2010-18 Fenders: what is this?

[davepen]

What is this material on the back side of an OEM fender called? Does it have a specific name? What is it made out of? What is it's purpose?

I'm thinking stiffening, and sound deadening.

Aftermarket fenders usually do not have them.

Thanks all.

 

[Princeton_Man]

I believe you hit the nail on the head. As for what it's called, I have no idea.

 

[bigdodge]

It's a vibration dampener. Needed on large panels to keep them from resonating. Used a lot in car audio

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[JayLuke]

interesting

 

[Daw14]

Rust accelator

 

[davepen]

Rust accelator

Funny. That's why I'm replacing mine.

Aftermarket fenders don't have them, which is no surprise since it obviously costs money to put it there. They do make a difference, though. You can tell just by tapping on a Chinese fender (which are thinner to begin with).

 

[bigdodge]

It's not foam. It's like tar on paper. I don't see how that will help rust form.

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[davepen]

It's not foam. It's like tar on paper. I don't see how that will help rust form.

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I think he was kidding.