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Old 11th October 2012, 07:30 PM   #11
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Have you considered using a sheet of neoprene for the viscoelastic properties? That would allow you to use what ever adhesive works best. Alternatively a elastomeric polyurethane likeVEF-41may suit your needs.

Polyurethane Viscoelastic Foam Resin
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Old 13th October 2012, 08:16 AM   #12
Tytte71 is offline Tytte71  Norway
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Quote:
Originally Posted by Monteverdi View Post
I am still looking for a viscoelastic glue. Vibratec is unavailable in the US. Swedac has 2 products: DG-06 (2 component PU) and DG A2 (water based acrylic) but I did not find any supplier either. I have tried Green Glue but it is not working very efficiently in constrained layer. It is not a glue (but green) and is designed for plaster board (2 layers held by screws). Wall damp is identical in these properties.
Many constrained layer constructions use elastic glues/layers (e.g. silicone, rubber) but viscoelastic layers are much more effective. An alternative would be a thin viscoelastic sheet but most I have found are relative thick and loaded with some additives to add mass.
Try contacting Swedac directly - it's a small service minded company.
A2 is told to be very effective in constrained layer cabinets.
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Old 11th November 2013, 06:17 PM   #13
cuibono is offline cuibono  United States
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check out the dyad glues: http://www.soundcoat.com/soundcoatdamping.pdf

also, here is a good article on the basic design principles of CLD materials:
http://csaenglive.moogaccess.com/pap...ingSystems.pdf

It mentions a couple of viscoelastic polymers/glues that are available.
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File Type: pdf CSA1995_PassiveDampingSystems.pdf (913.3 KB, 15 views)
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Old 11th November 2013, 06:27 PM   #14
Bare is online now Bare  Canada
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IF .. serious, one could look into construction adhesives.
As even a rudimentary start point.
For example: structural glazing utilises a variety of silicone adhesives with distinct and varying Modulus of Elasticity properties.. up to and past 100% even .
PolyU caulks/glues are another. Lotsa choices actually
Time to do some ernest looking ?

Last edited by Bare; 11th November 2013 at 06:29 PM.
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Old 11th November 2013, 07:32 PM   #15
cuibono is offline cuibono  United States
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This was also a fairly helpful/practical article from 3M:
http://multimedia.3m.com/mws/mediawe...0Polymers%2011
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File Type: pdf Viscoelastic Damping Polymers 112- 130-.pdf (185.7 KB, 14 views)
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Old 12th November 2013, 03:52 AM   #16
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Quote:
Originally Posted by Monteverdi View Post
I am searching for some viscoelastic glue (or sheet) for constraint layer construction. I found Green Glue in my web searches and also used it. It uses water as a solvent (no VOC) but it therefore works only with material which can absorb water like wood, MDF or gypsum board. It also has a quite low adhesive strength. I would like to use it on aluminum or composites. I assume that the new Magico Q series uses some constraint layering otherwise these speakers would ring in spite of their fancy bracing.
I could find some polyurethane glues which are elastic but not viscoelastic.
... constrained by masonite sheet. See URL: Loudspeaker construction

Did not read the other posts here; just a quick response.

Regards,

WHG
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Old 12th November 2013, 06:47 PM   #17
cuibono is offline cuibono  United States
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3M has so many sound damping products. Here are some more glues:
3M? NVH Dampening Material, 50 mL, 34274
3M NVH Dampening Material 04274
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Old 12th November 2013, 07:10 PM   #18
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I assembled my speakers back in the late 70's using Liquid Nails. I though I'd made a bad mistake at first, but the stuff firmed up nicely and has good damping properties.
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Old 12th November 2013, 07:33 PM   #19
wesayso is offline wesayso  Netherlands
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Most of the better constrained layer damping sheets for cars use butyl with a thin layer of aluminum.
The butyl products stay elastic, most asphalt based products dry out eventually.
It (butyl) sticks very well but I don't think its a substitute for glue. It does do the job gluing the sheets
to a car door and keep it there for years though.

Last edited by wesayso; 12th November 2013 at 07:36 PM.
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