<http://www.sweetcomposites.com/Fabric.html> ?towards the bottom of the page titles "Glass Finishes".
SWEET COMPOSITES 6211 RIDGE DRIVE, BETHESDA, MD 20816-2641 USA 301-229-2201 ? ? [9:00 a.m. to 5:00 p.m. ET] These guys are right down the road from you in Bethesda, MD, so you might want to stop by and talk to them in person. ?If you read my previous post, you would see that the sizing is cleaned from the cloth after weaving. ?Then the cloth is treated with Silane to enhance bonding with the glass resins. ?The Silane does have a shelf life which can be shorter or longer depending on the conditions of storage. This doesn't mean that you should toss out all your old glass cloth. ?But you might want to use something with a recent manufacture date if you are building a structural component. ?Strictly speaking, the majority of the glass work you will do on your KR is not structural. ?I wouldn't hesitate to use the older glass cloths for most of what we do. ?Most structural components in the KR are constructed of wood. ?Even the wing and tail surfaces are not really considered structural components as the load bearing is done with wood spars that are bonded to a wooden fuselage. Now, if you are doing something that's really a one off for a KR, like building your spars out of glass, then the age of the glass would be important. -Jeff Scott Los Alamos, NM > ----- Original Message ----- > From: Craig Williams > Sent: 03/28/13 02:41 PM > To: KRNet > Subject: KR> the aging of glass cloth > > Hmmm > > The discussion on glass cloth having a shelf life is interesting but I can > find no documentation that states that the sizing used on fiberglass products > has a shelf life.? If it were so, you would be able to find something about > it someplace.? If someone can point me to a manufacturers web page or a white > paper or something that says it's an issue I sure would be interested in > reading it.? Otherwise I say it's a myth. > > Craig > www.kr2seafury.com
