Fumed Silica Filler Powder
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Fumed Silica Filler Powder


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Quick Link Code:  QL8483
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Silica is an agent which is used to control the thixotropy or ‘sag’ characteristics of a resin system. By adding colloidal silica powder in varying amounts to a resin mix the handling and flow characteristics can be controlled. Relatively small quantities added to a resin mix containing glass bubbles or micro balloons will give non-sag properties and impart easier handling. Silica is also used with microfibres to produce a mix suitable for use as a high strength, non-sagging structural adhesive, particularly for non-absorbent materials such as grp. The inclusion of colloidal silica has the effect of increasing the hardness of the resulting mix which will create more difficulty when sanding. For this reason silica is usually added in the minimum quantities to any mix for which sanding is anticipated. In some applications this feature can be used to an advantage, for example to create a hard wearing edge or surface.

Specification
Property

   Condition 

Value Method
BET surface -  175 - 225 m²/g DIN ISO 9277 DIN 66132
Tamped density - approx. 40 g/l DIN EN ISO 787-11
pH⁽¹⁾ -  3.8 - 4.3 DIN EN ISO 787-9
Sieve residue⁽²⁾ - < 0.03 % DIN EN ISO 787-18
Loss on drying⁽³⁾ - < 1.5 % DIN EN ISO 787-2
1in 4 % dispersion (1 : 1 mixture of water-methanol)
2acc. to Mocker > 40 µm works (2 h at 105 °C)
General Characteristics
Property   Condition Value Method
Density⁽¹⁾ - 20 °C. 2.2 g/cm³ DIN 51757
INCI name - Silica -
Loss of weight⁽²⁾ - < 2 % DIN EN ISO 3262-19
Refraction index - 1.46 -
SiO₂ content⁽³⁾ - > 99.8 % DIN EN ISO 3262-19
Silanol group density - 2 SiOH/nm² -
1SiO₂ 2at 1000 °C / 2h (based on the substance dried at 105 °C for 2 h) 3based on the substance heated at 1000 °C for 2 h

These figures are only intended as a guide and should not be used in preparing specifications.

Colloidal Silica + Micro Balloons
+ Epoxy Resin
=

Fill / Fairing Mix
(Above Water)

Colloidal Silica + Glass Bubbles
+ Epoxy Resin
= Fill / Fairing Mix
(Below Water)
Colloidal Silica + Micro Fibres
+ Epoxy Resin
= Adhesive Mix
Colloidal Silica + Epoxy Resin = Thickened Resin Mix

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