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Paper Stronger Than Cast Iron

Posted by kdawson on from the write-on dept.

TaeKwonDood writes "All paper is made of cellulose, which at the nanoscale level is quite strong, but paper processing makes large, fragile fibers that break easily. Researchers in Sweden have have come up with a manufacturing process that keeps the fibers small, resulting in 'nanopaper' with over 1.6 times the tensile strength of cast iron (214 megapascals vs. 130 mPa). And since cellulose is the most abundant organic compound on the planet, it's cheap to use compared to other exotic, expensive-to-produce options — such as carbon nanotubes."

19 of 327 comments (clear)

  1. It's strong enough to build a ship by camperdave · · Score: 5, Funny

    It's strong enough to build a ship out of... as long as you don't get it wet.

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  2. Iron Man's nemesis... PAPER MAN by Armon · · Score: 5, Funny

    Coming next summer, the Epic battle between Robert Downy Jr. as Iron Man, and an unknown antagonists who goes by the mysterious PAPER MAN! /attempt at humor

  3. Milli-pascal? by dascandy · · Score: 5, Informative

    > 214 megapascals vs. 130 mPa

    214 megapascal (singular, it's a unit) is about 1.6*10^9 more than 130 millipascal. Use your units properly.

    1. Re:Milli-pascal? by Anonymous Coward · · Score: 5, Informative

      What's he trying to say is that those units should be MPa (capital M and capital P) for both.

      Also most steels are above 400 MPa (some as high as 1800) so this isn't that strong, in fact Aluminum alloys can reach into the 400 MPa range.

      Cast Iron (in its 2 major forms grey & white cast) is very brittle and therefore does not have good tensile strength. However compressive strength and its good vibration tolerance is why a lot of large machining equipment uses a cast iron base.

  4. Papery by Deltaspectre · · Score: 5, Funny

    It's just like irony but stronger

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  5. awesome - shredproof paper! by Tumbleweed · · Score: 5, Funny

    Perfect for government documents and voting machine audit results. :)

  6. 1.6 times by Anonymous Coward · · Score: 5, Insightful

    over 1.6 times the tensile strength of cast iron Considering that cast iron isn't particularly renown for its tensile strength, being 1.6 times stronger isn't that impressive.
  7. Oh, great... by professorfalcon · · Score: 5, Funny

    This is going to mess up so many games of Paper, Rock, and Scissors.

  8. Re:Don't they realize... by Garridan · · Score: 5, Informative

    Oops, just RTFA'd. They didn't show that paper was as strong as paper. They made paper twice as strong as old "high strength" paper. Which still has very, very little tensile strength. Comparing to cast iron really doesn't help their case.

  9. Re:Great, but is it fireproof? by Spy+der+Mann · · Score: 5, Funny

    Or treatable to be fire-resistant?

    I can see a lot of uses for it even if it isn't. But I can see some fairly awe-inspiring ones if it's possible. Guy 1: BWAHAHAHA, BEWARE my super-robot made with nanopaper! It's stronger than steel!
    Guy 2: *lights match*
    Robot: *FWOOOM*
    Guy 1: :(
  10. hang on! by H0D_G · · Score: 5, Funny

    Wait, so paper beats scissors now?

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  11. Re:First! by serviscope_minor · · Score: 5, Informative

    wood has the highest tensile strength of any building material known to man based either on weight or cross sectional area.

    No, steel does. That's why I-beams are steel, not wood. It's also why the cables in suspension bridges are steel, not wood poles.

    Not a lot of our building techniques rely primarily on tensile strength, most rely on spanning gaps with weight bearing members.

    And what determines how well you can span a gap? A combination of compressive and tensile strength. You need to revise your beam bending...

    Tensile strength does come into play on collapsing structures, as weight bearing members are removed, and buildings end up hanging from their walls or rafters.

    So what does some in to play? Probably a mixture of tensile and compressive strength, depending on what is failing and why.

    --
    SJW n. One who posts facts.
  12. Re:Which is not much... by strength_of_10_men · · Score: 5, Funny

    but where does this leave me?

  13. Does this mean better, more useful origami? by master5o1 · · Score: 5, Funny

    Like Paper Construction Cranes?

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    signature is pants
  14. What is Tensile Strength by mrcaseyj · · Score: 5, Informative
    serviscope_minor wrote:

    icebike wrote:

    wood has the highest tensile strength of any building material known to man based either on weight or cross sectional area.
    No, steel does...
    There seems to be some confusion about what tensile strength is. Tensile strength is how well a material can resist pulling, not bending or compression. A rope can show off the tensile strength of a material even though it has no bending strength or compression strength.

    Even when adjusting for weight, the tensile strength of wood isn't so great compared to S-glass or carbon fiber. And when adjusting for cross sectional area, the tensile strength of wood fares even worse because it has a lot of air in its pores.

    1. Re:What is Tensile Strength by mrbluze · · Score: 5, Funny

      There seems to be some confusion about what tensile strength is. Tensile strength is how well a material can resist pulling, not bending or compression. Exactly, for example, ordinary toilet paper has poor tensile strength, resulting in many a brown finger for some. Let's hope this will stop with our new, stronger-than-steel paper. On the downside we may expect a few more red fingers.
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  15. Re:cast iron? by plover · · Score: 5, Informative
    Cast iron's not exactly dead. It's still good for producing relatively intricate parts cheaply. As long as you don't require high accuracy on every surface, you can have a really complex part that's only somewhat more expensive than the scrap iron that goes into it.

    Think of a thin stationary engine housing with fins to dissipate heat -- you usually don't care if the fins are within 0.25" of where they're supposed to be; as long as air can pass over them they can do their job. As far as the important surfaces, such as the ones that hold the bearings or that mate with another housing, sure, you'll have to machine those. But if you had to machine all those fins from a solid steel block, or cut a bunch and weld them all on, you'd easily spend three times the money on labor and tooling and have a part that doesn't last as long as a casting.

    There are many different alloys of cast iron, and they each have their own set of properties. All are much harder than ordinary steels, and usually have excellent wear resistance. Some alloys allow for more intricate castings. Some are easier to machine. And some, such as white iron, are extremely brittle and almost worthless in tensile strength, but can be treated to crazy levels of hardness. It all depends on your application, and in which properties you require. Steel can't simply be "dropped-in" as a replacement material. Hell, sometimes you can't even substitute ductile cast iron for malleable cast iron.

    And I wouldn't count on being able to substitute paper for cast iron, either!

    --
    John
  16. Re:First! by Vectronic · · Score: 5, Funny

    "Ever tried writing on iron? Not as easy... and folding it to put it in your pocket tends to be difficult."

    However, if you etch a piece of metal, you can use it as a stamp to create numerous copies of the etching, and when you hit severe writers block, its much easier to kill yourself with a piece of tin than paper cuts.

  17. Not really news by Attila · · Score: 5, Funny

    Anyone who has ever used a public toilet in Sweden would know that this has been in development for some time.

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