ISOD

Discussion in 'BigBox General Chat' started by R Design, Jun 13, 2016.

  1. R Design

    R Design Well-Known Member

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    Trying to figure out how to approach a particular problem, I was just going through the datasheets for the various Colorfabb co-polyesters once again.

    Usually I'm fixated upon the "stiffness" of the material and it's "strength". With half an eye on the melting point as well.

    Now in a desperate attempt to understand the advantages of HT over XT (apart from temperature) have finally noticed "Izod Impact Strength". https://en.wikipedia.org/wiki/Izod_impact_strength_test

    It turns out that HT is spectacularly higher that XT in this department.

    And it also turns out the the carbon fibre XT-CF20 is very very very feeble!

    HT : http://colorfabb.com/files/AmphoraHT5300-TDS.pdf

    XT: http://colorfabb.com/files/amphora_pds_en.pdf

    XT-CF20: http://colorfabb.com/files/TDS-carbon-en.pdf

    and nGen: http://colorfabb.com/files/AmphoraAM3300-TDS.pdf

    (remember we are guessing Edge is nGen-like in origins...)
     
  2. mike01hu

    mike01hu Well-Known Member

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    The trouble is that IZOD is an impact test and not a measure of stiffness. There was a test carried out on stiffness of various materials but I can't remember where but I do recall that XT-CF20 came out best with very little deflection.
     
  3. R Design

    R Design Well-Known Member

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    Exactly @mike01hu the stiffness is in the datasheets as Tensile or Flexural modulus. It's XT-CF20 that aces that.

    ISOD is something that was completely off my radar. I can see it's a part of what might constitute "toughness" and now I have a better understanding of when it might be useful to use HT. Since it costs more and is harder to print it's not a no brainer.
     
  4. mike01hu

    mike01hu Well-Known Member

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    Another thing that fogs the vision is that some materials only meet their ideal characteristics after heat soaking the model, a real risk for engineering items as some distortion is likely, unsurprisingly!

    For me, impact testing was something I did at college umpty years ago, so it's not on my radar either!
     

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