Chemical and physical properties Properties Unit Specification SiO2 % = 85 - 97 Cl %
Silica fume, also known as microsilica, is an amorphous (non-crystalline) polymorph of silicon dioxide, silica. It is an ultrafine powder collected as a by-product during silicon and ferrosilicon alloy production. According to the SiO2 content, our products can arrange form grade 85% to grade 98%. According to the bulk density, we can divide our products into densified silica fume and undensified silica fume.
Microsilica/ silica fume manufacturer in China densified 85,92,95 and undensified 85,92,95
We can supply densified/undensified microsilica/silica fume product are with minimum SiO2 contents from 85% to 97%.
Good day. We can supply densified/undensified microsilica/silica fume product are with minimum SiO2 contents from 85% to 97%. Packing:1000kg/jumbo bag or as customer required. Attached our company profile and 92D microsilica Datasheets for your reference. while when you are in demand of microsilica, welcome to contact.
Silica fume, also known as condensed silica fume or microsilica, is a spherical sub-micron amorphous silicon dioxide used in many applications. Silica fume is a co-product of silicon or ferrosilicon production, consisting of ultrafine (sub-micron), amorphous, non-porous, perfectly spherical silicon dioxide (SiO2) particles, with purity levels of 85 to 99 %. The main effect of these ultra-fine particles is to greatly improve particle packing and produce a highly pozzolanic reaction in concrete and other cementitious bond systems where the silicon dioxide reacts with calcium hydroxide, heightening performance levels and the strength and durability of these materials. Additionally, silica fume, because of its amorphous (non-crystalline) structure and its specific area, provides other useful features to various applications, including improved sintering capabilities and enhanced high temperature performance of refractory castables, resulting in reactions between microsilica and other components of the refractory mix. To summarize, silica fume has two key features which alone or in combination are the basis for its high performance: The nano-sized spherical non-porous particles create an efficient "filler effect" Primary particles have an average diameter of about 0.15 �¼m (150 nanometers) Microsilica is a highly reactive form of silica producing a "chemical effect" Thanks to its amorphous nature and high specific surface area.
Microsilica (silica fume) is a byproduct from silicon metal or ferrosilicon industries
Microsilica (silica fume) is a by-product of silicon metal or ferrosilicon industries, is an amorphous silicon dioxide SiO2. This product reacts chemically with the calcium hydroxide in the cement paste which yields a calcium silicate hydrate gel that significantly enhances strength and durability. The super fine microsilica fills the voids between cement particles creating a very dense, less permeable concrete. Physical characteristics: Color: gray or gray white powder Bulk density: 320-700 kg/m3 Chemical composition: Items SiO2 Al2O3 Fe2O3 MgO CaO Na2O Moisture Content 75-98% 1.0-0.2% 0.9-0.3% 0.7-0.1% 0.3-0.1% 1.3-0.2% Fineness: the fineness of the silica fume is less than 1 1/4m, and the average particle size is 0.1 0.3 1/4m, and the specific surface area is 20 - 28 m2/g. The fineness and specific surface area are about 80-100 times of cement and 50-70 times of fly ash. Maxtech Micro Silica supplies will be as per QCS 2014 (ASTM C1240): SiO2: >/= 92% LOI:
Silica fume Analysisresult 900 (%)920 (%)940 (%)970 (%) Sio289.0292.0994.896.77 K2o1.321.120.630.26 Na2o0.520.420.350.29 Ph value8.187.786.607.10 Loi 750f¦1.801.600.900.80 Moisture content (when bagged) 0.41 0.400.430.41 Coarse particles:·+45 micron 64.732.6 Specific surface area (b.E.T.)1 8 m2/g19 m2/g19 m2/g19 m2/g Bulk density(kg/m3) 200~350 (900u)200~350 (920u)200~350 (940u) 500~600 (900d)500~600 (920d)200~350 (940u) 800kg/jumbo bag, 20'fcl contains 16 tons.
