WEST SYSTEM Filler Selection Overview: Why are there so many? How do I choose?

WEST SYSTEM offers six different fillers—why so many? When is it critical to use a specific one? What are the differences? Let’s explore the details of WEST SYSTEM Fillers and discuss how they function. Understanding these products will enable you to take advantage of the versatility inherent in the WEST SYSTEM 105 Epoxy Resin System.

The primary purpose of all our fillers is to modify the viscosity of the liquid 105 Epoxy Resin and 200 series hardener mixture. Other properties, such as strength, density, and surface texture, are also affected when fillers are added. Having six fillers allows you to create a mixture with ideal properties for your application.

We discuss the four fillers used for structural bonding and then the two fillers for fairing. Structural fillers provide a strong mixture after they are cured, and it is important to note they are hard and difficult to sand. We do not recommend them for surface fairing and finishing. Fairing fillers, conversely, are much easier to sand and shape to a smooth finish but should not be used for highly loaded structural bonds.

To read the companion article, visit Epoxyworks.com:
https://www.epoxyworks.com/one-rotted...

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SHOP
https://www.westsystem.com/where-to-buy/

PRODUCTS USED
WEST SYSTEM 105 Epoxy Resin
https://www.westsystem.com/products/1...

WEST SYSTEM 205 Fast Hardener
https://www.westsystem.com/products/2...

WEST SYSTEM Fillers - All
https://www.westsystem.com/product-ca...

WEST SYSTEM 406 Colloidal Silica
https://www.westsystem.com/products/4...

WEST SYSTEM 403 Microfibers
https://www.westsystem.com/products/4...

WEST SYSTEM 405 Filleting Blend
https://www.westsystem.com/products/4...

WEST SYSTEM 404 High Density Filler
https://www.westsystem.com/products/4...

WEST SYSTEM 407 Low-Density Filler
https://www.westsystem.com/products/4...

WEST SYSTEM 410 Microlight Filler
https://www.westsystem.com/products/4...

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MORE INFORMATION
Full Epoxyworks article on filler selection
https://www.epoxyworks.com/one-rotted...

Epoxy Use Basics
https://www.westsystem.com/instructio...

Adding Fillers
https://www.westsystem.com/instructio...

Epoxy Safety
https://www.westsystem.com/safety/pre...

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CHAPTER MARKERS
00:00 Intro
02:43 Consistencies
04:07 406 Colloidal Silica Filler
05:50 403 Microfibers Filler
07:16 405 Filleting Blend Filler
07:56 404 High-Density Filler
09:23 407 Low-Density Filler
10:52 410 Microlight Filler