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A follow-on ... some interesting information re. CLD materials. ...

Posted by andyr (M) on August 20, 2010 at 15:39:44

To follow on from the "Razor" thread (which is now a long way down), I thought I would post the information which the Cascade people sent me when I asked them "Why would your thin butyl layer be better than a thick butyl layer"?

I asked them the question because, although I wanted to use the Cascade product to do a "half Razor" as it has a black surface - and so won't glint under the sock - when it arrived (I had to import it direct from the mfr in Oregon) I found it had a thinner butyl layer than Dynamat Extreme.

Anyway, here is their response:

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When dealing with CLD dampers, it is important to understand that the butyl rubber layer is used merely as a means to couple the aluminum layer to the vibrating substrate. The butyl layer should not be solely responsible for the damping performance of the product. It is the aluminum layer that is responsible for the damping performance.

The aluminum layer should be positioned as closely as possible to the vibrating substrate as the aluminum layer is the "constraining" layer. It is this layer that is responsible for resisting the bending of a vibrating panel. A thick layer, which is basically a heavier layer, moves the aluminum layer out further from the vibrating substrate. It can also be said that at this point, weight alone is performing the damping function which is somewhat outdated in terms of design.

Our VMAX product features a very lightweight butyl layer that is loaded with ceramic microspheres. These microspheres help to reduce the weight of the butyl layer and increase its resistance to heat. If you get the chance, try to pull a small piece of the butyl off of the back of the Dynamat product and watch it stretch and web. Then pull a piece of the butyl from the VMAX product and experience it "snap" off. This makes VMAX much easier to remove and reinstall if necessary.

Both the Dynamat Xtreme and our VMAX product have a 4mil aluminum layer. The Dynamat Superlite product has a 2mil layer (decreased damping performance) and is still heavier than our VMAX product.

A thicker aluminum layer will perform better under rigorous conditions as it has greater tensile strength. Typically CLD dampers with very thick aluminum layers are used in application where high SPL is present. Of course, in these conditions, CLD dampers can only do so much and before a secondary layer is applied, structural reinforcement should be considered.
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Interesting!! :-)) (And it's easier to remove, as well.)

Regards,

Andy

Edits: 08/20/10

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