Because of the adverse living conditions of the refugees in Darfur, Sudan the cardboard CooKit will not last much more than 6 months to a year (somewhat more durable CooKits in Kenya are reported to last up to two years). The need to have a durable Cookit has prompted us to develop one made of plastic polyproplyene flute board. Reflective aluminum polyester is attached to the surface before it is cut and formed. A local group of volunteers have begun to make these for introduction into Sudan 2008.
In February 2008, Stephen and Sheila Harrigan shipped 275 of these durable plastic CooKits to the Sakali Refugee Camp in Sudan. The Poly-Furnace is a cut down model of the Cookit made by Solar Cookers International.