How to Make Absorbent Water Crystals

Diapers have water-absording polymers that can be used to make water crystals.
••• babywindeln image by Daniel Fuhr from

Water absorbing crystals can absorb 30 times their weight in water. They are used in gardens or in neckties for athletes to use to keep cool. Also called hydrogels, water crystals are made by mixing three ingredients. The problem is that one of those ingredients is impossible to buy and difficult to make. Instead, use polymer powder found in baby diapers to make crystals.

    Place the diaper on the paper so that the inside faces up. Cut through the inside of the diaper with the scissors. Cut a long line or a big strip of the diaper.

    Pull out the cotton material that is inside the diaper. Put the material in the freezer bag. Try to get out every bit of the material from inside the diaper. Dump some out onto the paper if necessary. Fold the paper and use the folded middle as a spout to pour more of the material into the bag.

    Blow air into the bag and then seal it. It should look like a balloon with cotton inside. Shake the bag for several minutes. The polymer powder will fall from the material and rest at the bottom of the bag. Remove the cotton material from the bag.

    Put 1/4 teaspoon of the polymer powder in a bowl. Pour 1 cup of water into the bowl. The powder will absorb the water and become crystal shaped. Let the powder and water sit for at least 1 hour.

    Things You'll Need

    • Disposable diaper
    • Paper
    • Scissors
    • Freezer bag
    • Bowl
    • Water


    • Experiment with the amount of water used to make the crystals different sizes. Smaller crystals will absorb more water when used for gardens or neck coolers. Crystals that are large in size won't hold anymore water.

      The crystals can be dried in the sun. The sunlight will shrink them to a smaller size.

Related Articles

How to Dissolve Polyethylene
How to Make Water Polymer Balls at Home
How to Make Polymer Crystals
How to Make Crystals Grow Faster
How to Make Crystals with Epsom Salt
How to Make a Volcano for Kids Using Mud
How to Make a Sodium Silicate Solution
How to Remove Bee Propolis Stains
Hydrous Vs. Anhydrous
How to Make Your Own Styrofoam Formula
How to Make Homemade Glue Out of Milk for a Science...
How to Make Flubber Without Borox or Liquid Starch
Homemade Clear Liquid Plastic
How to Make Bouncy Putty
How to Make Potions for Kids
The Types of Cells Which Lack a Membrane Bound Nucleus
What Is Polyethylene Glycol?
How to Make Bromine & Chlorine Water
How to Make a Brick for a School Project
What Color Would a Tester PH Paper Turn if Is Dipped...

Dont Go!

We Have More Great Sciencing Articles!