By Kacordy - 9/22/2020 4:35:13 PM
I would like to try MTI hose. Out of curiosity I took a 2 foot section of MTI hose, added an elbow at one end, sealed it with yellow sealant tape, at the open end I wrapped and sealed it with sealant tape, then applied vacuum. The MTI Hose holds at 20 very well. I thought the white covering was supposed to be porous and let the gasses seep through while blocking the resin? I’m I supposed to take a fine needle and poke holes through the membrane to get it to work? Thanks, Allen
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By DD-Compound - 9/24/2020 7:36:16 AM
Hello,
with a short piece of MTI the airflow is restricted quite a lot so you will always see high numbers at the gauge when pulling vacuum. The 20 inch HG means it still lets air pass. I am wondering it holds the 20inch when you shut the pump off or clamp the vac line.
What you should do is pull vacuum and fold the vac line, you will the the vacuum in the MTI hose will be gone immediately because the air goes into the MTI hose. The prosity is big enough for infusion. Often people are worried that the airflow is not big enough but it only slows down the evacuation time. During infusion there is vacuum and only the air out of the resin that is little degassing has to be evacuated. The porosity is always big enough for that. The MTI hose is used to infuse 85m wind blades so it works, don't worry.
By the way it is interesting thet German Advanced Composites has copied our clamps and sells them unautorized and under our name and brand.
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