Monthly Archives: September 2016

  1. Vinyl Ester and Epoxy Resin

    Vinyl Ester Resin

    Vinyl ester resins and polyester resins are very close in molecular composition.  The molecular chain is longer in Vinyl ester resin.  This helps it absorb impact better than polyester and it shrinks less.  There is also less chance of de-lamination when using VE resin.  Vinyl ester can be used as a final coat after polyester resin to create a better water barrier.

    Vinyl Ester resin is also more resistant to solvents and water degradation.  It is typically used in gas tanks, boat hulls and other items that will be exposed to chemicals or water for extended periods of time.

    VE resin is a tougher resin because

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  2. Fiberglass Fillers

    Fillers are often added to resin to make a putty.  One filler can be added or several depending on what outcome is desired. Fillers can reduce or increase weight, improve sanding properties, prevent sag on vertical surfaces, fill gaps in fabric weave, improve bonding properties, add strength etc. It is important that the user experiment on a small area before using on a project.  Fillers are added after the catalyst when used with resins.

    Milled fibers come in a variety of lengths such as 1/32", 1/8" and 1/4".   They are glass filaments coated with a specific sizing to enhance resin compatibility

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  3. Polyester Resin

    Fiberglass Warehouse is a Polyester Resins online store. Polyester resins are comes from synthetic resins. Polyester Resins mostly use at mortar toppings.

    To make a durable composite laminate you need to have both a reinforcement (fiberglass cloth, fiberglass mat, carbon fiber, aramid, etc.) and a resin.  Resin holds the reinforcement together and helps it conform to the wanted shape.  Resin fills the fiberglass weave. Just like there are several reinforcement options there are also a few resin options.

    The most commonly used resin is polyester.  It is more economical

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  4. Woven Roving and Knitted Fabric

    Woven Roving

    Woven roving is a great option to use in boat building, especially when used with chopped strand mat. Woven roving is a heavy, coarse plain weave cloth. Bundles of roving are woven together loosely at 90 degrees. It comes in 18 and 24 oz weights. (We only sell the 24 oz woven roving by the yard).

    Woven roving is used to quickly build up thickness. The continuous filaments add strength. A drawback is that with the woven bundles there is crimping. The crimp points can fracture.

    Typically when using woven roving, it is alternately layered with chopped strand mat. The reason to use mat with roving is because of the

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