P is spraying type, B is stirring type, and C, A, N A and N respectively identify cationic, anionic and nonionic emulsified asphalt. PC-2 stands for slow crack spraying cationic emulsified asphalt. You can buy a construction specification and have a look. Code for Construction and Quality Acceptance of Urban Road Engineering (cjj1-2008), page 65. Want to know more, buy JTJ052 "Test Specification for Asphalt and Asphalt Mixture in Highway Engineering".