Colloidal Silica Filler Powder is a versatile premium material commonly used as a thickening and thixotropic agent in various resin systems. Creates a Bonding Paste and a Filler for Filleting and Fairing.

Suitable Resins

Polyester General Purpose Resin
Lloyds Approved Polyester Resin
Epoxy Resin Systems (West Epoxy)

Thixotropy refers to the property of a substance to become less viscous and more fluid when agitated or stressed, and then return to a higher viscosity when at rest. This property is valuable in controlling the flow and sag characteristics of a resin, ensuring it adheres well to vertical or overhead surfaces without running or dripping.

Thixotropy Control:

The addition of colloidal silica helps control thixotropy, preventing sagging or dripping of the resin. This is particularly important in applications where a uniform coating on vertical or overhead surfaces is desired.

Handling and Flow Characteristics:

By adjusting the amount of colloidal silica added to a resin mix, the handling and flow characteristics can be tailored to meet specific requirements. The inclusion of colloidal silica is especially beneficial when working with other fillers like glass bubbles or microballoons.

Non-Sag Properties:

When combined with glass bubbles or microfibers, colloidal silica imparts non-sag properties to the resin system. This is advantageous in applications where maintaining a specific shape or thickness is crucial.

Structural Adhesive:

Colloidal silica is often used in combination with microfibers to create high-strength, non-sagging structural adhesives. This is particularly useful for bonding non-absorbent materials like glass-reinforced plastics (GRP).

Increased Hardness:

The addition of colloidal silica to a resin mix tends to increase the hardness of the resulting material. While this can be beneficial for creating hard-wearing surfaces, it may also pose challenges during sanding due to the increased hardness.

Sanding Considerations:

Because colloidal silica can make the resin mix harder, it may create difficulties during the sanding process. To address this, colloidal silica is typically added in minimal quantities when sanding is anticipated. In some cases, the increased hardness can be intentionally used to create durable edges or surfaces.

In summary, colloidal silica is a valuable additive in resin systems, offering control over thixotropy, improved handling, and tailored flow characteristics. Its use is particularly beneficial in applications where non-sag properties, structural adhesion, and increased hardness are desired, though care should be taken to manage sanding challenges associated with higher hardness.

Shipping

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