EA-40 measuring ?

[monterey]

I use the bvas method.

[Roy from Pa]

You must eat out a lot at Wendys?

[Crooked Stic]

For you guys using butcher paper I am betting Masking paper from Menards is cheaper. 3 foot roll and saw it in half.

[oldfartfarmer]

for you guys who sniff it,
what's it smell like--or do you remember?

[Flem]

OK, I'll be the first to admit I like the smell of epoxy. It's has a nutty aroma. I also like the smell of polymer modified thinset.

[Crooked Stic]

the hardener has a smell. Not like any nuts I know of. I was thinking ammonia smell to me.

[Roy from Pa]

Just gonna behave here:)

 

[Bvas]

You must eat out a lot at Wendys?

More than I care to admit. But it beats the hell outa McDonald’s and gas station food.

[Tim Finley]

When cooking it smells like corn chips . If you weigh out equal a and b you will have to much part b and have no heat resistance . Part b weighs less than a . I measure mine out in 8 oz solo cups and mix with hobby sticks .

[Flem]

When cooking it smells like corn chips .

Exactly! I have always thought of corn nuts

[Roy from Pa]

Ya betcha have...

 

[canopyboy]

When cooking it smells like corn chips . If you weigh out equal a and b you will have to much part b and have no heat resistance . Part b weighs less than a . I measure mine out in 8 oz solo cups and mix with hobby sticks .

Yup my understanding is that each part has a different density. I never found out the right ratio to mix by weight but I know it’s not 50/50.

At some point my wife bought some little condiment cups. They came in something like a 1000 pack for a few bucks. But one full one of each part and a little extra part a for good measure bvas style is enough for a longbow with lots of layers.

[Mad Max]

https://www.smooth-on.com/tb/files/EA40.pdf

[Flem]

[canopyboy]

I stand corrected...

 

[Mad Max]

Flem it also says.
 Mix ratio is 1:1 by volume. When mixed by 2A:1B by volume, EA-40® will achieve
greater heat resistance and improved physical properties

[Flem]

Flem it also says.
 Mix ratio is 1:1 by volume. When mixed by 2A:1B by volume, EA-40® will achieve
greater heat resistance and improved physical properties

You are right there, Mark. Unfortunately they don't give the respective performance data for the different mix ratios. Would be nice to know if one ratio is more applicable for bow making than the other. I'm not willing or compelled to cook my bows at 250deg for a 217deg heat distortion temp.

[Shredd]

I am surprised that no one has done a strength or adhesion test at different curing temps and torture tests at different temps...  I would or may do it but I always have my hands full with experiments already...  I would bet curing at 100-120 degrees and curing at 180 -250 degrees is not gonna be a big difference in adhesion qualities...  I remember doing a quick test on EA40 when I first started making bows...  I don't remember at what temp I cured the stuff but I remember pulling lams apart and the wood was ripping...  It was probably at room temp because I don't think I had an oven yet...  If the wood is giving before the epoxy bond is, it's good enough for me...

[Roy from Pa]

I've done strength & adhesion tests at different curing temps and torture tests at different temps, Shreddy....

[Shredd]

I've done strength & adhesion tests at different curing temps and torture tests at different temps, Shreddy....

   Cool... What were the results???   Or did you post it on here??   In which case what is the title of the thread...  Thanks...