Specifications

Micro silica powder 91# powder
SiO2: 85%-98%
LOI: 2%MAX
PAI: 110%Min
Micro silica powder is widely used in many fields

Microsilica powder  91# is a very fine pozzolanic material, composed of amorphous silica produced by electric arc furnaces as a byproduct of the production of elemental silicon or ferro silicon alloys. Microsilica is also called as silica fume, fumed silica, silica dust, which is widely used in concretes field and refractorys field. The microsilica used in refractory has a minimum of 92% content of silica, the average content of SiO2 is around 93%.And this densified microsilica reaches national first grade standard,80% of granularity is less than 0.1 um with a maximum of 0.3 um.

 

Application in refractory

Microsilica in refractory is a highly effective pozzolanic material, the functions of adding microsilica are as follow:

1) enhancing the fluid of pouring refractory

2) reducing the volume of used water

3) be easy to shape

4) raising the production efficiency

5) microstructure for gap filling

6) rising the compact and intensity of refractory

7) enhance elevated temperature strength and thermal shock of refractory.

8) minimizes rebound loss

 

3.Spec.

1)Specification-Building Grade

Analysis	Result	Result	Result	Result	Result
	SF85	SF88	SF90	SF92	SF94
SiO2(%)(min.)	85.05	88.05	90.05	92.05	94.05
Fe2O3(%)	0.78	0.44	0.21	0.25	0.20
Al2O3(%)	0.29	0.20	0.21	0.25	0.20
CaO(%)	0.39	0.31	0.31	0.36	0.21
K2O+ Na2O (%)	0.29	0.24	0.22	0.20	0.20
Moisture(%)	3.05	2.55	2.05	2.05	1.03
Loss on Ignition (L.O.I) @975OC(%)	3.38	3.10	2.38	1.75	1.50
Bulk Density (kg/m³)	500-700	500-700	500-700	500-700	500-700

 

 

2)Specification-Refractory Grade

Analysis	Result	Result	Result	Result	Result
	SF94	SF95	SF96	SF97	SF98
SiO2(%)Min	94.50	95.50	96.50	97.10	98.1
Fe2O3(%)Max	0.25	0.23	0.2	0.1	0.7
Al2O3(%)Max	0.25	0.22	0.2	0.1	0.7
CaO(%)Max	0.35	0.30	0.25	0.15	0.11
Na2O + K2O(%)Max	0.3	0.28	0.25	0.15	0.09
Moisture(%)Max	1.75	1.45	1.1	0.8	0.65
Loss on Ignition	1.65	1.55	1.45	1.30	1.02
Bulk Density (kg/m3)	200-350	200-350	200-350	200-350	200-350

 

4. Packing: Building Grade: 900kg/bag or as per customer’s request

                  Refractory Grade: 500kg/bag, 2 bags with one pallet.

 

5. Capacity: Building Grade: 18-20 MT into one 20 FCL.

                   Refractory Grade: 20MT into one 40HQ.

 

6. Delivery Time: 3 weeks after payment.