Love the A-7 in your avatar! One of my favorite attack aircrafts,after the A6E.
One possably as to why is you have so much info and knowledge on adhesives. most of us grab epoxy at the hardware store and base our decision on,5 minute,10 minute overnight,clear or not,etc.....,with no thought whatsoever as to shear strength or any other quality. Epoxy is the stuff that works on ANYTHING,(to us). And we use "glue" to decribe any goop that hold's stuff together after it dries and you use adhesive. No disrespect is ment at all.
One's opinion of the A-6 variants changes according to how much time one has between or adjacent to the catapults ... when they come up to full power it's enough to rattle your eyeballs out.
"Glue" defines a polymer or homogeneous composition forming a polymer that is derived solely from natural materials.
"Adhesive" defines a synthetic polymer; a homogeneous composition that is comprised in whole or part of synthetic components; a heterogeneous mixture of natural and/or synthetic materials.
The common bottles of yellow and white and white liquids purchased at retail outlets people use for sticking substances like wood and paper together are not "glue", they are adhesives because they're synthetic PVAC (Polyvinyl Acetate). On the other hand, genuine "hide glue" and other homogeneous compositions coming solely from plants/animals are in fact "glues" but the likes of Elmer's, Titebond and such are "adhesives". The differences go far beyond just the correct terminology because all glues and adhesives have their own unique properties which is why I constantly stress the point that there is no one-size-fits-all magic bullet substance and anyone who claims such is a liar and anyone who believes such is either ignorant or a fool.
For example, one of the mfg's I deal with offers 137 varieties just in two-component polyepoxide materials. Of those 137 varieties, 44 have very different properties for use on specific substrates, 8 are compatible with wood substrates, 3 for softwoods and 5 for hardwoods. Of the 5 that are compatible with hardwoods, each has unique properties tailored for specific applications where three are made for different types of flexible joints and laminations while two are for different types of rigid/semi-rigid joints and laminations. If it were possible to have a one-size-fits-all product, why would this and other mfg's invest so much time and money into researching, testing and producing so many different products then putting more time and money into producing product spec' sheets and application guides for each particular product?
When you start adding components like fillers and reinforcing materials, the problems compound because now there's additional concerns not only with overall and bonding strengths and resin starvation but also with post-cure dimensional stability as well as static and dynamic stresses. It's no different than anything else, you can get away with doing things wrong only for so long until it bites you in the backside.
Mark
ATKRON 46
NAS Cecil Field
CVN-69
CV-67
