The brake disc is generally a hat-shaped disc made of ductile iron, it is also rotating when the car is traveling. The brake caliper clamps the brake disc to produce braking force.
Gellan Gum is the extra-cellular polysaccharide produced by the gram-negative bacteria pseudomonas elodea that is separated from water lily,and is one of the microbia polysaccharides full of the development prospect in the recent years.