Low density filler is a blended micro balloon based filler added to epoxy resin or hardener to make fairing putties that are easy to sand or carve. This epoxy filler is reasonably strong on a strength to weight basis.

Brand Name: West System
Sub Brand: 407 Filler
Adhesion Strength: Medium Strength
Material: Microfibers
Product Type: Fairing Filler
Container Size: 4 oz
UV Resistant: No
Packaging Type: Can
Color: Red / Brown
Solvent Resistant: No
Indoor or Outdoor: Indoor and Outdoor
Flammable: No
Full Cure Time: 15 hr
Recommended Surface: Wood and metal
Product Form: Powder
The filler is reasonably strong on a strength-to-weight basis. You can blend it into any WEST SYSTEM 105 Resin/20X Hardener combination, G/flex Epoxy 650, or G/5 Five-Minute Adhesive.