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#1
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
Looking at plastics like UHMW and delrin... wondering how important is "UV stabilization" for outdoor use? How long does it take for ultraviolet light to damage the plastic? Months? If it really matters, is black Delrin most likely to be the UV stabilized type? Many of them say the color is black but they don't specify UV stabilization or the specific Delrin part number/type. Thanks. |
#2
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
John Doe writes:
How long does it take for ultraviolet light to damage the plastic? Months? Polyethylene tubing will positively crumble after a year or two in sunlight. I had an injection line on my pool that would leak under pressure after 3 or 4 months. Consider wrapping with aluminum duct tape. |
#3
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
"John Doe" wrote: Looking at plastics like UHMW and delrin... wondering how important is "UV stabilization" for outdoor use? Very. How long does it take for ultraviolet light to damage the plastic? Months? If you are lucky. Lew |
#4
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
"John Doe" wrote in message et... Looking at plastics like UHMW and delrin... wondering how important is "UV stabilization" for outdoor use? How long does it take for ultraviolet light to damage the plastic? Months? If it really matters, is black Delrin most likely to be the UV stabilized type? Many of them say the color is black but they don't specify UV stabilization or the specific Delrin part number/type. Thanks. Yes, months but varies with your climate and sun exposure. If it is not specified with UV inhibitors, don't count on it being there. If a grade is not specified chances are it can vary or be mixed. Black molded parts are the best for getting rig of rejected parts by grinding them and blending in the virgin material. |
#5
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
On Mar 31, 8:37*pm, "Edwin Pawlowski" wrote:
"John Doe" wrote in message et... Looking at plastics like UHMW and delrin... wondering how important is "UV stabilization" for outdoor use? How long does it take for ultraviolet light to damage the plastic? Months? If it really matters, is black Delrin most likely to be the UV stabilized type? Many of them say the color is black but they don't specify UV stabilization or the specific Delrin part number/type. Thanks. Yes, months but varies with your climate and sun exposure. *If it is not specified with UV inhibitors, don't count on it being there. If a grade is not specified chances are it can vary or be mixed. *Black molded parts are the best for getting rig of rejected parts by grinding them and blending in the virgin material. Edwin is correct. If you need UV..and any outdoor usage does...pay the money and get the right stuff. Do you really have time to do the the job twice? TMT |
#6
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
Too_Many_Tools wrote:
On Mar 31, 8:37*pm, "Edwin Pawlowski" wrote: "John Doe" wrote in message Looking at plastics like UHMW and delrin... wondering how important is "UV stabilization" for outdoor use? How long does it take for ultraviolet light to damage the plastic? Months? Yes, months but varies with your climate and sun exposure. *If it is not specified with UV inhibitors, don't count on it being there. If a grade is not specified chances are it can vary or be mixed. *Black molded parts are the best for getting rig of rejected parts by grinding th em and blending in the virgin material. Edwin is correct. If you need UV..and any outdoor usage does...pay the money and get the right stuff. Do you really have time to do the the job twice? For the vast majority of projects, I would guess No. My problem isn't just a matter of cost, I'm going to start with only about 1 foot of Delrin rod. The problem is trying to figure out what is UV stabilized and what isn't. I asked McMaster-Carr and they said they don't have any more information than what is on their website, the specifications listed with the product. Other online outlets give about the same information. My project is experimental and maybe the exposure to sunlight will be limited enough. It's a first design, and that usually sucks anyway, so I should probably back off on the UV concern for the moment. If it works, I'll take the advice and spend more on the subsequent design, ordering from a more specialized store like the ones that require minimum line item and total order amounts. But, to begin with, I'd like to experiment with a short rod of several different Delrin/Acetal types. The project can actually use more than one type at a time. Thanks. -- For what it's worth. I'm making stopgaps for between in-line skate wheels. The Acetal rod will be underneath and supported by a U-shaped metal flat bar that rests up against the bottom of the frame on both sides. The stopgap will be between each pair of wheels, several per skate (probably starting with just one skate). That's to help keep obstacles from getting up in between the wheels and causing seizures. |
#7
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
