Perforated Isolation Membrane

Perforated Isolation Membrane (also known as perforated release film or hole film) is a non-porous fluoropolymer or polyolefin film with strategically spaced perforations. Used in vacuum bagging systems, this membrane allows trapped air, gases, and excess resin to escape through the holes while acting as a barrier that prevents liquid resin from migrating into the breather fabric above. It creates a clean separation between the laminate and the breather/bleeder layers, ensuring efficient resin management and void-free cured parts.

Do:

• Place perforated membrane directly on top of the laminate (or on top of release fabric if used)

• Ensure perforated side faces the laminate (hole pattern typically designed for downward resin flow)

• Overlap edges by 5–10cm when using multiple pieces

• Use with appropriate breather/bleeder fabric on top

• Check that perforations are clean and open before use

❌ Don’t:

• Use with low-viscosity resins without testing (very thin resins may pass through perforations)

• Exceed temperature rating of the membrane

• Stretch or tear the film during application

• Reuse perforated membrane – holes may clog with cured resin