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.
It depends on the local office. It usually takes about 90 days to get the permit, but if the interview is scheduled before that, you may not get it unless for some reason you are not able to be approved for your green card at the interview. The work permit is usually issued within 90 days of filing the application.