Dynel and Peel Ply

DYNELFabrics made from woven polyester fibre are known as Dynel. They are used for laminates requiring high impact resistance. It does well for this task because Dynel is "strechy" enabling it to strech and rebound to absorb the impact. It is the best material of all in this respect, and also Dynel is the lightest of the fibre reinforcing materials. It is how-ever a "limp" material and as a result polyester fibre reinforced laminates lack stiffness. Dynel is thus not suitable for mouldings which need to be rigid.

PEEL PLY This is a tightly woven polyester material treated so that the resin does not adhere to it. Once the rersin and the glass are applied to the surface, peel ply is laid over and squeegeed down so that excess resin soaks up throughh the cloth. After the resin has set, the peel ply is pulled off, removing the excess resin and leaving a good rebondable surface which requires no additional preparation for the next coat.

That is very important, however, the peel ply serves other important functions as well. When applied over the wet lay-ups, you have a surface that will allow you to squeegee trapped air out without allowing the glass layers to move and shift around. When the resin/fiberglass layup is cured and the peel ply is removed, the surface will be free of harmful sharp edges and spurs. Peel ply can help ensure that the minimum resin that is required to properly wet out and bond the reinforcing fibres is all that remains after the peel ply is removed.

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