Epoxy

Other than moisture resistance, is there any real difference between Titebond "1" and "2"?

Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!

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Bob Kaplow
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No detectible difference for rockets, but I bet the doc of materials could measure a difference with his equipment and break dozens more of my prized USR parts!

Jerry

Reply to
Jerry Irvine

It's great for the skin too. Really? "Yes, you're soaking in it!" ;)

It makes a good floor wax and dessert topping, too. ;)

-John

Reply to
John DeMar

LOL! I would enjoy that. What I would really like to do is make a mold of a tensile bar and cast all the glues and adhesives we use. I could put some in a vacuum and perhaps test some at "engine temps" and some sub-zero. The results would be irrefutable.

I feel a test coming on! Can anyone make reusable molds?

Now all I need it for the website to get done so I can upload all the latest data I have. (Hint) ;-)

-- Drake "Doc" Damerau

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NEPRA President NAR Section 614 NAR 79986 L3
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Doc

Christmas is a bitch on the rocket schedule, eh? I have that scheduled for the days after x-mas.

I only have 10 hands! (I do have employees). They wish accociations had common sense too.

Reply to
Jerry Irvine

I'm not sure what that would show us. If to date the tests have show that the material around the joint fails first, we need to figure out what the difference is in the mechanics of the glue joint, not the glue itself. I could have the strongest possible glue but if it didn't soak into the wood very far how does that compare to a lesser glue that soaks in twice as far?

Joel. phx

I still have small squares floating around, did we need more retainer tests?

Reply to
Joel Corwith

I guess it would show exactly what you are saying. "Glue A is twice as strong as glue B, but the bond of glue B is twice as strong as glue A because it soaks in deeper." I know at leas one guy that mixes epoxy and puts it in a vacuum before using it. The tensile bar may show it helps but the bond may not. It was just an idea.

I would like to do a bend test on a but joint. The fin can test showed us a great deal, but the different fillet techniques skewed the results. A but-joint test would directly test the bond without prejudice.

-- Drake "Doc" Damerau

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NEPRA President NAR Section 614 NAR 79986 L3
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Doc

Using what material? I may get a bit of time over the holidays to make up a few samples.

Reply to
Darren J Longhorn

Anything you have. What came to mind was various woods. G-10 or anything else would be a bonus. 2 dissimilar materials is good too. Thickness or size wont mater. I'll extract the force/area.

Doc

-- Drake "Doc" Damerau

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NEPRA President NAR Section 614 NAR 79986 L3
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Doc

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