Most varicose and spider veins appear in the legs due to the pressure of body weight, force of gravity, and task of carrying blood from the bottom of the body up to the heart. Compared with other veins in the body, leg veins have the toughest job of carrying blood back to the heart. They endure the most pressure.
Curing a thermosetting resin transforms it into a plastic, or elastomer by crosslinking or chain extension through the formation of covalent bonds between individual chains of the polymer. Crosslink density varies depending on the monomer or prepolymer mix, and the mechanism of crosslinking:
Concrete curing is a process in which the cement and the water in concrete bond and harden through a chemical reaction called hydration.As they bond, the cement and water bind the aggregate and the sand to form a strong foundation structure.Proper curing is critical to the strength and durability of concrete.oncrete curing is a process in which the cement and the water in concrete bond and harden through a chemical reaction called hydration.