The Reasons As For The Change Of Rubber Sheetings

Rubber variety, used in different conditions, changes that have occurred are also different.

Soft stick:

Hard brittle: Br's aging, aging of nitrile-butadiene rubber, styrene-butadiene rubber.

Crack: unsaturated rubbers ozone aging photo-aging, cracking, most shapes are not the same.

Moldy rubber aging biological organisms.

There is also: spots, cracks, whitening cream, powder spray, and so on.