The main function of a piston ring is to seal the combustion chamber so there is minimal loss of gas to the crank case. It also helps in improving the heat transfer from the piston to the cylinder wall. A piston ring is made out of cast iron as it easily adheres to the cylinder wall. Cast iron is also a material that can be easily coated with others to enhance its durability. The cast iron used in making piston rings is quite hard and brittle. A piston ring fits in the groove on the outer diameter of the piston in an internal combustion engine or steam engine. It also helps in maintain proper quantity of oil between the piston and the cylinder wall. eWorldTrade has a huge range of piston rings made by manufacturers from all over the world. Feel free to give them a look and connect with the manufacturer who meets your requirements and needs directly. eWorldTrade is a business to business portal that offers you some of the best services, wholesale rates and features. We are constantly looking to enhance our platform, so if you have any feedback, please let us know.