Fibers Science Olympiad Latest Version Graded A+

Fibers Science Olympiad Latest Version Graded A+ Cotton Vegetable -Most commonly used plant fiber, short fibers -steady flame, smells like burning paper, leaves a charred, whitish ash -irregular twisted ribbon Wool Animal -Most commonly used animal fiber -shrivels, brown-black residue, smells like burning hair -cylinder with scales Silk Animal -smoother than wool -shrivels, leaves black residue, smells like burning hair -thin, long, smooth cylinder Linen Vegetable -fibers generally longer and smoother than cotton -burns at a constant rate, doesn't produce smoke, smells like burning grass, produces sparks -smooth, bamboo-like Nylon Synthetic -long fibers -curls, melts, black residue, smells like burning plastic, ignites only when brought into flame -fine, round, smooth, translucent Spandex Synthetic -can stretch to eight times its original length -melts quickly -flattened, ridged fibers, clustered Polyester Synthetic -fibers can be any length -melts, only ignites when in flame, drips when it burns and bonds to any surface it drips on, produces sweet odor, and hard, colored ash. -completely smooth cylinder