I have a sensor that the PCB is made of Polyamide, I want to glue it to a rigid PCB. can anyone help me to find the best glue for it? I want to be very smooth.
Najme, there are many adhesives that would work. Loctite has both cyanoacrylates and UV cure adhesives with a variety of properties (e.g. viscosity). I would suggest checking their adhesive guide to find the best candidate: https://www.ellsworth.com/globalassets/literature-library/manufacturer/henkel-loctite/henkel-loctite-design-guide-plastic-bonding.pdf. See page 36 for the polyamide section.
Najme Mohammadyahya Have you ever worked with PDMS? Its a mixture that can be spin coated which will give you good surface properties. You could then lay the PI on top of it and it will cure in air over 12 hours or so and create a nice attachment. Alternatively if surface is important i'd look for spin on adhesives. If you can tolerate some roughness there are some decent two sided tapes out there.
Stan Conston thank you for your answer. I was thinking that the other important factor for choosing glue is that, the sensor that is designed on polyamide PCB, is made from copper, I need a glue that does not affect properties of copper .
I checked the link that you sent me, I did not understand which adhesive is proper for polyamide. I would appreciate it if you can explain a little more.
Adam Weidling Thank you for your response. No I did not work. Actually, My sensor is made of copper and it is fabricated on Polyamide, now I need something that can bond the Polyamide-PCB to a rigid PCB without effecting the properties of copper.
Najme Mohammadyahya PDMS as well as most adhesive are insulators so I suspect it would not have any impact on the electrical conductivity of the copper.
If it needs to be conductive you could check out ACF tape. (https://www.acffilm.com/)
Najme Mohammadyahya, for the Loctite guide, the top row shows different "forms" of polyamide. Most likely, you have unfilled resin or possibly glass filled resin. The left hand column is the recommended adhesives. The values in the table give you the bond strength. Loctite 401 (or 4011 if you need Medical Grade) is probably your best bet and is one of the most common CA (cyanoacrylate) glues used in industry. Frankly, I think that good ole Superglue from your local hardware store could work just fine.
Note a couple of issues in general with adhesives - CA's have quick action (obviously!) but that means you need to get your sensor placed right the first time; outgassing is another issue. CA's, UV cure adhesives, RTV silicones (aka PDMS) all will outgas to some extent and could leave a residue. The CA's usually have the least amount and shouldn't be any issue if your working in a well ventilated place. If present, the residue can easily be cleaned off with isopropyl alcohol. I don't think that any common adhesive will affect your copper components.
Hi,
In my experience, I have used a PDMS membrane stuck to a PCB having a metal pattern via a two-sided adhesive transparent thin layer. Which did not degrade my sensor performance.
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