Since the post I put up a few days ago asking about the type of plastic used in the roll hoops and other trim pieces has mysteriously disappeared, T thought I'd take up the topic again.

While several of you said the plastic was ABS, its actually PP (polypropylene).

I found an article by Jeff Lucius that describes this plastic (http://www.stealth316.com/2-dp8005.htm). This is what the articles says:

[I]PP plastic is a "low energy" or "non-stick" plastic. This group includes Teflon, or polytetrafluoroethylene. The basically inert or inactive molecular structure of PP and PE is described as a "low energy state". Despite their widespread usefulness, "low energy" plastics have a quality that can make them hard to work with - they are difficult to seal or bond using commonly available sealant adhesives. Cyanoacrylate, epoxy, polyurethane, silicone (RTV for example), and most acrylic adhesives do not stick to polypropylene and polyethylene.

Recently, 3M developed a unique adhesive that allows structural bonding of PP and PE, without any surface treatment except cleaning and light sanding, to similar plastics and to other surfaces such as other types of plastics, wood, aluminum, glass, and concrete. This product is absolutely amazing, according to Jeff!

Scotch-WeldTM DP-8005 is a solvent-free, two-part, acrylic-based, structural plastic adhesive designed to structurally bond Polyolefins to themselves and to many other substrates. It uses a one-step process that requires no pre-treatment of the substrates other than removing dirt and oil. Like Polyolefins themselves, DP-8005 provides very good chemical resistance. Similar to most polypropylenes and polyethylenes, maximum continuous service temperature for DP-8005 should be kept under about 212

 

According to the article, PP won't bond with cyanoacrylates (superglue), but your latest anti-vibration bumper for the windscreens suggests superglue and a drying accelerant. Does this mean the new bumpers will eventually fall off, or is it possible the roll hoops are not made of PP?

 

The bumper strips do adhere, so go figure. The dome bumpers kept coming off. I'm quite sure the roll hoop plastic is PP, although I haven't checked the marking stamped on the back. All of the other plastic pieces I've checked are stamped PP or PP-T.

I had to remove the bumper strips from the roll hoops when we installed the new roll bar, and they stuck so tight it tore rubber off the back of the strips.

I think Honda has moved away from ABS because of environmental issues, although I don't know if PP is any better.