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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
Talc is the major component of any body filler. #1131 is a sandable filler added for fairing and smoothing the finish of fiberglass laminations. The recommended filler ratio is 2 parts #1131 to 1 part resin to result in a smooth, creamy semi-paste. The exact filler portion will vary by application depending on the desired consistency. Allow to stand one hour before adding hardener and using.  
Glass Microspheres
These hollow glass spheres make a lightweight sandable filler when blended with resin. Use to fill fabric weave, shallow blisters and surfaces of core materials. The average bubble is less than 70 microns, about a quarter of a grain of salt. It is this small particle size which makes the paste so easy to spread evenly.

Particle sizes range from 30-105 microns. 
Thixotropic Silica
#23 is a fine grade fumed silica thickening agent similar to Cab-O-Sil and is added to resin systems to prevent run-off and sags on vertical surfaces. Mix in the ratio of 1 part by volume #23 to 2 parts resin for general use.

Cab-O-Sil is a registered trademark of Cabot Corporation. 
1/4
These longer glass fibers are used to increase tensile and compressive properties of any resin, even concrete. This coarse mixture can strengthen castings and reinforce fillets in difficult to laminate areas of parts.   
1/32 inch Milled Glass Fibers
#38 features 16 micron fibers and is similar to #29. The shorter fiber improves finishing characteristics for surface applications. Great to reinforce detailed castings, or blend with epoxy to make a tough outer surfacing coat.

1/32" refers to the hole diameter of the hammermill screens used to mill the fibers. Fiber lengths vary from small particulates up to the screen opening dimension. Both fiber length and bulk density are controlled by the screen size.   
1/16 inch Milled Glass Fibers
These short fibers offer high strength results! Mix with any body filler or casting material to increase strength and reduce shrinkage. Blend with vinyl ester resin to create a strong and corrosion resistant blister repair putty for deeper hull damage, or blend with any of our resins to create a high strength repair. Mix to a ketchup consistency for best corrosion protection.

1/16" refers to the hole diameter of the hammermill screens used to mill the fibers. Fiber lengths vary from small particulates up to the screen opening dimension. Both fiber length and bulk density are controlled by the screen size.   
1/4
These precision chopped graphite fibers offer an economical alternative for localized reinforcement of high performance parts requiring optimal electrical conductivity, high strength and moduli. Excellent for reducing voids in difficult vacuum bagging applications. Spread the filler in deep cavities or sharp edges of parts and be assured the pressure will squeeze out air.  
Kevlar® Pulp
Kevlar® pulp is the lightest of the fillers and highly abrasion resistant. Areas of high impact can easily be reinforced 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.  

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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