One-way breather membrane is NM breathable film of using the Special nanometer breathable materials and advanced production technology to form a high-tech gas-liquid separation film in the Substrate surface which can prevent the liquid through, but gas can through. This product is suitable for vacuum assisted resin infusion (VARl) allow the air to be evacuated continuously and keep the resin from losing. Recommend using the one-way breathable film in blade productive process.