Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by Cisnerjo

  1. Cisnerjo

    Low Barcol Hardness Readings after switching materials (Phenolic Prepregs 270°F cure)

    Thanks for you feedback I appreciate your reply Compositepro. After samples were cured, we performed some post cure on them in order to validate if Barcol Hardness got improved somehow. unfortunately, they decreased a bit compared with the ones obtained after regular cure. For now, we are...
  2. Cisnerjo

    Low Barcol Hardness Readings after switching materials (Phenolic Prepregs 270°F cure)

    Hi SWComposites thanks a lot for you reply and feedback. Actually, Manufacturer does not mention any specific readings for Barcol Hardness we are using our own specification as based line, but unfortunately readings we were getting with old material are not the same for the new one. Barcol...
  3. Cisnerjo

    Low Barcol Hardness Readings after switching materials (Phenolic Prepregs 270°F cure)

    Hello everyone, I would like to request support from the experts on this matter. We are switching from certain phenolic prepreg to a different one available from same manufacturer which mentions both are the same. We perform Hardness test per our own specification which request an average of...
  4. Cisnerjo

    Plaster Mandrels alternative materials for washout mandrels (fiber glass air ducts)

    Thanks a lot for your response and support ! SWComposites
  5. Cisnerjo

    Plaster Mandrels alternative materials for washout mandrels (fiber glass air ducts)

    Hello, Composite experts community, I would like to request your expertise in order to look for an alternate material to make mandrels used for aircraft ducting. Right now, we are producing this mandrel using a plaster type material which it works for the type of duct we are currently producing...
  6. Cisnerjo

    When to use a N4 or N10 air breather

    Hello Everyone, I'll like to ask your support based on your expertise on Composites. I would like to know when I should use a N4 Breather or N10 breather for bagging and curing purposes. At the moment we use N10 Breather on parts made of Epoxy prepreg cured on the oven under vacuum of 22"Hg up...
  7. Cisnerjo

    Drum Peel Test Coupon (sandwich)

    Hello SWComposites, in regards of standardize the procedure is something we are working at the moment. The configuration hasn't been changed except for the new requirements from out customer. Which increased the requirements. we don't use any adhesive at all there are placed two plies of prepreg...
  8. Cisnerjo

    Drum Peel Test Coupon (sandwich)

    Hello, We are experiencing some low results on our mechanical drum peel test coupon, our drum peel test coupon is made using two plies of epoxy prepreg (7781 style fabric) on each side of the core which is .210" thick. We noticed production people uses several ways to build them, customer...
  9. Cisnerjo

    Composite Part Stuck to a Mold

    Finally was able to removed it from the layup tool. Hope this helps to someone else in the future, placed several shims around the radome periphery placed a generous amount of release agent let it set for 20 minutes then removed all shims and placed the tool on the oven at 170°F for 30 minutes...
  10. Cisnerjo

    Composite Part Stuck to a Mold

    SWComposites, the part it gets Autoclave cured with 20psi of pressure and cure at 260°F, do you think if we apply the same amount of heat could help some how or 150°F should fine?
  11. Cisnerjo

    Composite Part Stuck to a Mold

    Thanks, Its a fiber glass tool.
  12. Cisnerjo

    Composite Part Stuck to a Mold

    I already inserted some wedges and poured an small amount of release agent Frekote, will leave it on it for 15 more minutes in order to attempt to get as much release as needed all the way to the bottom, then will follow your recommendations by removing the wedges and will put it on the oven at...
  13. Cisnerjo

    Composite Part Stuck to a Mold

    Hello SWComposites thanks a lot for your reply Its a radome and its made with Epoxy prepreg and foam core. the edge band is a solid laminate area but the rest of the part is foam core covered by 4 plies of prepreg on each side (tool and bag side)
  14. Cisnerjo

    Composite Part Stuck to a Mold

    Hello everyone, I have a problem with a part, it got stuck to the mold tool, there were 17 cycles already performed on it (applying 2 coats of release each time) so it started to build some resin on the surface, so I lightly buffed it down with a scotch brite and re-apply one coat of release but...
  15. Cisnerjo

    Autoclave Bag Leak

    My bad SWComposites sorry for not answer about the NDT Ultrasonic, we dont perform Ultrasonic test but we do perform a Thermography Test on parts the one mentioned with the issue did not presented any delamination or porosity indication at all. Thank you very much for all your support !!
See more

Part and Inventory Search

Back
Top