The WEST SYSTEM 407 Low-Density Filler data sheet details its properties, mixing guidelines, and recommended filler quantities.
The 407 Low-Density Filler is a blended microballoon‑based filler used to make fairing putties that are easy to sand or carve. It provides a reasonable strength‑to‑weight ratio and cures to a dark red/brown color. The filler is added to epoxy resin/hardener mixtures to achieve the desired consistency for various applications.
The sheet includes a guide for selecting filler consistency, showing how the amount of filler controls mixture thickness. A chart gives typical properties for cured epoxy at different consistencies (e.g., Shore D hardness 63, compression strength 2,900 psi, density 35 lb/ft³) and lists the quantities of filler needed for each package size. A filler selection guide ranks the 407 among other WEST SYSTEM fillers for uses such as bonding, fairing, and laminating.
| Shore D Hardness | 63 |
|---|---|
| Compression Strength | 2,900 psi |
| Density | 35 lbs/ft³ |
| Cure Color | dark red/brown |
It cures to a dark red/brown color.