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geekhack Community => Other Geeky Stuff => Topic started by: BucklingSpring on Sun, 06 March 2011, 19:41:28

Title: Epoxy question
Post by: BucklingSpring on Sun, 06 March 2011, 19:41:28

Is shaping epoxy while it is still malleable can weaken the final result when fully set/hard?

The instructions says workable for about 15 minutes. But I wonder if I change the shape let say 2 hours after mixed if it is going to ruin the compound.

Title: Epoxy question
Post by: nanu on Sun, 06 March 2011, 20:02:10

The epoxy I've used is brittle once cured.
But I've only used the quick setting type (cures in 5 minutes) and it is only good if the surfaces are rough or have something to grab onto.

Title: Epoxy question
Post by: chimera15 on Sun, 06 March 2011, 20:03:01

Yes, it can.  It will weaken it, because you're breaking bonds that are partially solidified.  It depends how much you do it though how weak it will become.  It also depends on the material of course.

Title: Epoxy question
Post by: chimera15 on Sun, 06 March 2011, 20:16:57

Quote from: ripster;306506

I'm not sure but can confirm that epoxy as a **** extender is not going to work.

Yeah you gotta use silicone for that.  It might work as a core though.

Title: Epoxy question
Post by: BucklingSpring on Sun, 06 March 2011, 20:43:11

Quote from: chimera15;306505

Yes, it can.  It will weaken it, because you're breaking bonds that are partially solidified.  It depends how much you do it though how weak it will become.  It also depends on the material of course.

Thanks! That`s what I thought. In this specific application, it was not used as glue but as a filling to redo the "casing" of a micro USB conector.

Above is a similar connector with the casing.
The casing broke on the one below, USB wires were loose between the left part and the tip. I made an EPOXY casing and before it was too hard (~2 hours) I used my thumb to even the shape.
(http://geekhack.org/attachment.php?attachmentid=15864&stc=1&d=1299465450)

Title: Epoxy question
Post by: BucklingSpring on Sun, 06 March 2011, 20:48:00

Quote from: ripster;306506

I'm not sure but can confirm that epoxy as a **** extender is not going to work.

Uh Uh...:ballchain:

Title: Epoxy question
Post by: nanu on Sun, 06 March 2011, 20:52:32

I've really got to get some canned Plasti-Dip for cable repairs like this (http://www.instructables.com/id/Fix-a-stripped-wire-on-your-headphones/).

Title: Epoxy question
Post by: BucklingSpring on Sun, 06 March 2011, 20:53:12

Quote from: chimera15;306515

Yeah you gotta use silicone for that.  It might work as a core though.

And just to be clear. Here's what is attached to the other end of the USB cable:

(http://www.usbdildos.com/usb-vibrator.jpg)

Uh Uh x 2

Title: Epoxy question
Post by: BucklingSpring on Sun, 06 March 2011, 21:06:25

Quote from: ripster;306555

Self Sealing Silicone Tape is amazing stuff.

Maybe for softcore.

Epoxy better for hardcore.

Title: Epoxy question
Post by: BucklingSpring on Mon, 07 March 2011, 20:19:49

Quote from: chimera15;306505

Yes, it can.  It will weaken it, because you're breaking bonds that are partially solidified.  It depends how much you do it though how weak it will become.  It also depends on the material of course.

Case closed, epoxy worked as intended. I did a stress test and concluded that USB tip will break before the epoxy. So reshaping it didnt do too much dammage.

Title: Epoxy question
Post by: BucklingSpring on Mon, 07 March 2011, 21:05:10

Quote from: ripster;307326

Good thing you cased the joint first.

English is not my main language. If there is a joke, an expression or a weird allusion in there, I don't get it. Sorry.

Title: Epoxy question
Post by: BucklingSpring on Tue, 08 March 2011, 07:32:24

Quote from: ripster;307331

Beating A Dead Horse

You sick americans... This is not a good tribute to your roots.

Why don't you just do like the mexicans
(http://image14.webshots.com/15/7/31/60/161973160tjCJEf_ph.jpg)