90U Undensified Silica Fume

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90U Undensified Silica Fume

Product name: Silica Fume / Microsilica Grade 90

Silica fume, a co-product from the production of silicon or ferrosilicon metal, is an amorphous silicon dioxide – SiO2 which is generated as a gas in submerged electrical arc furnaces during the reduction of very pure quartz.  This gas vapor is condensed in bag house collectors as very fine powder of spherical particles that average 0.1 to 0.3 microns in diameter with a surface area of 17 to 30 m2/g.  Silica fume is used in a variety of cementitious (concrete, grouts and mortars), refractory, elastomer and polymer applications.


1. Chemical Component  (weight%)

Element                            Specification                            Typical value

SiO2:  %                                  90min                                           92.5

Chlorides: %                            0.1max                                         0.05

Al2O3: %                                 0.5max                                         0.26

Fe2O3: %                                0.1max                                         0.08

K2O: %                                    2.0max                                         1.25

MaO: %                                   1.0max                                          0.88

C:  %                                        2.0max                                         1.53

Na2O: %                                  1.0max                                         0.43

CaO: %                                    1.0max                                         0.66

MgO: %                                    1.0max                                        0.56

SiC: %                                      2.0max                                        1.15

H2O: %                                    1.0max                                        0.68

Phisical data

Properties                  Specification                     Typical value

Loss on Ignition%                     1.5max                                        2.3

Coarse particles                       5.0max                                        2.5

> 45um %

PH- Value                                  9max                                           7

Bulk density:kg/m3                   330max                                        260

The above typical value is just for reference.

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.

85% Undensified Silica Fume