Hesperian Health Guides

Chapter 61: Homemade Casting Materials

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HealthWiki > Disabled Village Children > Chapter 61: Homemade Casting Materials


Plaster bandages

Although commercial plaster bandages work best, they are very expensive. You can make homemade plaster bandages for as little as one tenth the cost. Or some of the disabled children can learn to make them. You will need:

Bag and can with plaster of paris.
  • plaster of Paris. If possible, a high-quality type such as dental plaster of Paris. Keep it in a tightly closed moisture-proof container.
Gauze cloth, arrows indicate strip of gauze cloth into bucket of laundry starch, gauze cloth hanging
  • gauze cloth or crinoline. Crinoline, which is a high quality open mesh cloth, works best. Good quality gauze can also be used. Holes should be about 8 to 10 per cm. (20 per inch). Cheesecloth also works, but not as well.

HOW TO PREPARE:

  • If you use gauze or cheesecloth, first dip it into a weak solution of laundry starch and let it dry. This helps the bandage keep its shape.
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Cutting gauze.
  • Cut the cloth into strips of the width you want.
Putting plaster powder on extended gauze.
  • Rub plaster powder into the cloth and roll or fold it loosely. Do not roll it tightly or the inner part will not get wet when dipped for use.

The most common problem is that the gauze does not hold enough of the plaster powder. Even if you put on a lot, some powder always falls out. The test is when you apply the wet bandage. As you rub each layer into the next, the threads of cloth should disappear into the smooth, wet, plaster surface. If not, there is not enough plaster and it will not set hard.

Suggestion: Have some dry plaster powder ready when you are casting. If needed, sprinkle a little powder over each layer of bandage and rub it smooth with wet hands. Add more to the final layer and rub it in to form a polished surface. Putting plaster powder while casting a leg.

Storage: Wrap the plaster bandages in old newspaper or plastic bags and store in an airtight container. Do not prepare too many at a time. They can absorb moisture and spoil.

Two hands squeezing rolled gauze.

CAUTION! When wetting for use, up to a third of the plaster may be lost in the water. To reduce loss, put bandage gently into water and then let it drip. If you squeeze it, hold the ends of the roll and gently squeeze toward the center.


Homemade plaster takes longer to get hard than commercial ‘fast-setting’ plaster. To speed up hardening, heat the water or add a little salt to it.

Casts made of wax

To prepare a mold of a leg for making plastic braces, the first (hollow) cast can be made of wax instead of plaster. Use either candle wax (paraffin) or beeswax. Wax can be much cheaper than plaster bandage, especially if the wax is re-used. To make a wax cast:
1. Melt the wax in a can placed in hot water. 2. Cut several strips of soft absorbent cloth.
Fire under pot with water, steam comes out of can inside of pot.
can with wax
pan with hot water
Strips of cloth.
3. Soak the cloth in hot wax. 4. When it has cooled enough not to burn, wrap the waxed cloths around the foot.
Tweezer sustains strips of cloth in can of wax.
Casted foot and leg with rope beneath cast.
rope

Note: Before putting on the wax, you can cover the foot with ‘stockinette’. Also, place a rope or strip of plastic along the top of the leg to make cutting the cast easier. (See "Making the plastic-bucket brace".)


5. While the wax is still warm and soft, rub and press it against the leg. 6. Hold the foot in the desired position until the wax hardens. (To speed hardening, you can put the foot in cold water.) 7. Cut the wet cast along the rope, and carefully remove it. Go on with the other steps as described for "Making the plastic-bucket brace"
person pressing cast tightly against child's leg.
leg with cast on in a bucket of cold water, foot flat on the ground and both ankle and knee bent at 90 degrees.
cold water

Re-using the wax: After the positive plaster mold has been made from the wax cast, the wax can be re-used. Heat up the pieces of waxed cloth and use them to form a new cast. Or boil the waxed cloth in water, holding the cloth under the surface with rocks or metal. The hot wax will rise to the surface. When it cools, lift it off and re-use it.

OTHER POSSIBLE MATERIALS FOR CASTING OR MOLDING

Many materials can be used for casts. Most have the disadvantage that they take a long time to harden. Possibilities include:

1. Papier mâché. Very slow hardening. Careful use of a heat lamp or ‘hair dryer’ speeds drying.
2. Traditional cast materials. For example:
  • In Mexico, the juices of certain plants, boiled into a thick syrup and soaked into a cloth, will harden into a cast (see Where There Is No Doctor, p. 14).
  • In India, traditional bone setters make casts using cloth covered with egg white mixed with flour.
3. Flour made from cassava (manioc) is also used in India to make casts.


To make the solid (positive) mold of a limb (see "Making the plastic-bucket brace"), ‘building plaster’ works well. (Wax cannot be used because it melts when hot plastic is placed over it.) Clay also works, but takes several days to dry.


This page was updated:19 Jan 2018