Products Information
Silica fume
Description
Silica fume is non-crystal fine powder of high-purity silicon dioxide (SiO2) obtainable in collected dust from Ferro Silicon, Silicon Metal and Fuzed Zirconia productions.
Application
(1) Concrete: Materials of reinforcing, increasing durability, improving workability for ultra-high-strength concrete, NATM shotcrete,
Glass Reinforced Concrete (GRC), grout material and plaster material
(2) Refractory: Improving fluidity, increasing strength and extending pot life of unshaped refractories (castable and spraying material)
(3) Building Material: Increasing bending strength for roofing tile and outside wall in order to displace asbestos
(4) Fertilizer: Preventing moisture absorption or agglomeration
(5) Resin: Increasing durability for vinyl chloride, increasing friction durability for shaped phenol resin
Grade List
Grade | SF-AN | SF-C | ||
---|---|---|---|---|
Origin | China | China | ||
Source | Fused Zirconia | Silicon Metal | Ferro Silicon | |
Content | JIS (JIS A 6207) |
Representative value | Representative value | |
Silicon dioxide (%) | 85.0 min. | 98.6 (Incl. ZrO) | 97.9 | 90.3 |
Magnesium oxide (%) | 5.0 max. | - | 0.26 | 1.15 |
Sulfur trioxide (%) | 3.0 max. | 0.05 | 0.79 | |
Volatile solids (%) | 4.0 max. | 0.46 | 1.6 | 2.5 |
Moisture (%) | 3.0 max. | 0.2 | 0.9 | 0.8 |
Chloride (%) | 0.1 max. | - | 0.01 | 0.03 |
pH | - | 2.5-3.5 | ≦7 | 8.0-9.0 |
Powder property | - | U | U/D | U/D |
Specific surface (BET method) |
15m2/g min. | 10.7 | 19.3 | 19.4 |
Suitable package | - | Big bag, Small bag | Big bag, Small bag |
**Powder property.
(1) U (Undensified powder): "U" has excellent dispersibility with 0.2-0.4g/cc of bulk density but requires careful handling due to its bulky volume
(2) D (Densified powder): "D" has good handling performance with 0.5-0.7g/cc but dispersibility is inferior to "U"
Features
(1) SF-AN: It is suitable for refractories owing to its stable acid pH with controllable pot life.Since its particle distribution (median size) is stable at around 1um, it has superior flowability.
(2) SF-C: Chinese silica fume available from various plants in China. Tomoe is able to choose suitable grades from reliable Chinese plants.
Inquiry
Industrial Materials Dept. Section-1
19F Osaki Bright Core,
5-15, Kitashinagawa 5-chome, Shinagawa-ku, Tokyo 141-0001, Japan
TEL:(3)3442-5145 FAX:(3)3442-5175