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Old 27th November 2011, 04:19 AM   #1
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Default viscoelastic adhesive

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.
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Old 27th November 2011, 05:19 AM   #2
ScottG is offline ScottG  United States
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WallDamp
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Old 27th November 2011, 05:46 AM   #3
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I'm not an expert on these matters but look into Blachford Antivibe. It appears to be right in line with your goals.
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Old 27th November 2011, 06:04 AM   #4
ScottG is offline ScottG  United States
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http://www.vibratec.se/data_sheets/N...20Yellow-1.pdf
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Old 27th November 2011, 06:38 AM   #5
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It seems to be similar to Green glue as being water based and requiring materials which can absorb water. WallDamp might work but assembly with a glue which allows lateral movement before curing would be easier.
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Old 11th October 2012, 04:32 AM   #6
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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.
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Old 11th October 2012, 04:51 AM   #7
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Try the 'inverted moquette'
It is the carpet with gummed base, attached to the walls of the cabinet
not by the base but by the fluffy side
So the gum sheet is free to absorb & flex
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Old 11th October 2012, 03:30 PM   #8
badman is offline badman  United States
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Interesting concept!
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Old 11th October 2012, 05:26 PM   #9
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Quote:
Originally Posted by picowallspeaker View Post
Try the 'inverted moquette'
It is the carpet with gummed base, attached to the walls of the cabinet
not by the base but by the fluffy side
So the gum sheet is free to absorb & flex
There are a lot similar approaches for speaker building (like Black Hole 5) or for automotive applications. Most include (visco)elastic layer(s) with some mass loaded layers but any of these are not what I am interested in: constrained layer cabinet wall construction.
One option would be to coat 1 or 2 sides with a viscoelastic spray like Cascade VB-1S PRO Quiet Kote Damping Spray or similar product (thin coat - 1mm thick). When these coats are dry one glues the 2 layers together with PU. Has anyone experience with that approach?
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Old 11th October 2012, 06:10 PM   #10
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Silicon?
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