klem
Well-known member
Surprised this hasn’t been specifically addressed as a topic, but I’ve searched and searched… I’ve been looking for cases for microphone systems (e.g., including PSU, shock mount etc.). I’m using a lot of Pelican cases or equivalents with ‘pick and pluck’ layers of foam. Most cases have multiple layers of this foam, and will be far less fragile if, once cut into their final shapes, are bonded both to each other and to the outer case. However, if I had to choose between just bonding the layers of foam together or bonding the outer layers to the case, I’d definitely prioritize bonding the foam layers together.
I am concerned, of course, about any chemical reactions between the foams, case, and any adhesive that could cause damage to the capsule. I am no chemist, but I bet someone one here is. Can anyone recommend a glue, tape, spray etc. adhesive that is known to be compatible in long term (gaseous) contact with mic capsules?
Pelican has a tech bulletin for welding parts to its outer case / shell made of polypropylene (PP), but no such bulletin for their Pick N Pluck™ foam, which is described as an “ester” foam and polyurethane based.
I called Pelican, and a CSR stated they can’t give an official endorsement of a product or compatible chemical, but have heard from many users that 3M Super 77 works well for bonding the foam to itself and the case, and seems to be recommended on lots of other forums, along with Foam Fast 74. I’ve linked the SDSs for the 3M products. Note both of these are the low VOC version of the product, which I ASSume has less chance of creating compounds / gases that adversely affect capsules.
Are either of these products (see SDS sheets) safe for long term coexistence with foam and capsules?
3M Super 77 SDS
3M Foam Fast 74 SDS
A couple of semi-related threads:
https://groupdiy.com/threads/microphone-cases.58354/
https://groupdiy.com/threads/this-is-why-you-line-you-mic-boxes-with-silk.43042/
Appreciate any insight or links to overlooked threads.
I am concerned, of course, about any chemical reactions between the foams, case, and any adhesive that could cause damage to the capsule. I am no chemist, but I bet someone one here is. Can anyone recommend a glue, tape, spray etc. adhesive that is known to be compatible in long term (gaseous) contact with mic capsules?
Pelican has a tech bulletin for welding parts to its outer case / shell made of polypropylene (PP), but no such bulletin for their Pick N Pluck™ foam, which is described as an “ester” foam and polyurethane based.
I called Pelican, and a CSR stated they can’t give an official endorsement of a product or compatible chemical, but have heard from many users that 3M Super 77 works well for bonding the foam to itself and the case, and seems to be recommended on lots of other forums, along with Foam Fast 74. I’ve linked the SDSs for the 3M products. Note both of these are the low VOC version of the product, which I ASSume has less chance of creating compounds / gases that adversely affect capsules.
Are either of these products (see SDS sheets) safe for long term coexistence with foam and capsules?
3M Super 77 SDS
3M Foam Fast 74 SDS
A couple of semi-related threads:
https://groupdiy.com/threads/microphone-cases.58354/
https://groupdiy.com/threads/this-is-why-you-line-you-mic-boxes-with-silk.43042/
Appreciate any insight or links to overlooked threads.
