Dynamat

Dynamat Original is a Styrene-Butyadine-Rubber based and Pressure Sensitive Adhesive Backed, Heat Bondable, Sheet Metal Vibration Damper. This product
is made to conform and fuse to automotive body surfaces such as floor pans
and doors. Product shall be die cut to shape and placed onto the body
surface after sheet metal cleaning operation and prior to the paint system
(typically at the sealer application operation) or on painted panels.
Adhesive side is smooth, giving complete contact with the underlying surface
without any air pockets of channels. Both material and adhesive can
withstand temperature ranges between -30C to +177C(-22F to +350F) and are
highly resistant to aging.

Acoustic Properties:
The acoustic loss factor " n " is used as a measure of
ability to damp structure-borne sound. It states how much vibrational energy
(in steel sheets, for instance) is converted into heat rather than sound.
For constructions containing several layers, the combined loss factor " n
comb " is used. The theoretical maximum loss factor is about 1. An undamped
steel panel 1 mm thick has a loss factor of roughly 0.001 at 200 Hz. Damped
with Dynamat Original the loss factor would be about 0.16 at +0C(32F).

Dynamat Specifications:
Appearance: Thin, Smooth, Black Mat w/Blue Release Liner
Thickness: 0.070"
Weight: 2.44 kg/m2 (5.37lbs/1.19yd2)
Acoustic Loss Factor @ Temperature
(Using ASTM method E756 @ 200 Hz): .16 @ 0 C
.13 @ 15 C
.08 @ 30 C
.04 @ 45 C
.04 @ 60 C
Temperature Resistance Range:-30C to +177C(-22F to +350F)
Chemical Resistance:Resistant to water and mineral oils
Adhesive Peel Strength:15 N/cm, 8.6 lbs/in on steel sheet at +86F (+20C)
Fire Classification:Meets FMVSS 302
Handling And Application:The material must be at room temperature before
handling and application.

Installation:
Dynamat should be cut to the desired size and shape before the backing paper is removed.
It may be cut with scissors, knife, or die. Remove
dust, grease, moisture, and other foreign matter from the application
surface. Peel off the backing paper. The simplest application technique is
to bend the pad slightly and attach it along its shortest edge. The pad is
then pressed firmly into place, preferably with a roller for larger pieces.
This reduces the risk of leaving air pockets, which reduce the sound damping
capacity. The temperature of the pad and application surface should not be
below room temperature during fitting. Heating the material before applying
is strongly recommend, and increases flexibility, and adhesion.

Coverage:
How much is enough? Always the first good question. You do not
need to cover the entire panel--edge to edge. Cutting the Dynamat material
into one inch strips and spacing it out over a panel to achieve a 25 percent
coverage will give you excellent sound dampening characteristics.
The Knuckle Test: Rap your knuckles on the panel before you install any
Dynamat to learn what a bare panel sounds like. Then adhere a one inch strip
of Dynamat in the center of the panel.
Rap it again to see out the sound has changed. Add another piece of material
to the left and right of your center piece, splitting the difference between
the edge of the panel and your center strip.
Rap the panel again to hear how the sound has changed. Repeat this process
until you are satisfied with the “density” of the sound level.

Surface Preparation:
The time spent in preparing the surface is equal to the
satisfaction and success of your efforts. A through cleaning of the body
panel surface is highly recommended. The body panels of fiberglass bodied
aircraft, should be thoroughly cleaned before applying Dynamat.
Clean these surfaces with a metal prep type solvent material to remove all
dirt, oil, tar, glue and wax deposits. The preparation of vertical surfaces
is particularly important for adhesion.

Contour Conditions:
Dynamat can be heated with a heat gun to make it more
pliable to stretch over humps and to penetrate valleys and crevasses. Heat
the material—don’t cook it! Wear canvas or leather gloves to protect your
hands from heated material.

Multiple layers:
The Dynamat material is 0.70" thick. The mat material can
be "built up" through multiple layers for greater sound-dampening capacity
if needed.

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