The chemical content which is present in the walls of cork cells is suberin which makes the water and gases of the cells impermeable. ... The fatty substances that are deposited in the epidermal cell walls are called cutin and waxes. Both of these together form a waterproof outer layer which is known as the cuticle.

Where is Cutin found?

Cutin, which is composed of hydroxy and epoxy fatty acids, occurs on almost all aerial parts of plants, including stems (except the bark), leaves, flower parts, fruits, and seed coats.

What do cork cells contain?

A mature cork cell is non-living and has cell walls that are composed of a waxy substance that is highly impermeable to gases and water called suberin.