Dynamat ProX

Dynamat ProX is our heavy-duty sound-deadening material, built on the same installer-proven butyl formula as Dynamat Xtreme but engineered with a thicker 5-mil aluminum layer and twice the mass for maximum vibration damping on large, resonant panels. When a build demands the most aggressive treatment we make, this is it. It's the material you reach for when nothing lighter will do.

NoiseVibrationComplete

Dynamat ProX

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NoiseVibrationComplete

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Why Choose Heavy-Duty Sound Deadening

Heavy-duty deadening belongs on the panels that need the most mass, and that's exactly what ProX is built for.

More Mass, More Damping

Effective vibration damping requires mass. A panel rings because thin sheet metal flexes, so adding a dense, well-bonded layer turns that energy into heat instead of noise.

Dynamat ProX is thick sound-deadening material by design: a 120-mil butyl core under a 5-mil aluminum constraining layer, 0.130 inches (3.30 mm) total, and a full 1.0 lb per square foot. That’s twice the mass of Dynamat Xtreme, which makes ProX the thickest sound-deadening mat in our line.

Independent third-party SAE J1637 testing measured Dynamat ProX at a 0.568 composite loss factor at 200 Hz, 238% above the industry average, exactly where low-frequency drone is hardest to control. On doors, floors, and trunk panels, that added mass tames vibration that lighter materials may leave behind.

ProX vs. Xtreme: When to Step Up

Both use the identical proprietary butyl formula, so this isn’t about quality. It’s about how much mass the job calls for. Dynamat Xtreme is the industry standard for full-vehicle coverage and tight, complex spaces. Step up to Dynamat ProX when you’re treating large, flat, resonant panels or chasing the last few decibels on a demanding build.

On the Dynamat thickness question, ProX measures 0.130 inches against Xtreme's thinner profile and weighs twice as much per square foot. More mass means more damping, though it also means more weight and a stiffer mat, so most builders run ProX on the worst offenders and Xtreme everywhere else.

Best Applications

ProX isn't for every panel in the build. Heavy-duty treatment is built for large, highly resonant panels that demand more mass than standard applications.

Audio and Restoration Builds

For sound pressure level (SPL) competition builds and sound-quality systems, treating the door skins, trunk floor, and rear deck with ProX controls the resonance that muddies bass and robs output as part of a complete car audio sound-deadening strategy. It's equally at home in restoration work, where the large, flat floors and firewalls of classic bodies benefit from added mass, bringing modern heavy-duty sound-deadening material to vintage steel without changing the look.

When a panel is light or sits near a heat source and doesn’t need full mass, step down to a lightweight sound-deadening layer, and explore our classic car sound-deadening collection for products that complete your restoration plan.

Dynamat ProX: FAQs

Dynamat ProX is 0.130 inches (3.30 mm) thick, with a 120-mil butyl core and a 5-mil aluminum constraining layer, weighing 1.0 lb per square foot. That's twice the mass of Dynamat Xtreme, built for maximum damping on large panels.

Both use the same proprietary butyl formula. Dynamat ProX is twice as heavy, with a thicker 5-mil aluminum constraining layer and more mass for maximum vibration damping. Xtreme is the standard for full-vehicle coverage, while ProX steps up to large, resonant panels and the most demanding builds.

Not automatically. More mass means more damping on large, resonant panels, but coverage and placement matter more than raw thickness. Treating the right areas of a panel with well-bonded material beats a thin, patchy layer spread everywhere.

Use ProX where panels are big and problem noise is worst. You don't need to cover every square inch to hear the difference.

Use it on large, resonant panels such as doors, floors, trunks, and firewalls and on demanding audio or restoration builds. That's where heavy-duty sound-deadening material like ProX delivers the greatest reduction in noise and vibration.

Yes. ProX uses the same installer-proven proprietary butyl formula as Dynamat Xtreme. The difference is mass and aluminum thickness. It's the same professional-grade material, engineered with more mass, made in the USA, and FMVSS 302-compliant.