raw materials: rock wool is mainly made of natural ore such as basalt (or diabase), mineral wool is mainly made of industrial waste such as blast furnace slag;
b. The mechanical properties, temperature resistance and chemical stability of rock wool are better than those of mineral wool;
c. Mineral wool contains more alkaline compounds, and its volume stability and water resistance are worse than rock wool in humid environment;
d. The acidity coefficient of mineral wool is lower than that of rock wool, and its weather resistance and service life are worse than that of rock wool;
e. The use temperature of mineral wool fiber is lower than rock wool, and its volume stability at high temperature is worse than rock wool.
What does the acidity index of rock wool mean?
The acidity coefficient is the index value to measure the chemical durability of rock wool, which is the mass ratio of the sum of silica and alumina, calcium oxide and magnesium oxide in the fiber composition. Acidity coefficient is an important index to evaluate the quality of rock wool products. It has high acidity coefficient, good weather resistance and long service life. At the same time, the acidity coefficient is also an important means to distinguish rock wool and slag wool. The acidity coefficient of slag cotton is less than 1.5, and that of basalt is more than 1.6.
How are rock wool products produced? What are its characteristics?
Good rock wool products are made of selected basalt as the main raw material, which is melted by high temperature (the temperature is more than 1450 ℃), made of inorganic fiber by high-speed centrifugal equipment, then added with special adhesive and dust-proof oil, then laid with roller cotton collection swing belt, and arranged in three-dimensional disordered structure by changing fiber arrangement by special equipment, and finally made by curing and setting equipment New lightweight insulation material. Then, according to different uses, the rock wool board, rock wool felt, rock wool pipe shell and other products are made.
What fields can rock mineral wool products be used in?
(1) Application of rock mineral wool products in buildings: for heat preservation and sound insulation of building walls and roofs, fire prevention and noise reduction of building partitions, firewalls, various sandwich panels, fire doors and elevator shafts.
(2) Application of rock mineral wool products in industry: heat insulation, fire prevention, sound absorption and earthquake resistance of industrial equipment, pipes, containers and various kilns.
(3) Application of rock mineral wool products in shipbuilding industry: Marine rock wool board is used for heat preservation and insulation of ships, fire partition and thermal insulation of power pipes, etc;
(4) Application of rock mineral wool products in other fields: instead of alkali resistant glass fiber woven high-performance alkali resistant gridding cloth, it is used for heat preservation and fire protection of vehicles, mobile equipment, cold storage engineering and air conditioning pipeline.
Make friction and sealing materials.
How long does rock wool age? What are the symptoms of aging?
In theory, rock wool fibers are inorganic fibers that will not age. In the actual rock wool products, in addition to rock wool fiber, a certain amount of phenolic resin and hydrophobic agent are added. These organics will be aged in different degrees in use, which will lead to the loss of use function of rock wool products – aging. The aging of hydrophobic agent of rock wool products is the destruction of hydrophobic film, which leads to the decrease of hydrophobic rate of products, while the aging of phenolic resin is pulverization, which will lead to the obvious decrease of strength of products. However, there is not a recognized time limit for the aging time of different phenolic resins and water repellents.
Rock wool can cause serious harm to human health?
Of course not. The World Health Organization and other organizations have conducted a lot of research on whether rock wool fiber is carcinogenic. The results clearly show that rock wool fiber is not a carcinogen. The results are as follows: “adiabatic glass wool, continuous glass fiber, rock wool and residue cotton are now considered as non carcinogenic substances, belonging to three categories. (the World Health Organization’s International Cancer Research Institute classifies the carcinogenicity of substances into four categories: three categories of substances are insufficient evidence of carcinogenicity to human body.)
Post time: May-22-2020