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Polyester + Epoxy Filler – Colloidal Silica 250gm
Colloidal Silica is a feather weight thixotropic powder, which is used to thicken resin & gelcoat and for bonding & filleting applications.
By adding colloidal silica powder in varying amounts to a resin mix containing the other filler types mentioned, the handling and flow characteristics can be controlled. Relatively small quantities added to a resin mix containing glass bubbles or microballoons will give non-sag properties and impart easier handling.
Colloidal 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 colloidal 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. For General Health Information see section on hazards.
Composition: Silicon dioxide / Appearance: White powder
Particle Size: 0.012 microns / Bulk Density: 50g/litre approx.
Colloidal Silica + Microballoons + 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
Epoxy Filler – Glass Bubbles 300gm
SP Glass Bubbles are hollow glass spheres with a more variable particle size than microballoons. Being composed chemically of glass, they are physically harder than microballoons and filled resin mixes are noticeably more difficult to sand. However, glass bubbles produce a more waterproof filler mix and are often used on below-waterline applications on boats. Being significantly less expensive than microballoons they are often preferred if easy sanding performance is not of prime importance. They can be mixed with microballoons in any proportion for colour purposes.
Composition: ‘C’ Glass
Appearance: White powder
Particle Size: 40 – 80 microns
Particle Density: 200g/litre approx.
Bulk Density: 100-150g/litre approx.
For General Health Information see section on hazards.