Foam in crevices only works as sound dampener. It does not assist in structure integrity. You can do a simple test.

Fill a pipe either steel or plastic. Knock the pipe before you foam it up. You can hear the hollow sound.

Foam it up wait to cure. Then knock the pipe again. It sounds rigid & solid.

Try to break the pipe, hammer, hydraulics, etc. They break the same way.

It is perceived structural strength.

This post has been edited by netmatrix: Jul 27 2019, 11:50 AM

We are talking about damping sounds. Not transmitting sounds. Do we need to go to sounds travels better in water now? C'mon. Give a better example for your words. If you can associate what you say to the problem/ situation in hand everyone would appreciate it a lot.

The stuff they used is most likely 2 part Polyurethane foam. Not the cheap 1 can gap filler foam.



This stuff cures to hardness like concrete. There are marine versions of this as well. That means it is salt water resistant. While these are meant for construction use, does not mean it can't be used "creatively". So filling up gaps in hollow sections of a car could be useful. But if they claim that concrete like hardness is going to translate to increasing overall steel performance and safety, it is going to be a very big concern. I only agree this as a chassis noise dampener, not overall sound dampener, that requires attaching foam panels on to strategic locations like wheel wells and door/ roof panels.

This post has been edited by netmatrix: Jul 28 2019, 12:36 PM

No no. Don't get this wrong. It is not sound insulation. It will reduce chassis noise. That means anything that vibrates through the wheel to the hub to the connecting arms to the bushings to the chassis. Or engine vibration to the chassis. That means the small vibrations that creates noise will be damped or eliminated.

If you want to block off all noise not caused by vibrations use sound dampening foam panels or blocks installed at strategic locations.

More advanced methods makes use of different thickness of metal for welding points on panels to reduce overall noise.

The only thing i do not agree to this foam is increasing safety. Because this product already existed more than 10 years. Not even the company that made the brand of this stuff had a sacrificial car to test and prove their claims. Whats more sending the car to be tested by road safety like ANCAP or Euro NCAP and such.

Actually you can get almost Rolls levels of sound dampening even on a Kancil. But that would mean welding more metal and installing foam sheets that would make the car heavy as hell. Top end cars are not heavy because of the big capacity engine or those thick and deep seats alone. The amount of sound dampening are insane in those cars. And none of it involve injecting stuff between metal crevices. Expensive tires help too.