wrote: > 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 aw= hile, perhaps because wings are coming from factory closed now. >=20 > I went to Aircraft Spruce and said "I need six quarts of Hysol." They sol= d me six quarts of Hysol. I used it to epoxy in a fuel drain and probe and w= as asked by Matthew Colliers why it wasn't blue. So, I looked closer at my m= anuals 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 t= o the Lancair website and found they don't even carry Hysol 9339, but have c= hanged to Hysol 9360. The product Aircraft Spruce sells is Hysol 9430. Lan= cair tech support says they don't know why 9360 is specified. "That was sel= ected by the guy before me." >=20 > Aircraft Spruce says -=20 >=20 > "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 i= nstead of the 30 minute pot life of the EA-9410 at 77=C2=B0F. Used extensive= ly in the Strojnik S2A sailplane and many other homebuilts." >=20 > Locktite tech support and the data sheets show the pot life, tensile and s= hear 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 t= he differences, and said "they appear to be very similar products". Can any= one 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? >=20 > Mike Baudhuin --Apple-Mail-49100FEF-ECB3-48F6-97B2-080527CE36E6 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable

I'll take a stab at this.

We recommend Hysol or other hi peel strength epoxy adhesives fo= r Carbinge graphite hinges that we sell. Because only small volumes of= this material are needed for our application, we have looked for and d= iscovered alternatives for the quart cans of "Hysol of the week" sold by Lan= cair. It appears that over the years, the conglomerate Dexter Hysol ha= s acquired most competitors and if you buy Loctite or Hysol materials they a= re all made by the same company or at least are all owned by the same corpor= ation. We have seen at least three changes in the Hysol adhesives avai= lable from Lancair over the past ~20 years. Never an explanation, just= a different product. I think that Hysol changes its formulae from tim= e 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 d= ispenser. This obviously wouldn't work well for wing closure but the l= esson is that any formulation of adhesive that has similar chemical and phys= ical characteristics is OK to use.

Sounds like you'= ve done your homework and this product will work. Must be a HUGE wing t= o need six quarts? Make darn sure you don't use too much excess and pl= ug the fuel ports in the wing bays. This has proven fatal for at least= one pilot in the past.

John Barrett

Lead= ing Edge Composites

Sent from my iPad

On= Aug 14, 2013, at 4:51 AM, Mike Baudhuin <mikebaud@gmail.com> wrote:

I am preparing to close a set of wings and have some= questions about Hysol epoxy. I've reviewed previous posts and there h= asn't been much said for awhile, perhaps because wings are coming from facto= ry 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 a= nd probe and was asked by Matthew Colliers why it wasn't blue. So, I l= ooked closer at my manuals and saw that it calls for epoxy and flox if tempe= ratures are below 70 degrees and Hysol 9339 if temperatures are above 70 deg= rees. I then went to the Lancair website and found they don't even car= ry Hysol 9339, but have changed to Hysol 9360. The product Aircraft Sp= ruce sells is Hysol 9430. Lancair tech support says they don't know wh= y 9360 is specified. "That was selected by the guy before me."<= /div>

Aircraft Spruc= e says -

"Thi= s new and improved Hysol glue replaces the old EA-9410-2 glue. EA-9430 has t= he 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=C2=B0F. Used extensively in t= he Strojnik S2A sailplane and many other homebuilts."

Locktite tech s= upport and the data sheets show the pot life, tensile and shear strenght to b= e almost identical. The one difference I can find is that the 9360 spe= cifies shear at different temperatures while 9430 specifies the shear streng= ht only at 77 degrees. The guy from Locktite couldn't explain the diff= erences, and said "they appear to be very similar products". Can anyon= e 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?

Mike Baudhuin

= --Apple-Mail-49100FEF-ECB3-48F6-97B2-080527CE36E6--