Epoxy is a term used to denote both the basic components and the cured end products of epoxy resins, as well as a colloquial name for the epoxide functional group.
Most green cards are valid for 10 years before you need to renew them. However, if yours was issued on the basis of your marriage to a U.S. citizen or a legal permanent resident, and the marriage is less than two years old, your card is only valid for two years.
Marriage to a U.S. citizen does not guarantee a green card or U.S. citizenship. Applications for U.S. green cards through marriage are scrutinized carefully, because the government takes fraudulent marriage very seriously.