Thermomelt sticks for reflow temperature verification

Have a good idea for a new product for SFE or Olimex? Let us know!

Moderator: phalanx

Post Reply
Posts: 50
Joined: Sat May 13, 2006 8:44 pm

Thermomelt sticks for reflow temperature verification

Post by hooziewhatsit » Tue Apr 10, 2012 11:01 pm

I recently came across this things, and they're really pretty cool. ... stiks.aspx

I was getting ok results with the reflow oven controller. I put a chunk of the 400*F stick on my boards and found they didn't quite melt. Meaning my peak temp wasn't 400*F (ie, well below what it should have been for the Kester paste I was using). The stick itself is like chalk (I used a knife to chip off small pieces to put on the circuit board). When it melts it balls up and changes color. Very easy to tell if you hit that temperature or not.

I bumped the peak temperature up (almost 30*F to 450* :shock:), and my 425*F stick still isn't quite melting. However, the 400*F is, and I'm getting much better results. I wasn't able to find somewhere that sold the 413*F stick, so I'm kinda aiming towards getting the 425 to melt (which is still in my profile).

I think the 413*F and 425*F sticks would likely cover 99% of the users here. The 450*F stick would be good for lead free soldering.

Basically, it's a way to verify that you aren't completely cooking your components, but at the same time, that you got everything hot enough to do what it's supposed to.

User avatar
Support Volunteer
Posts: 1362
Joined: Sun Mar 05, 2006 9:23 pm

Re: Thermomelt sticks for reflow temperature verification

Post by EmbeddedMan » Wed Apr 11, 2012 11:14 am

I second this - I'd love to be able to confirm max temp was reached on each batch of boards that go through the oven. I'd buy 'em SparkFun!


Posts: 1
Joined: Wed May 18, 2016 6:54 am

Re: Thermomelt sticks for reflow temperature verification

Post by JPLatham » Wed May 18, 2016 7:00 am

I agree, this is a critical tool. However, I noticed the link you provided no longer existed. Nissen Markers manufactures a similar temperature indicating stick available for a variety of temperatures. Check them out! ... ng-sticks/

Post Reply