Epalyn and Butyl are both known for being high quality materials used for the containment of water in garden ponds. The flexibility of Epalyn and Butyl means they can be readily manipulated into various shapes and sizes. They are both durable and stable at extreme weather conditions, UV resistant and can be readily repaired if required.
The technical difference between Epalyn and Butyl is the polymer. To be called Butyl the sheet must contain more than 50% butyl polymer. The polymer is the ingredient that makes the sheet elastic. In most pond grade Butyl there is usually a percentage of EPDM polymer mixed in. Epalyn, however is made with 100% EPDM polymer. EPDM polymer is more readily used around the world in a range of industries as it is generally cheaper.
Epalyn has a higher specification than Butyl.