Nov 8, 2012 at 6:39 am #1295869
I have a plastic rod that is about 1/8" in diameter and about 8 feet long. I got it at a surplus store many years ago. The clerk said it had been part of a pop-up tent of some sort. It is very stiff yet pliable. I think it would work as a bivy hoop or maybe a rounded top for a tent like the Mountain Hardware Hoopla.
But what is it made of…….nylon, delrin, flubber? Any clues?Nov 8, 2012 at 6:50 am #1927036
It looks sort of like the piping that they put in the trim of upholstery.Nov 8, 2012 at 7:46 am #1927052
I do recall seeing that stuff where old furnture has worn spots. I think the stuff I have is much stiffer than that but without a piece of it in my hand I can't be sure.
DarylNov 8, 2012 at 6:10 pm #1927181
If you have enough of it that yu can sacrifice some, and the ability to measure the temperature you could try melting a piece and then look up the melting points of various possible plastics. Or, take it down to your nearest TAP plastics store and see if they can identify it.Nov 8, 2012 at 7:08 pm #1927188
There's one just down the hill from me.
Never been there.
Oh boy, a field trip.Nov 9, 2012 at 2:45 pm #1927385
My suspicion is that it could be a nylon.
I doubt it would be Delrin, but not impossible.
It could also be a polyethylene or similar.
It could be glass-reinforced, possibly/maybe, as it looks a bit stiff. Try cutting 5 mm off the end and see what happens.
Yes, melting point would help, or accurate density if you can measure the weight and diameter accurately. If you do the measurements I may be able to convert them into material. I have tables.
CheersNov 9, 2012 at 3:13 pm #1927387
@bestbuilderLocale: Pacific Northwest
Roger, you never cease to amaze me.Nov 9, 2012 at 6:04 pm #1927417
+1 on Tad's comment.Nov 9, 2012 at 10:12 pm #1927449
@scfhomeLocale: Chocorua NH, USA
My money's on fiberglass.
If so, a sharp utility knife blade applied near an end should show the fibers.Nov 10, 2012 at 12:54 am #1927456
> My money's on fiberglass.
Yeah, that too is very possible. You will find out fast if you try to trim the end!
CheersNov 10, 2012 at 10:03 am #1927501
Samuel and Roger,
I did the end trimming experiment you suggested and I'd say it is fiberglass. When snipped the end tended to crush and form a mini shaving brush. It makes sense to me because the stiffness feels like fiberglass. I was initally thrown off because it looks white and shiny like nylon.
I also took the measurements if you want to see how it comes out on your charts. However, at this point, I have little doubt about it being fiberglass.
Length =2590.8mm (about 102 inches)
Diameter = 3.12mm (about 1/8")
Weight = 38.2 grams
Thanks to all the detectives for the help.Nov 10, 2012 at 10:48 am #1927503
@jamesdmarcoLocale: Finger Lakes
Yeah, it looks like a plastic of some sort with fiberglass embedded. This was especially common amungst tool manufatcurors(Makita, Milwalukee, etc) about 20 years ago. Nowdays, it is mostly just plastics they use.Nov 10, 2012 at 12:20 pm #1927517
The density (~1.93 g/cc) is too high to be any common plastic. The ends are dead set for fibreglass though. And yes, the stuff has been used for that sort of thing.
Just a suggestion: be a little careful when you cut it: the fine glass can be an irritant. If you want to be really safe, cut with a fine hacksaw with water flowing over it. Or just do it outside with the dust blowing away from you.
CheersNov 10, 2012 at 4:21 pm #1927548
@scfhomeLocale: Chocorua NH, USA
A mini cut-off saw, widely available, has a thin 2" circular blade that is good for FG and Carbon. OK for ALU also, but dulls quickly with that.
Amazon now has a beefier 3" blade cut off saw for around $70, or twice the price of the mini, that takes both composite blades like those used on arrow saws that are 1/32" thin, or carbide tripped blades that are 1/8" thin. The carbide tipped ones have less teeth, so might do some tearing. On the other hand, the arrow saw composite blades come with a warning about shattering. That's why I always liked the 2" metal blades on the little saw, but it is on the anemic side. Maybe it's time to take another look at saws.
Also, good quality fine particle masks are not hard to find. Carbon fiber has a distinct odor when cut without using a mask – a good warning signal.Nov 11, 2012 at 7:36 am #1927607
So, assuming this is fiberglass, I ordered some 1/16 and 1/8 diameter pieces to compare and play with. Only $2 each for 4 foot long pieces.
Thanks for the safety and cutting tips.
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