The Hoodliner Technical Information


The Hoodliner is a Polyether Urethane Based with a Reinforced Aluminized Facing and Pressure Sensitive Adhesive on application side, thermo-acoustic foam. This product is made to be applied inside the automotive engine compartment to the underside of the hood. Product shall be die cut to shape and placed onto the underhood surface. 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 -40°C to +107°C (-40°F to +225°F).

Acoustic Properties

The effectiveness of an acoustical foam is dependent on its ability to convert soundwaves into heat energy. Hoodliner has a combination of open and closed cells to accept sound waves and dissipate them. If all of the foam cells were open, sound waves would simply pass through. Conversely, if all of the foam cells were closed, few sound waves would be absorbed. The acoustic foam in Hoodliner is cast in sheets, achieving consistent resistivity levels throughout the foam. Thus, maximum sound absorption is assured.

Heat Resistive Properties

Hoodliner has a reinforced aluminized facing which provides 97% heat reflection. This reflection reduces heat transfer to the hood and reduces wear to the painted surfaces.


Hoodliner is used as an automotive engine compartment treatment. It is also used in other applications requiring heat resistive acoustical foams.


Hoodliner should be cut to the desired size and shape before the release liner 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 release liner. The simplest application technique is to bend the Hoodliner slightly and attach it along its shortest edge.

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Gray acoustic foam with aluminized facing

Top Surface:

1 mil Reinforced Aluminized Polyester




.13 (lb./ft³)


2.0 (lb./ft³)

Random Incidence Acoustical Thermal Resistivity (R):

2.7 (hr-ft2-deg.F/BTU)

Tensile Strength:


Fire Classification:

Meets HBF

Tear Strength:


Sound Absorbtion Coefficients (Using Reverberation Room Method -ASTM C423-84a and E-795-83 – Mounting A):

0.22 @ 125 Hz
0.42 @ 250 Hz
0.70 @ 500 Hz
0.93 @ 900 Hz
0.87 @ 1 kHz
0.75 @ 1.2 kHz
0.72 @ 2 kHz
0.71 @ 3 kHz
0.70 @ 4 kHz

Temperature Resistance Range:

-40°C to +107°C (-40°F to +225°F)

Dynamat, Inc. 3042 Symmes Road | Hamilton, OH 45015 USA | P: (513) 860-5094 | F: (513) 860-5095