Glycerine is a dense, odourless liquid byproduct of making biodiesel. While glycerine can be purified and refined for a number of commercial uses, including bases for soaps, machine lubricants and even explosives, the refining process is both tedious and inconvenient except in large batches. With this in mind, companies are searching for eco friendly ways of using and distributing the crude form of glycerine, and putting it into everyday use. One of these uses is homemade fire logs. There are only a few materials needed to make glycerine fire logs, and most are readily available.
Cut the top off the cardboard beverage cartons, and discard or recycle.
Fill the cartons with sawdust or wood chips. Lightly pack the chips into place. Leave about 1 inch of space at the top to make room for the glycerine when it is first added.
Heat the crude glycerine in a large stock pot over an open flame until it is just melted. It may be best to perform this chore outside, depending on what the glycerine was originally used for. Some sources of crude glycerine produce a chemical, oil-like smell when melted, which is undesirable indoors.
Pour the crude glycerine slowly over the wood chips or sawdust, a little at a time. With especially fine sawdust, it may take some time for the glycerine to soak through the mixture and into the bottom of the cartons.
Stir the mixture with a wooden spoon as needed to help incorporate the glycerine mixture into the wood.
Allow the glycerine logs to set up overnight before burning them.
Light the fire using conventional wood logs or kindling. Let it burn for a little while before adding the glycerine logs. Crude glycerine can potentially release toxic fumes if burnt at temperatures below 300 degrees Celsius.