From chicken feathers to fire retardant
Researchers at the University of Auckland have developed a way to turn chicken feathers into a high-performing fire retardant. Chicken is a popular source of protein in most parts of the world and millions of chickens are produced each year for us to eat – in New Zealand it’s estimated we each eat, on average, about 40 chickens a year. Billions of chicken feathers are produced by the poultry industry, most of which end up in the incinerator or landfill. Chicken feathers are, in short, an international waste problem. However, Distinguished Professor Debes Bhattacharyya of the Faculty of Engineering has found a way to use chicken feathers as a base for a fire retardant, one that is safer than many fire retardants, cheaper to produce, and solves an international waste problem at the same time. “People pay to get rid of chicken feathers,” he says. Chicken feathers are made of a keratinous material that is found in the hair, wool, horns and hooves of mammals. They are also naturally occurring flame inhibitors. Fire retardants are added to industrial and consumer products such as furniture, textiles, electronics, even Christmas trees, as well as building products such as insulation. Traditionally halogen compounds were added to create flame retardant material, but while they were effective they were highly toxic. “They might have saved you from death by burning, but have exposed people to many more effects that are detrimental to health. “Furthermore, as a result of the environmental long life and bioaccumulation, traces of the compounds have been detected in everything from household dust to breast milk, causing hormone-disrupting effects,” says Dr Bhattacharyya. As a result there has been a global shift away from halogenic retardants and toward other types of retardants among which ammonium polyphosphate (APP) is the most prominent. However, as […]