Tomoe Engineering Co., Ltd.

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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
*Above data are typical values.
**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

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