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#1
posted to rec.boats.building
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Portlights from G10?
A previous thread mentioned Bronze portlights (absurdly heavy) and
also plastic ones (maybe not strong enough) but the glass/plastic composite G10 is certainly strong enough. Might be interesting to try. |
#2
posted to rec.boats.building
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Portlights from G10?
On Tue, 29 Dec 2009 21:29:07 -0800 (PST), Frogwatch
wrote: A previous thread mentioned Bronze portlights (absurdly heavy) and also plastic ones (maybe not strong enough) but the glass/plastic composite G10 is certainly strong enough. Might be interesting to try. A very quick look shows G10 with a tensile strength of 40,000 PSI taken "lengthwise" and 35,000 PSI "crosswise". I assume that these are taken in line with and across manufactured slabs. Cast bronze, on the other hand, varies depending on the specific alloy. An alloy, referred to as a "general purpose bearing bronze alloy" is listed as having a tensile strength of 35,000 PSI. Compression strength is radically different though with bronze listed as having a compressive strength of 20,000 PSI while G10 lists a "flatwise" compression strength of 60,000 PSI and a edgewise strength of 35,000 PSI. Hardness is listed as Rockwell M 110 for the plastic and Brinell Hardness of 55 - 65 for the bronze. Rockwell and Brinell tests are not directly convertible and so far I can't find any cross reference data for these two ranges. From a materials point of view there seems no reason not to use G10. Whether it will stand up well to UV is another question. some plastics do not. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
#3
posted to rec.boats.building
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Portlights from G10?
On Dec 30, 12:29*am, Frogwatch wrote:
A previous thread mentioned Bronze portlights (absurdly heavy) and also plastic ones (maybe not strong enough) but the glass/plastic composite G10 is certainly strong enough. *Might be interesting to try. Is anyone currently manufacturing them? -m |
#4
posted to rec.boats.building
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Portlights from G10?
On Dec 30, 10:10*am, max camirand wrote:
On Dec 30, 12:29*am, Frogwatch wrote: A previous thread mentioned Bronze portlights (absurdly heavy) and also plastic ones (maybe not strong enough) but the glass/plastic composite G10 is certainly strong enough. *Might be interesting to try. Is anyone currently manufacturing them? -m G10 is not as hard as Bronze but neither is the plastic normally used for portlight frames. UV could be a problem but there must be UV inhibitors in the other plastics too. G10 is hard on tools but easy to work with. I have used it as backing plates on several of my homemade boats. |
#5
posted to rec.boats.building
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Portlights from G10?
On Dec 30, 10:59*am, Frogwatch wrote:
On Dec 30, 10:10*am, max camirand wrote: On Dec 30, 12:29*am, Frogwatch wrote: A previous thread mentioned Bronze portlights (absurdly heavy) and also plastic ones (maybe not strong enough) but the glass/plastic composite G10 is certainly strong enough. *Might be interesting to try. Is anyone currently manufacturing them? -m G10 is not as hard as Bronze but neither is the plastic normally used for portlight frames. *UV could be a problem but there must be UV inhibitors in the other plastics too. G10 is hard on tools but easy to work with. *I have used it as backing plates on several of my homemade boats. Max: Send a drawing and I'll look into what it would cost for materials. I'd do it just as an experiment for free other than cost of materials. e-mail: replace "point" with . ie decimal point. |
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