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Thixotropic Silica

Thixotropic Silica
Prevent Sags on Vertical Surfaces


A white, free-flowing powder, Thixotropic Silica is a thickening agent primarily added to resin to prevent run-off and sags on vertical surfaces.
  • Use with an epoxy to produce extremely hard, solid parts, perfect for structural bonding, filling, and filleting.
  • Use in conjunction with chopped glass fiber for added strength for parts.
  • Silica-filled resin can be difficult to sand. Consider using #22 Glass Microspheres for areas that require sanding.


This filler is compatible with epoxy, polyester, and vinyl ester resin systems. Add filler after adding catalyst to resin.

Mix ratio is 1:2 (filler to resin by volume) for general use, 1:3 (filler to resin by volume) to reduce runs/sagging.






Description Item # Price Qty
1/2 Gallon (6 oz) 23-A $9.95
Carton (7 lbs) 23-C $129.95
Bag (30 lbs) 23-D $449.95




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