The color of the silica fume is roughly divided into three kinds: black, gray, gray-white. There are many factors that cause the different color of micro silica fume. The color of micro silica fume is different by different smelting recipes and raw materials. However, the content of silicon will not change much, mainly due to the different content of other substances, which causes color change.
Application of black silica fume
In the field of oil cementing, black micro silica fume has more special role. During the process of oil mining, the temperature of the superheated steam in the injection formation is up to 300 degrees. At such high temperature, the strength of the ordinary portland cement will decline sharply. Therefore, adding micro silica fume into cement can effectively improve the thermal stability of cement. Because black silica fume contains a lot of high purity silica, it is more suitable for high temperature applications.
The black silica fume has higher purity silica, because of its high purity silicon dioxide, so it has higher activity and is suitable for high temperature and high strength concrete. Black micro silica fume can also be used in ordinary concrete to significantly increase the strength and significantly increase the durability and reduce cost.
Black microsilica Technical Data:
| Index items | Standard Value |
| SiO2(Silicon Dioxide) | Min. 96.0% |
| Fe2O3 (Iron Oxide) | Max. 0.3% |
| Al2O3(Aluminium Oxide) | Max. 0.5% |
| CaO(Calcium Oxide) | Max. 0.4% |
| MgO(Magnesium Oxide) | Max. 0.5% |
| K2O(Potassium Oxide) | Max. 1.0% |
| Na2O(Sodium Oxide) | Max. 0.4% |
| Moisture Content(H2O) | Max. 1.0% |
| Loss on Ignition(L.O.I) | Max. 1.5% |
| Percent Retained On 45μm (325 sieve) | Max. 1.0% |
| Bulk Density | 320-360kg/m3 and 630-680kg/m3 |
Packaging & Delivery
10kg soluble paper bags x 84 on the pallets.
20kg soluble paper bags x 42 on the pallets.
950kg plastic woven bags x 2 on the pallets(with or without bottom output )
1000kg plastic woven bags x 2 on the pallets(with or without bottom output )
500kg plastic woven bags x 2 on the pallets (with or without bottom output )
We can also produce according to your requirement.
