Super Ice, Pykrete




Posted in WorkshopMolds-and-casting

Introduction: Super Ice, Pykrete

About: An electrical engineer who likes to make things.

This stuff is hard as concrete,kind of.

Step 1: What to Do

You can make this by freezing water and wood dust by weight 14% wood dust the rest water, but i didn't have any.
I used tissues, and toilet paper.

Step 2: How to Make

This is easy. Take tissues toilet paper ect. roll them into some kind of cylinder or ball, if you want pykrete like the arc don't squeez the water out, if you want the other kind squeez out as much water as you can, i have a video showing their strength on the next page.

Step 3: Strength

I wacked them with a hammer, a lot. Watch the videos. the first picture is the arc, the second is the ball thing.



    • Casting Contest

      Casting Contest
    • Make it Move Contest

      Make it Move Contest
    • Woodworking Contest

      Woodworking Contest

    We have a be nice policy.
    Please be positive and constructive.




    If you squeeze out the water before freezing, you change the proportion of water to fiber, so it's no longer 86% water to 14% fiber. Since these proportions account for the properties of Pykrete, the resulting material obviously won't have the same properties. If you want to make Pykrete, use the right proportions to start with, freeze it and do NOT squeeze out any of the water first.

    Has anyone thought to use the stuff in diapers in place of sawdust or tissues. If so how'd it work out?

    Here's a comparison when shooting pykrete v ice ;)

    Amazing stuff - there was actually plans to make a floating ice aircraft carrier in WW2. Using onboard refrigeration to keep the hull cold (but the wood slury acted as an insulation in itself). Would have been great -- fire at it as much as you want -- rebuild (with water) overnight :P

    10 replies

    Geoffrey Pyke made the plans- he was a mad scientist...

    I saw a show about the "weird weapons" of WWII. They actually made a prototype pykrete boat in a Canadian lake. If I recall correctly it took a year to melt, even with a warm summer.

    The prototype wasn't pykrete, just ordinary ice, and it did take a year to melt. Imagine how long a pykrete vessel would last!

    They didn't mold the whole boat at once. They actually made a bunch of bricks out of pykrete and put it together to make the aircraft carrier. They didn't make it completly out pykrete either, they only used it make the armor and hold the basic structure together.

    To be honest... not sure. But it seems plausible that they could make a tank and freeze it (perhaps in similar style to Hoover Dam?) Or in large chunks and then fuse the blocks together (similar to how warships are mfr'd)?

    I made some the way you did, it was stronger than usual, but i broke it with a hammer easily enough.

    when you broke yours, did it shatter? mine just smushes but i think it's because i squeeze out some of the water before freezing.

    I don't really remember, it was so long ago. Sorry.

    That was a pretty good episode, I never thought of using newspaper.


    Crack it open and read your fortune cookie slip =D

    i made this before, its awesome and i wacked with a sledgehammer alot too, after about 30 minutes of continuous whacking was it smashed... me and my friends have wars with them, we throw them at each other and, we have forts with extension cords to the house and refrigerators, and hoses to the water outlet. and continously make them! i got hit in the eye once it hurt like CRAZY

    1 reply

    I don't get it. Why couldn't you just throw rocks instead of going through the trouble of making pykrete just to throw it away?

    dude dats tight but wer u get wood dust?