Adhesive Comparison?

[Jim Garry]

EDIT: I think I've figured it out.


Original:
Is anyone experienced enough or expert enough to know the difference between the two adhesives below?

It's been recommended that I use Loctite EA 9460 epoxy adhesive to seal a piece of aluminum to a magnesium bell housing. It will keep oil from escaping the reservoir and add some strength.

I have no doubt this stuff will do the job well. But I already have in my possession 3M Scotch Weld Epoxy DP125. I'd rather use what I already have in my garage if it will do the job equally well.

Any thoughts?

[10rmotor]

Do you have any samples of both mag and aluminum you could use to do some test lap shear coupons?

[Jim Garry]

Unfortunately, no samples of mag. Good idea though.

[EACIII]

I have some small pits of mag I could let you have. What size piece would you need for the test?


Ed

[Jim Garry]

Ed that's very kind of you. I really appreciate your offer. I'm going to bypass a test however because both of my candidates are good adhesives and even going with the lesser of the two will be overkill I believe.

Thanks again!

[Rick Iverson]

I think I've figured it out.

Perhaps share?

[zangyomotorsports]

I would recommend obtaining the spec sheet of both, and choose the higher operating temperature for your application. Standard epoxy adhesive is typically removed with heat (a heat gun) and might be removed by your hot oil. Several years ago this was a good choice:
Henkel CorporationAerospace Group
2850 Willow Pass Road
P.O. Box 312
Bay Point, CA 94565 USA
925.458.8000
Fax: 925.458.8030
www.aerospace.henkel.com
Description
Hysol EA 9394/C-2 is an elevated temperature curing, high service temperature structural paste adhesive.
Qualified to MMM-A-132, Type II structural paste adhesive. Hysol EA 9394/C-2 uses a non-aromatic amine
curing agent that retains many of the excellent properties offered by aromatic amine cured systems, high
temperature service with a long pot life.
Features
Excellent Strength Above 400°F/204°C
Non-MDA, Non Aromatic Amine Curing Agents
Long Pot Life
Bond Strength Performance
Tensile Lap Shear Strength
Tensile lap shear strength tested per ASTM D1002 after curing for 1 hour @ 200°F/93°C. Adherends are
2024-T3 bare aluminum treated with phosphoric acid anodized per ASTM D3933.
Typical Results
Test Temperature, °F/°C psi MPa
-67/-55 3,500 24.1
77/25 5,000 34.5
180/82 4,000 27.6
250/121 3,200 22.0
300/149 3,000 20.7
350/177 2,500 17.2
400/204 1,700 11.7
450/232 1,200 8.3
500/260 800 5.5
Service Temperature
Service temperature is defined as that temperature at which this adhesive still retains 1000 psi/6.9 MPa using
test method ASTM D1002 and is approximately 450°F/232°C.

[Jim Garry]

Looks like it must cure for an hour at 200 degrees?

[Jim Garry]

Perhaps share?

The two choices were similar but one had a higher operating temp. It had a lower shear rating but was still plenty high.