Electronic Circuits and Projects Forum

This

http://www.vishay.com/docs/11010/bond200.pdf

makes it sound like it's some kind of superglue (cyanoacrylate)? Maybe that rubber-toughened super glue that's more flexible than normal? From Loctite (craft shops and tool stores) or Mercury Adhesives (at hobby shops).

Originally Posted by dknguyen

This

http://www.vishay.com/docs/11010/bond200.pdf

makes it sound like it's some kind of superglue (cyanoacrylate)? Maybe that rubber-toughened super glue that's more flexible than normal? From Loctite (craft shops and tool stores) or Mercury Adhesives (at hobby shops).

Vishay They were charging USD 550 for S&H and USD 125 for processing even when i told them that i was a student and offered them proof!

Originally Posted by jpanhalt

1) Which adhesives do you have available? Of those adhesives, are there modified versions available, such as the neoprene modified cyanoacrylics or epoxies? Is Pliobond available (it is a solvent-based, neoprene contact cement)?
2) What are the materials you are trying to attach? That is, the best adhesive for metal to metal is different than for plastic to plastic, rubber to plastic, etc. There are even good ways to attach Teflon to steel, but you need to know what the materials are that you are trying to attach to each other.
3) Do you need a flexible bond, a bond that is shock resistant, etc. Does the bond need to be water resistant or waterproof?

John

I want to bond a strain gauge on to a stainless steel bar.I 2.5 to 3mm in diameter.A video said that it was similar to superglue(http://www.elfy.com/epoxies.htm) This is a company that produces superglue over here.I can mange to get their products.

A flexible bond since i will bend the steel bar not completely but to some extent.

Samad Bond Super(P4) - Samad Rubber Works (PVT) Ltd.(P4) - Samad Rubber Works (PVT) Ltd.)
This is also available here.Made of neoprene rubber.But personally having used this i dont think this will do.

Samad Bond looks like it is very similar to Pliobond. My point was not to use it by itself. It is used in small quantity to modify the epoxy and make it less brittle . Use it only if the epoxy you chose is too brittle and snaps off the SS when it is deformed. Follow the mixing directions I gave. BTW, you can try it in CA adhesives too.

If you want to reference use of neoprene as a modifier, see: Handbook of Adhesives, 3rd ed., Irving Skeist, ed., Van Nostrand Reinhold, New York, 1990.

As stated in my post, it was a "make do" solution before I had ready access to flexible epoxies.

John

Hi i got this from an application engineer at Vishay's:

es the M-Bond 200 is a Cyanoacrylate which is also what “super glue” is. Our adhesive is selected and tested by our Engineering department to qualify as a strain gage bonding adhesive. I recognize your problem but I cannot recommend an alternative. When people are forced to use other than up to date or qualified materials I usually advise testing them to prove them out. But then that my require some extra gages to accomplish.

So if i take his word...this will do right?


Elfy Adhesives and Sealents

When you click on the cyanoacrylate link you get SUPERGLUE!.

I can use it then right?.

Thanks.

I used super glue and it works great, Do you have the preparation instructions? What type strain gauge are you using and for what, if you don't mind me asking.
Kinarfi
On mine, squareness with the shaft was very critical, after a few, this is the method I used,
Place the strain on a clean surface and put a piece of scotch tape on it as squarely as you can.
Put some tape on the bar you're going mount this on to insulate the leads from the bar.
Place the taped strain gauge on the bar and look at the squareness and do it over until you think it's perfect, not just good enough, Stick one side of tape good and lift the other side using the stuck side as a hinge. Put a drop of super glue on the bar and lay the taped strain gauge back down and hold in place with a piece of plastic bag between it and your thumb with pressure for about 30 to 60 seconds to make sure it bonds, then leave it alone for an hour. My strain gauges had a resistance of 350 ohms per leg and max variation was less than .7 ohms, you will be dealing with Δ voltages in 100 µvolt range, so don't expect even the best VDM read it.
Hope this helps
kinarfi

After you get your strain gauge mounted, read this thread,Wheatstone + Op Amp, in short get an INA128 instrument amplifier.

Hi Kinarfi, thanks(and others too) for your reply.I am going to use the elfy super glue.Also thanks for the installation pdf.I found a video(in 2 parts) that do exactly what is written.

YouTube - Strain Gage Installation (Part 1)

YouTube - Strain Gage Installation (Part 2)

PS: I also called Omega inc a week ago and they said that they do not ship to Pakistan.And i am having to pay the same money to buy some crap from China which i hope works.


Sorry didnt answer you question...just read it.I am using a 3.4mmx6.6mm (backing dimension widthxlength) with a grid dimension of 2.44mmx3mm(widthxlength) on a steel bar to determine its bending.The steel bar 2.5 mm in diameter.Adhesives are not available here and neither are strain gauges.Any pointers?

My strain gauge will also be of 350 ohms.