77 Ill. Adm. Code 890.1410
Materials
Section 890
Section 890.1410Â Materials
a)Â Â Â Â Â Â Â Â All piping and fittings used in the vent system shall conform
to requirements of Appendix A, Table A, "Approved Building Drainage/Vent
Pipe" and "Approved Standards for Fittings".
b)Â Â Â Â Â Â Â Â A system carrying corrosive waste shall be of approved
materials as in Appendix A, Table A, "Approved Building Drainage/Vent
Pipe". Vent piping shall be of the same material as the waste piping.
(See Section 890.1310(b).)