West System 406-7 Collodial Silica 5.5oz, off-white

Description

Product Overview

West System 406-7 Colloidal Silica is a high‑quality, off‑white epoxy thickening additive formulated to give you precise control over the viscosity of epoxy systems used in tile installations and other demanding applications. Packaged in a convenient 5.5 oz (155 g) container, this product is engineered to integrate seamlessly with West System epoxy resins, providing a reliable solution for both professional contractors and serious DIY enthusiasts. The colloidal silica particles are uniformly dispersed, ensuring consistent thickening performance without introducing air bubbles or compromising the clarity of the cured epoxy. This additive is especially valuable when working on vertical or overhead joints where runoff can be a major issue, as it helps the epoxy stay in place until it fully cures. In addition to its thickening capabilities, the silica enhances the mechanical properties of the cured epoxy, delivering improved abrasion resistance, higher tensile strength, and better overall durability. The product dimensions of 21 × 16 × 11.25 inches make it easy to store in a workshop, and the off‑white cured color blends well with most tile epoxy formulations, minimizing visual impact on finished surfaces.

Usage

This thickening additive is designed for a wide range of tile epoxy applications, including floor and wall tile installations, grout sealing, and decorative epoxy coatings. To achieve optimal results, mix the colloidal silica into the epoxy resin at the recommended ratio of 1 % to 5 % by weight, depending on the desired viscosity and the specific demands of the project. For vertical joints, a higher percentage (around 3‑5 %) is often recommended to prevent sagging and runoff, while for horizontal applications a lower dosage (1‑2 %) may be sufficient to achieve a smooth, level finish. The additive can also be used in combination with epoxy fairing compounds to improve their workability and strength, making it an excellent choice for repairing damaged tiles or filling gaps. Because the silica is chemically inert, it does not interfere with the curing process of the epoxy, allowing the system to reach its full mechanical performance. The product is suitable for both indoor and outdoor environments, provided the epoxy resin itself is rated for the intended exposure conditions. When used in marine or high‑humidity settings, the thickening additive helps maintain a consistent bond, reducing the risk of delamination or moisture ingress.

Why Choose Us

Choosing West System 406-7 Colloidal Silica means selecting a product backed by decades of expertise in marine‑grade epoxy technology. West System is a trusted brand known for rigorous quality control, and this additive benefits from the same manufacturing standards that have earned the company a reputation for reliability and performance. The colloidal silica is produced using a proprietary process that ensures particle size uniformity, which translates into predictable thickening behavior and superior finish quality. Our customers appreciate the consistency of the product, which reduces the need for trial‑and‑error adjustments on the job site. In addition, the additive is packaged in a resealable container that protects the material from moisture and contamination, extending its shelf life when stored properly. We also provide comprehensive technical support, including formulation guidelines, troubleshooting assistance, and application tips, ensuring that you have the resources needed to achieve professional results every time. With a 4.9‑star rating from over 80 verified reviews, the product has demonstrated its value across a broad spectrum of users, from seasoned contractors to hobbyist makers.

Key Features

• Provides precise viscosity control for vertical and overhead epoxy applications
• Improves abrasion resistance and tensile strength of cured epoxy systems
• Prevents epoxy runoff, reducing waste and ensuring clean joint lines
• Compatible with all West System epoxy resins and many third‑party formulations
• Backed by expert technical support and a trusted brand reputation

FAQ

What is the recommended mixing ratio for 406-7 Colloidal Silica?

The typical dosage is 1‑5 % by weight of the epoxy resin. For vertical joints, aim for 3‑5 % to prevent sagging; for horizontal surfaces, 1‑2 % is usually sufficient.

Can I use this additive with epoxy products from other manufacturers?

Yes, the colloidal silica is chemically inert and works well with most standard epoxy resins, though we recommend testing a small batch to confirm compatibility.

Does the additive affect the curing time of the epoxy?

No. The silica does not interfere with the epoxy’s cure schedule, so the system will reach its full strength at the same rate as the base resin.

Is the product safe to handle?

When used as directed, the additive is non‑hazardous. However, it is advisable to wear gloves and eye protection to avoid skin or eye irritation, especially when handling large quantities.

How should I store any remaining product?

Keep the container tightly sealed in a cool, dry place away from direct sunlight. Proper storage will maintain the additive’s performance for up to two years.