Peel Ply Explained and When to Use Each Style - Part 2

Sep 1st 2021

In Part 1 of this quick two part series we examined what peel ply is and its various characteristics. In Part 2 we’ll turn to some specific products and their uses.

Airtech Econostitch Peel Ply is made with budget in mind. The nylon material in the Econostitch allows for a service temp composite cure of 375 F. Designed for secondary bonding purposes, Econostitch peel ply ensures a slightly roughened surface on the top side of the laminate. Econostitch is made with red tracers to ensure that it is removed before secondary bonding processes are performed. Otherwise, the peel ply will be almost unnoticed in some fabrics once cured. It is mainly used in vacuum infusion processes but is also used in traditional layups and other vacuum assisted cures. When using a nylon-based peel ply without a Teflon or Silicone release coating, the peel ply may not peel up as easily after cure. Especially with uncoated peel plys such as this, extend surface of peel ply an inch or more beyond the fabric’s layup surface to peel them from the laminate effectively.

Airtech Bleeder Lease B is a nylon-based peel ply, however, equipped with a Silicone release agent coated onto the nylon fabric. Meaning that it is going to peel off the cured laminate much easier than a non-coated peel ply. The maximum temperature of 450 F makes this peel ply compatible with nearly all resin cure cycles. However, this peel ply should not be used with phenolic resins as the materials are not chemically compatible. With any coating on peel plys, the silicone could potentially transfer onto the laminate. Because the material is tightly woven, the surface finish of the Airtech Bleeder Lease B will be slightly smoother than that of most other porous peel plys, giving a finer texture.

Airtech Release Ease 234 TFP-1 is a fiberglass peel ply coated with Teflon. Teflon, in industry, is known for not sticking to anything! Likewise, the coating will ensure that the peel ply comes up easily while still providing the advantages of a porous system and working well in vacuum infusion and traditional processes. Service Temperature will exceed most all conventional resin cure cycles at 550F.

Non-Porous Teflon Coated Peel Ply is great for providing an almost unnoticeable imprint on the laminate surface once cured. As a non-porous type, it will retain all resin placed into it and will simplify vacuum bagging processes where breather and bleeding clothes are not used. This will be best when achieving a shiny surface finish to exhibit the composite’s fabric structure. It will also come of the parts easier than others. Stay away from this peel ply for resin infusion processes.