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Fillers

When mixed as part of a body filler or resin, these small particles serve a number of purposes for composite laminates. Fillers are used to reinforce strength or fill gaps in targeted areas, like fabric weave, butt joints, and the surface of core materials. They can also be used to improve surfacing characteristics, like sanding, and can be added to resin to prevent run-off or sagging in vertical applications.

No matter how they are used, fillers should be handled carefully due to their especially small size. When mixing, take special measure to avoid "dust" and direct contact with skin and eyes. When storing, fillers should be sealed tightly against moisture, heat, and general contamination.

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Talc
Cost-Effective Surfacing Filler


Talc is a component in most body fillers, and is often added for fairing and smoothing the finish of fiberglass laminations. It provides a unique balance of opacity, film reinforcement, and both anti-cracking and barrier properties as part of a surface layer.

This filler is compatible with epoxy, polyester, and vinyl ester resin systems.

Mix ratio is 2:1 (filler to resin by volume).  
Glass Microspheres
Lightweight, Sandable Filler


When blended with resin, these hollow glass spheres make a lightweight, sandable filler, perfect for filling in fabric weave, shallow blisters, and the surfaces of core materials. The average bubble is less than 70 microns, about a quarter of a grain of salt. Select this unique size and shape for a variety of reasons:
  • Tiny spheres blend readily for an evenly spreadable paste.
  • They're adaptable to a variety of production processes such as spraying, casting, and molding.
  • Low density reduces weight, lowers costs, and enhances properties for finished parts.
  • Spheres provide lower viscosity and improved flow, and reduce shrinkage and warp.


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

Mix ratio is 3:1 (filler to resin by volume).  
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. 
1/4
Build Strength for Resin Systems


These longer glass fibers are used to increase tensile and compressive properties of any resin, and even other traditional building materials including concrete. Fibers will strengthen castings and reinforce fillets in difficult-to-laminate areas of parts like edges and corners.
  • Cut costs for processing, without compromising strength.
  • Good color characteristics permit pigmentation or color matching to specification.
  • Superior strand integrity resists generation of fuzz when used in feeding systems.
  • Fabricators often add other fillers, like our #23 Silica, to resin in conjunction with chopped glass for handling.


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

Mix ratio is 1:15 (filler to resin). 
1/32 inch Milled Glass Fibers
Small Fibers for High-Strength Parts


This milled glass fiber features smaller 16 micron fibers when compared to our 1/16" milled glass, #29, but embodies similar properties. Mix this milled glass with any resin, body filler, or casting material to increase strength and dimensional stability for parts.
  • Milled glass helps reduce shrinkage and increase moduli for parts, so it's popular for electrical/automotive components.
  • These tiny fibers, when mixed thoroughly, minimize clumping.


Both fiber length and bulk density are controlled by the screen size—1/32" refers to the hole diameter of the hammermill screens used to mill the fibers, and lengths may vary up to this dimension.

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

Add fibers to resin 5% by weight. 
1/16 inch Milled Glass Fibers
Short Fibers with High-Strength Results


Mix this milled glass with any resin, body filler, or casting material to increase strength, bulk, and dimensional stability for parts.
  • Milled glass helps reduce shrinkage and increase moduli for parts, so it's popular for electrical/automotive components.
  • It is often used with vinyl ester resin as a corrosion-resistant, blister repair putty for deep boat hull damage (a ketchup consistency delivers best results).
  • Both fiber length and bulk density are controlled by the screen size—1/16" refers to the hole diameter of the hammermill screens used to mill the fibers, and lengths may vary up to this dimension.


For similar properties, but smaller fibers, see the 1/32" Milled Glass Fiber, #38.

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

Add fibers to resin 5% by weight. 
1/4
Get Localized Strength for High-Performance Parts


Use precision-chopped graphite fibers to reinforce parts requiring optimized electrical conductivity, high strength, and modulus.
  • Use with difficult vacuum bagging applications to fill deep cavities or sharp edges.
  • Chopped fiber is an economical alternative to fabric.
  • Chopped graphite fiber also offers good translation of mechanical and electrical properties and is easily mixed into a uniform pre-blend prior to compounding.


Recommended for use with epoxy or vinyl ester resin. Add filler after adding catalyst to resin.

Mix ratio is 1:15 (filler to resin). Adjustments may be necessary by application. 
Kevlar<sup>®</sup> Pulp
Reinforce High-Impact Areas


Kevlar® Pulp is the lightest of the fillers and highly abrasion resistant. Areas of high impact can be reinforced easily with this strong and durable material. Also, use it to make beveled fillets along edges of honeycomb cores to smooth the transition of fabric skins.

Recommended for use with epoxy or vinyl ester resin. Add filler after adding catalyst to resin.

Mix ratio is 1:15 (pulp to resin). 

You can place your order on our website or, if you have any questions, call 1.800.838.8984 | 8:00am - 8:00pm EST Mon-Fri.


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Fibre Glast Development Corp.
385 Carr Drive
Brookville, OH 45309
Phone: 800-838-8984
Fax: 937-833-6555
Email: customerservice@fibreglast.com

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