[DeTomaso] Sound Deadener - Dynamat Xtreme vs Peel & Seal

Wed Jul 13 02:47:17 EDT 2011

This is a follow up to last month's discussion regarding sound deadener products; specifically "Dynamat" versus a much less expensive 

alternative found at Home Depot and Lowes called "Peel & Seal Gutter Patch and Flashing."

First of all, "thank you" to Kenn Green for sending me a scrap of Dynamat Xtreme to test against the Peel & Seal. Note that the Peel & 

Seal is supposed to be equivalent to Original Dynamat. Dynamat Xtreme is a superior product to original Dynamat.

Observations:
 - Both products appear to be very similar. 

 - Both are paper backed on the adhesive side.
 - Both have a foil backing on the opposite side; the Dynamat Xtreme has a shinier foil surface which appears to be thicker in profile than that of the Peel & Seal

 - Both have a butyl rubber compound between the adhesive side and the foil side
 - Both measured .05" thick (excluding peel off paper backing)
 - Although they measured the same thickness, the Dynamat Xtreme product felt heavier or more dense. However I did not weigh the specimens before setting fire to them.

Test: 

I approximated the test procedure for FMVSS 302 which specifies a flame spread rate not to exceed 102 mm/m. I did not construct the test 

box/oven per the speck, however I did set up the test apparatus in my garage according to the following specifications of the standard: 

 - 38mm flame height
 - Specimen in horizontal position, positioned 19mm above burner tip
 - Exposed specimen to flame, but did not limit exposure to 15 seconds
 - Note that samples did not meet the size requirement of the specification and were too small to calculate per/minute flame spread rate.

Results:
1) Peel & Seal

   Flame penetrated foil backing within 15 seconds.
   Butyl rubber/asphalt core began to melt and drip from exposure to flame
   The core readily caught fire once the foil was breached

2) Dynamat Xtreme

   Foil backing withstood flame for 2 minutes

   Butyl rubber core bubbled and became very sticky/gooey, but remained intact
   The core readily caught fire once the foil was breached

Conclusions:
The Dynamat Xtreme product is clearly the superior product in this comparison. The thicker foil provided greater protection against direct 

exposure to flame, and the denser core material was more resistant to breakdown under the extreme heat of the flame, possibly because the 

Dynamat product does not utilize asphalt in the core. Both products cores burn with direct exposure to flame; burn rates appeared to be 

similar, however the sample size was too small to gather sufficient flame spread rate data.

Given the price difference, I will use the Peel & Seal product as originally planned. It will be sandwiched between the firewall and a 

stainless steel firewall cover which will provide added protection against direct exposure to flame, so I'm not too concerned about the 

lesser protection afforded by the foil backing of the Peel & Seal.

Cheers!
Garth
#4033

________________________________
From: Garth Rodericks <garth_rodericks at yahoo.com>
To: Julian Kift <julian_kift at hotmail.com>; De Tomaso List <detomaso at realbig.com>; "adin at frontier.net" <adin at frontier.net>
Sent: Thursday, June 23, 2011 2:43 PM
Subject: Re: [DeTomaso] Sound Deadener [WAS: The Answer: #93 from the Icky Old Man Institute of Research]

FWIW...

Dynamat Xtreme:

Lightweight elastomeric butyl based core

Can withstand temperature extremes between -65°F and +300°F 
(-54°C to +149°C)
Fire Classification: Flammable, but meets FMVSS 302*
No MSDS, merely a technical spec document with marketing information the manufacturer/vendor wishes to share. Unfortunately I could not find a published MSDS for Dynamat Xtreme or Dynamat

Dynamat (original):
Styrene-Butyadine-Rubber based core
Can withstand temperature extremes between -22F to +350F (-30C to +177C)
Fire Classification: Flammable, but meets FMVSS 302*

Peel & Seal:
Styrene-Butyadiene-Styrene block copolymer (10-20%) and Asphalt (40-60%) - Arguably the exact same compound as used in Dynamat, unfortunately I could not find a published MSDS for Dynamat.

Fire Classification: Has not been certified against FMVSS302; MSDS states "There is no potential for fire or explosion."

MSDS: http://solutions.mfmbp.com/MFM%20MSDS%20PEEL%20AND%20SEAL.pdf
Note that I will conduct my own flammability test before installing in my car this weekend. 

Anyone have a scrap of Dynamat I can set fire to for comparison sake?

There are also other alternatives to Dynamat too, some marketed as 'automotive sound deadeners' and others as industrial sound deadener/insulation products such as those available from McMaster Carr or Grainger.

* FMVSS 302 was adopted in 1971 and became effective for vehicle model 1972. 

  - This standard set a flame spread rate not to exceed 102 mm/m. This was deemed adequate for the occupant to stop the vehicle and exit without serious harm. 

  - FMVSS 302 is applicable to interior components including seating, door panels, headliner, carpet, seat belts, air bags, package shelves, instrument panels, steering wheel covers and padding, etc. (note – this is not everything – just some examples)
  - More details: http://www.a2la.org/conclaves/conclave2009/minutes/Materials%20Testing%20Advisory%20Committee%20Summary%20-%20Attachment%201.pdf

________________________________
From: Julian Kift <julian_kift at hotmail.com>
To: garth_rodericks at yahoo.com; De Tomaso List <detomaso at realbig.com>; adin at frontier.net
Sent: Thursday, June 23, 2011 1:03 PM
Subject: RE: [DeTomaso] Sound Deadener [WAS: The Answer: #93 from the Icky Old Man Institute of Research]

The Peel N Seal is a roofing product and asphalt based, whereas Dynamat is a Butyl based product, so they are not the same.

The asphalt products don't stick as well, smell of asphalt in the heat and being asphalt based are flammable, you get what you pay for.....

Julian

> Date: Thu, 23 Jun 2011 12:39:06 -0700
> From: garth_rodericks at yahoo.com
> To: detomaso at realbig.com; adin at frontier.net
> Subject: Re: [DeTomaso] Sound Deadener [WAS: The Answer: #93 from the Icky Old Man Institute of Research]
> 
> Looks like it's also available in a 36" x 33-1/2' roll too, but I haven't seen this product person to verify it has the same asphalt-based compound.
> 
> http://www.lowes.com/pd_154032-81326-PS36_0__?productId=3090099&Ntt=peel+%26+seal&pl=1¤tURL=%2Fpl__0__s%3FNtt%3Dpeel%2B%2526%2Bseal&facetInfo=
> 
> Cheers!
> Garth
> 
> 
> 
> ________________________________
> From: Garth Rodericks <garth_rodericks at yahoo.com>
> To: DeTomaso Mail List <detomaso at realbig.com>; "adin at frontier.net" <adin at frontier.net>
> Sent: Thursday, June 23, 2011 12:24 PM
> Subject: Sound Deadener [WAS: The Answer: #93
 from the Icky Old Man Institute of Research]
> 
> 
> David,
> 
> Nice post. I like the videos. Is that your GT40 in the Fernley video? Looks and sounds beautiful!
> 
> Anyway, I was researching less expensive alternatives to Dynamat and came across a recommendation for "Peel & Seal" gutter patch and flashing, available from Lowe's for $15 a 25' rool (6" wide). 
> 
> http://www.ratrodsrule.com/forum/showthread.php?t=3226
> 
> 
> Supposedly the same stuff as 'original' Dynamat. I'm putting this on the firewall and hatch cover in my Pantera.
> http://www.lowes.com/pd_154017-81326-PS625_4294934213_4294937087_?productId=1018733&Ns=p_product_prd_lis_ord_nbr
> 
> Cheers!
> Garth
> #4033
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