I'll take a stab at this.
We recommend Hysol or other hi peel strength epoxy adhesives for Carbinge graphite hinges that we sell. Because only small volumes of this material are needed for our application, we have looked for and discovered alternatives for the quart cans of "Hysol of the week" sold by Lancair. It appears that over the years, the conglomerate Dexter Hysol has acquired most competitors and if you buy Loctite or Hysol materials they are all made by the same company or at least are all owned by the same corporation. We have seen at least three changes in the Hysol adhesives available from Lancair over the past ~20 years. Never an explanation, just a different product. I think that Hysol changes its formulae from time to time so that's what you get.
We now sell a Loctite product that comes in a 50 mm cartridge for use with a 2:1 ratio dispenser. This obviously wouldn't work well for wing closure but the lesson is that any formulation of adhesive that has similar chemical and physical characteristics is OK to use.
Sounds like you've done your homework and this product will work. Must be a HUGE wing to need six quarts? Make darn sure you don't use too much excess and plug the fuel ports in the wing bays. This has proven fatal for at least one pilot in the past.
John Barrett Leading Edge Composites Sent from my iPad
I am preparing to close a set of wings and have some questions about Hysol epoxy. I've reviewed previous posts and there hasn't been much said for awhile, perhaps because wings are coming from factory closed now.
I went to Aircraft Spruce and said "I need six quarts of Hysol." They sold me six quarts of Hysol. I used it to epoxy in a fuel drain and probe and was asked by Matthew Colliers why it wasn't blue. So, I looked closer at my manuals and saw that it calls for epoxy and flox if temperatures are below 70 degrees and Hysol 9339 if temperatures are above 70 degrees. I then went to the Lancair website and found they don't even carry Hysol 9339, but have changed to Hysol 9360. The product Aircraft Spruce sells is Hysol 9430. Lancair tech support says they don't know why 9360 is specified. "That was selected by the guy before me."
Aircraft Spruce says -
"This new and improved Hysol glue replaces the old EA-9410-2 glue. EA-9430 has the same characteristics as the EA-9410, but has a 50 minute pot life instead of the 30 minute pot life of the EA-9410 at 77°F. Used extensively in the Strojnik S2A sailplane and many other homebuilts."
Locktite tech support and the data sheets show the pot life, tensile and shear strenght to be almost identical. The one difference I can find is that the 9360 specifies shear at different temperatures while 9430 specifies the shear strenght only at 77 degrees. The guy from Locktite couldn't explain the differences, and said "they appear to be very similar products". Can anyone tell me what makes the 9360 product better suited for Lancair wings? Is there a reason not to use the six quarts of 9430 in my fridge? |
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