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12-31-2013, 05:32 PM | #1 |
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Front bumper material?
What is our front bumper made of? I picked up a front bumper that is cracked but relatively easy to repair.
Polyurethane?
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12-31-2013, 05:55 PM | #2 |
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Haven't had mine off, but just about every car on the market in the past 10 yeasr has had polyurethane bumpers. i can't imagine ours is any different.
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12-31-2013, 06:17 PM | #3 |
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If it's poly it's the most brittle poly in the history of poly. They break really easy.
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12-31-2013, 06:20 PM | #4 |
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You aren't supposed to repair a cracked bumper.
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12-31-2013, 06:30 PM | #5 |
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Not talking the steel crash bar. The plastic cover. Figured it was polyurethane but wanted to be sure.
Thanks guys!
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03-12-2024, 01:09 PM | #6 |
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Old thread but was trawling the forums looking for this information because I'm in the process of making some repairs myself. I though it was worth making a correction:
The bumpers are made out of polypropylene (PP). It's clearly stamped on the part (this type of material information can be found stamped on almost every plastic part on the car.) Knowing the bumper is made of PP is critically important because it's a Low Surface Energy (LSE) material: most adhesives/epoxies/glues don't work on it, especially if you need the repair to be strong and hold load. There are specialized structural adhesives out there that are made to work with PP, but you need to know what to look for AND they tend to be expensive (3M DP8005 / DP8010 and Infinity Bond MMA 500). Your budget option is to use a primer (like Loctite 770) and cyanoacrylate glue (i.e. super glue) BUT usually a repair like this won't be strong unless you have a really close fit and get it put back together with precision. Last edited by EndlessAzure; 03-12-2024 at 01:35 PM. |
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03-12-2024, 01:40 PM | #7 |
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On the other hand, PP lends itself very well to plastic welding. I've repaired several household items with a cheap soldering iron and some doner PP (from plastic jar lids). Using a purpose made plastic welder should work much better.
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