What type of natural oil found in polar bear fur was discovered in 2025 to have de-icing properties?

The natural oil found in polar bear fur, known as sebum, was discovered in January 2025 to possess remarkable de-icing properties. This oily substance, secreted by glands in the skin, coats the polar bear's fur and plays a crucial role in enabling these Arctic mammals to thrive in their extremely cold environment. While polar bears are known for their thick blubber and insulating fur, observations of their fur remaining ice-free even after emerging from freezing waters prompted scientists to investigate further.

An international study, published in Science Advances, revealed that the unique composition of lipids within polar bear sebum significantly reduces ice adhesion. Researchers conducted experiments comparing ice adhesion on washed and unwashed polar bear fur, finding that untreated fur performed as well as high-performance fluorocarbon coatings. When the sebum was removed, however, the ice adhesion increased fourfold, highlighting the oil's critical role.

The key to this anti-icing effect lies in specific lipids within the sebum, such as cholesterol and diacylglycerols, which exhibit very weak interactions with ice. Interestingly, the study also found a notable absence of squalene, a common lipid in the sebum of many other aquatic mammals, which tends to adhere strongly to ice. This discovery not only provides deeper insight into polar bear biology but also holds promise for developing sustainable, bio-inspired anti-icing solutions for various industries, potentially offering safer alternatives to current environmentally problematic chemicals.