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Thread: inexpensive but good alternatives to graphlite carbon pultrusions?

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    Registered User berridos's Avatar
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    Re: inexpensive but good alternatives to graphlite carbon pultrusions?

    The nice thing about the Toray pultrusions is that they are T700 and T800S. Thats very high modulus and have a standard TG of 110șC. T700-165Gpa and T800S - 210Gpa.

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    Moderator autoreply's Avatar
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    Re: inexpensive but good alternatives to graphlite carbon pultrusions?

    Quote Originally Posted by berridos View Post
    The nice thing about the Toray pultrusions is that they are T700 and T800S. Thats very high modulus and have a standard TG of 110șC. T700-165Gpa and T800S - 210Gpa.
    Those are fiber properties. Your final laminate will not even come close to those values!


    Heavy gelcoat is not uncommon. Plenty of sailplanes with more weight in gelcoat as yours truly...
    Kennis vermenigvuldig je door het te delen.
    (You multiply knowledge by dividing it)

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    Re: inexpensive but good alternatives to graphlite carbon pultrusions?

    Quote Originally Posted by autoreply View Post
    Those are fiber properties. Your final laminate will not even come close to those values!


    Heavy gelcoat is not uncommon. Plenty of sailplanes with more weight in gelcoat as yours truly...
    I don't think the modulus figures are for just fibers. Toray's spec sheet gives a value of 230 Gpa for the fiber's elastic modulus. 165 Gpa for the rods is 71 percent of that, which is almost believable in a pultrusion, isn't it?
    https://www.toray-cfe.com/en/composi...21-plates.html

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    Re: inexpensive but good alternatives to graphlite carbon pultrusions?

    It was interesting to look at the surface of Toray's "RS" series rods, which apparently are designed to be embedded in mortar or grout and which appear to be extremely rough compared to the rods designed for embedding in an epoxy matrix. The RS series sure look like they'd have a lot of "bite", and that there would be no chance they'd be slipping around if used in an epoxy bed. But, I guess the ones actually designed for epoxy are better, or at least good enough.

    I didn't see any signs of a US dealer.

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    Registered User wsimpso1's Avatar
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    Re: inexpensive but good alternatives to graphlite carbon pultrusions?

    Quote Originally Posted by autoreply View Post
    Those are fiber properties. Your final laminate will not even come close to those values!


    Heavy gelcoat is not uncommon. Plenty of sailplanes with more weight in gelcoat as yours truly...
    I looked at that website, and I agree that the data does look like way too high modulii for laminates, more like fiber characteristics.

    Billski

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    Re: inexpensive but good alternatives to graphlite carbon pultrusions?

    Quote Originally Posted by wsimpso1 View Post
    I looked at that website, and I agree that the data does look like way too high modulii for laminates, more like fiber characteristics.

    Billski
    Yes. I linked to that to show that the fiber numbers were higher than the numbers reported by berridos, though I'll admit I only compared his number for the T700 pultrusion with the site's number for T700 fiber.

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