interior door panel plastic type?

[slowride]

Does anyone know what type of plastic, besides cheap crappy etc, is used on the interior door panels? Specifically the plastic structural part inside the grab handle that breaks. Not the white pieces in there but the main part they sit in. Looking to find the right epoxy or something to fill in that channel under the rubber cover on top of the grab handle that will adhere to the plastic and harden to reinforce it before it breaks completely in two. This would be a 2013 door panel

 

[Kee Fuller]

I got some loctite expandable foam. I wrapped the handle in saran wrap a few times. Then wrapped the handle with duct tape a few times and shot the foam into the handle. Let it dry fkr 24 hours and it's pretty solid