"John Doe" wrote in message ... Too_Many_Tools wrote: On Mar 31, 8:37 pm, "Edwin Pawlowski" wrote: "John Doe" wrote in message Looking at plastics like UHMW and delrin... wondering how important is "UV stabilization" for outdoor use? How long does it take for ultraviolet light to damage the plastic? Months? Yes, months but varies with your climate and sun exposure. If it is not specified with UV inhibitors, don't count on it being there. If a grade is not specified chances are it can vary or be mixed. Black molded parts are the best for getting rig of rejected parts by grinding th em and blending in the virgin material. Edwin is correct. If you need UV..and any outdoor usage does...pay the money and get the right stuff. Do you really have time to do the the job twice? For the vast majority of projects, I would guess No. My problem isn't just a matter of cost, I'm going to start with only about 1 foot of Delrin rod. The problem is trying to figure out what is UV stabilized and what isn't. I asked McMaster-Carr and they said they don't have any more information than what is on their website, the specifications listed with the product. Other online outlets give about the same information. My project is experimental and maybe the exposure to sunlight will be limited enough. It's a first design, and that usually sucks anyway, so I should probably back off on the UV concern for the moment. If it works, I'll take the advice and spend more on the subsequent design, ordering from a more specialized store like the ones that require minimum line item and total order amounts. But, to begin with, I'd like to experiment with a short rod of several different Delrin/Acetal types. The project can actually use more than one type at a time. Thanks. DuPont's UV-stabilized Delrin (there are several grades) is a popular material for sailboat sheaves, and has been for decades. I had some of them on my keelboat that was in the water 6 months out of the year, with the sheaves constantly exposed to the sun, and I had no problem with them over a period of 5 years or so. It's a common material. You shouldn't have any trouble finding it. -- Ed Huntress |
#8
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
John Doe wrote:
My problem isn't just a matter of cost, I'm going to start with only about 1 foot of Delrin rod. The problem is trying to figure out what is UV stabilized and what isn't. Available here... http://www.professionalplastics.com/DELRINSHEET-ROD -- dadiOH ____________________________ dadiOH's dandies v3.06... ....a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it at http://mysite.verizon.net/xico |
#9
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
"dadiOH" wrote:
John Doe wrote: My problem isn't just a matter of cost, I'm going to start with only about 1 foot of Delrin rod. The problem is trying to figure out what is UV stabilized and what isn't. Available here... http://www.professionalplastics.com/DELRINSHEET-ROD That's the store I was talking about when I said "$20 line item..." |
#10
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
On Tue, 01 Apr 2008 16:26:04 GMT, John Doe
wrote: "dadiOH" wrote: John Doe wrote: My problem isn't just a matter of cost, I'm going to start with only about 1 foot of Delrin rod. The problem is trying to figure out what is UV stabilized and what isn't. I think you'll find balck Delrin will last several years under moderate sunlight exposure. I used to build hardware for high-end custom sailboats. We made custom fitted anchor rollers with a choice of bronze bushed stainless or Delrin sheave. A Delrin sheave was considerably less expensive, and I don't recall ever receiving a complaint or a request for a replacement. Here's the sort of thing I'm talking about, from the present incarnation of my business. The anchor is resting on the sheave. http://nautilus-marine.com/img/hodgdon1-lg.jpg -- Ned Simmons |
#11
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
I bought some of that black Delrin from McMaster-Carr and made some
masthead sheaves for my little sailboat out of it. I also made two spares just in case. It only took 1 hr to make them. Haven't tried them yet, the ice just melted. I'll let you know if they fail this year. |
#12
Posted to rec.crafts.metalworking,rec.woodworking
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Delrin UV stabilization, does it matter?
Dan@ (Dan ) wrote:
I bought some of that black Delrin from McMaster-Carr and made some masthead sheaves for my little sailboat out of it. I also made two spares just in case. It only took 1 hr to make them. Haven't tried them yet, the ice just melted. I'll let you know if they fail this year. I bought 9 feet total of small diameter Delrin and acetal copolymer, much more than enough. If it's not slippery or durable enough, I might try Delrin AF later. All of the stuff in my most recent order was either rod, flat bar, or tube. I was pleasantly surprised they were able to ship the stuff UPS ground, including two 8 foot long aluminum tubes, for only eight dollars. Shopping online is great when you need to know technical information, even though they couldn't tell me whether it's UV stabilized. The local Borg wouldn't even know what type of aluminum or steel their rod/bar/tube is made of. All the online merchant has to do is include the technical information with the product description. |
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