? about DYNAMAT

[dennis68]

UPDATE..... I received the foam from McMaster; it's pretty thick but only weights about 5 lbs for the whole roll. It made a HUGE difference in NVH, I find myself driving much more aggressively (yeah, it's possible) due to the decreased noise form the engine. More than once I have glanced at the tach and thought "Crap, I must be doing over 100MPH, better slow down". Way quieter inside.



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[MarkM66]

Dennis,

Can you provide a link, or pn for that product?

How thick is it?

[69Rathead]

Yeah a link or name of it please. Sounds like just what we need. Appreciate all the info you have provided thus far.

[dennis68]

It's 1" thick (very compress able) part #5692T52. It's technical name is "Flat sound absorbing foam, adhesive back, foil-faced, 1" thick, 54" width".

Here is a link to McMaster's site. Type in "sound absorbing" into the search bar and it will come up.

10.53/foot. I bought 3 feet and it almost covered, I wish I would have bought another 2 feet. I would order a little long to be sure.

[Tom Welch]

did you get an msds with the product? I'm curious about the urethane content of this product. Also is Polyether safe to breathe?

[dennis68]

Nope, didn't request one. Google reveals that many aucoutic companies install it in homes for sound proofing so I would imagine it's OK.

Also out this stuff, 9709T25 . It is a NON asphalt based dampner. It rates .21 on the DLF scale. The heaviest stuff they sell is .34. Asphalt based stuff is only .10-.13. I may peel back the foam to apply this under it.

Check out catalog page 3270 in the online catalog....it goes into very good detail the different types of sound reduction products and how they are rated.

[Tom Welch]

The product that you have may work well but unless it is sealed completely I recommend further research. The foam is a polyether polyurethane. At temperatures over 350 degrees (unlikely) toxic fumes are generated. Health hazard data reveals that inhalation and eye irritation can occur from dusting of the foam and from thermal degradation/decomposition. The msds says all this. It sucks but I dont believe that this foam is the safest stuff to use.

[dennis68]

If it gets 350* on the floor then the car is on fire anyways....Breathing the foam won't be a problem as my ass will be long gone.

[JoshStratton]

Be careful with that foam. Don't put it anywhere where moisture can collect. You could end up with rust hidden under it and you wont know it is there until your feet are popping through the floor boards. This is why I like Dynomat/and other companies that use the tacky pads with aluminum. You get a good seal. If you have bubbles you cant get out, use an exacto-knife to cut a small crease to let the air out and then press it in. It should seal itself, but you can use glue or sealant if you are worried about moisture there. Also, it has the aluminum cover which also works as a moisture barrier....kinda like the plastic covering on your higher-end carpet pads (anyone want a dog?).

I have used it many times before. I put $500 worth of the stuff in my last VW Bug

I am replacing the door skins on my 79 TA and put Dynomat on the skin before I welded them in. It is so freggin amazing how well that stuff works. The door sounds like fiberglass or plasic now.

[69boo307]

I use 'Peel and Seal', get it at your local roofing supply place. They use it to seal/soundproof mobile homes. It basically is DynaMat, or at least it's where they got the idea for DynaMat. The main difference is that you can buy enough to cover every inch of your interior for about 1/5 the price of Dynamat. I believe it is asphalt-based, but has pretty much no odor. I did the entire interior of my '02 camaro with it, and it didn't smell at all.

[JoshStratton]

I use 'Peel and Seal', get it at your local roofing supply place.

I have wanted to try that. Maybe I will put some in my Jeep this summer since I won't have that as long as my TA. I wanted to see what happens to it when it is allowed to remain in a sweltering summer car. I wonder if the smell becomes stronger.

[Tom Welch]

The butyl rubber stuff is the best as far as smell goes. If applied properly it wont come out without a fight. As far as rust goes, POR 15 or equivalent should solve that problem before it starts. If there is a polyethelyne foam product available then that would be safe. Thats the same material used for drink containers and pipes for potable water etc. I plan to use it when I find a manufacturer that has some available to test for the insulation kit project I have posted about in the past.

[TheRoaringEagle]

Hey STEVE1969LS1 I was reading the posts and saw that you did your whole interior in dynamat xtreme. I want to do the same but you mentioned that it's stil loud inside? My car is really loud inside right now, no interior and holes in the firewall, also it gets hot. But was there an improvement at least? I want it quiet enough so I can put some speakers in my kickpanels and be able to hear them and at least a medium volume setting.

Thanks!

[Tom Welch]

Eagle, you will need some sound insulation products. The Dynamat and similar products dont do much for sound reduction or for heat reduction. Those types of materials are mainly for vibration dampening. Didnt mean to get the jump on Steve, but I was here.

[TheRoaringEagle]

Well how should approach this? I ordered the bulk Dynamat Xtreme and I'm starting to clean up the floorpans. Is there a secret combination of sound deadner, sound insulation, and heat protection/insulation?
I saw some sound insulation products in the NPD Camaro catalog. One isthe factory sound deadner. The other is an 'aerospace' style that reduces noise up to 60 decibels. It seems like a Dynamat imitation. Could I use the factory insulation over the Dynamat Xtreme? Is there any wrong in stacking different types of deadners and insulations over each other?

Is TAC MAT a good sound insulation product? What are good examples of sound insulators if Dynamat and TAC MAT are not?

Thanks for the reply!!

[Tom Welch]

Well, its no secret, just a challenge to find a lightweight, flexible, waterproof sound absorber and insulation product all rolled into 1. I have found 2 products that will work for this and am making it part of the insulation package I've been working on. I will offer a dynamat alternative in widths of 36" AND 24" and a LOT less expensive than the 'branded' stuff. If you are interested in this I will also be offering bulk quantities of these products.

[69Rathead]

I think this forum is great! I like the purity of it! I like the fact that we can come here and avoid all the advertisements etc. that come with trying to find products/combos that work and can share info and help eachother out without feeling like every where we turn somebody is trying to make a buck off of us!

[TheRoaringEagle]

yeah hey, i just wanted to know what products would work. anyone else know of a combination that will help insulate and deaden sound and heat in a killer way? ;) i already have bulk dynamat xtreme and was thinking bout TAC MAT for the firewall and transmission tunnel, mixed with factory insulation on top...?

[69Rathead]

Eagle..Read through the entire thread lots of info with good links to research. I know Dennis used some stuff recently that may help when added with the Dynamat you bought. Could be little thick though. But he commented that it compresses pretty good. Thanks to lots of people contibuting we have alot of useful info to go through.

[69protour]

Hey Tom, I'm ready for the products anytime now. If you've got something going let me know whats available from you. I've been looking at a lot of different products and if you've got some good combinations of heat and sound deadners I'll gladly get it from you. Let me know soon. Thanks much Trond