Silica Fume

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Description

GNPGraystar’s Silica Fume is an undensified, amorphous ligh gray silicon dioxide powder with low impurity levels and a constant pH.

This material data has been provided by GNPGraystar Specialty Materials.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

General

PropertyValueComment

Bulk density

0.304 g/cm³

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Loss on Ignition

1.7 %

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max. (970°C/1 hrs)

Specific surface area

20.5 m²/g

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BET

Water content

0.3 %

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pH Value

7.5 [-]

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Chemical properties

PropertyValueComment

Aluminium

0.11

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Al₂O₃

Calcium

0.42

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max. CaO

Carbon

1.1 %

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free carbon

Chlorine

0.0095

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Iron

0.08

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Fe₂O₃

Magnesium

0.29 %

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Potassium

0.38

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K₂O

Silicon

96 %

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SiO₂

0.12 %

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free silicon

Sodium

0.06 %

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Na₂O

Sulfur

0.01 %

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SO₂

Technological properties

Property
Application areas

GNPGraystar’s Silica Fume is perfect for use in refractory castables, including low and medium cement, vibratables, and self-flow castables. Use of Silica Fume improves the mechanical properties (MOR, CCS, creep,etc.) of castables by acting as a flow agent of water required to place refractory castable mix.

Other

> 45 microns: 2.2 %

Brightness: 47