Fillers help expand epoxy's versatility by altering its consistency for specific applications. Each filler possesses a unique set of physical characteristics, but they can be generally categorised as either Adhesive (high density) or Fairing (low density).
Adhesive filler mixtures cure to a strong, hard-to-sand plastic suitable for structural applications like bonding, filleting and hardware bonding. Fairing filler mixtures cure to a light, easily sandable material that is generally used for cosmetic or surface applications like shaping, filling and fairing.
In some cases, ATL Composites supplies alternative fillers to those listed in the WEST SYSTEM User Manual.
413 Microfibre Blend is a high density filler used to create a multi-purpose, high strength adhesive used for structural applications like bonding, filleting and hardware bonding, while retaining excellent wetting and penetrating capabilities. As a blended filler, 413 Microfibre Blend, offers an added degree of thixotrophy and substantially improved spreading and working properties.
411 Microsphere Blend is a low density filler which cures to a lightweight filling putty with excellent filleting characteristics. 411 Microsphere Blend is also used as a low density adhesive for edge gluing in strip plank construction.
410 Microlight is the ideal low-density filler for creating a light, easily-worked fairing compound especially suited for cosmetic or surface applications like shaping, filling or fairing. 410 Microlight mixes to a very smooth creamy texture that can be trowelled to a feather edge, and is less porous than other filling compounds
417 is a low density microballoon-based filler used as a thickening agent with epoxy fairing systems to make fairing putties that are easy to sand or carve. 417 has a reasonably strong strength to weight ratio, and is recommended as the preferred filler under dark coloured surfaces.
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