Synthetic Enamel, Interior, Undercoating, Smoke Grey For The System Of Interior Painting Of Coaches. Specification:- Is 133:2023(Sixth Revision) Including Optional Requirements Mentioned In Table 2 & 3 Of Is 133:2023(Sixth Revision), Isc:692 Conforming To Is 5:2007(Sixth Revision) (Reaffirmed Year 2022), Along With Rdso Amendment No. 1A(Rev. 1.0) As An Additional Requirement.