ASTM C1208/C1208M-99a Standard Specification for Vitrified Clay Pipe and Joints for Use in Microtunn
C1208/C1208M-99a Standard Specification for Vitrified Clay Pipe and Joints for Use in Microtunneling, Sliplining, Pipe Bursting, and Tunnels
http://www.astm.org/cgi-bin/SoftCart.exe/DATABASE.CART/PAGES/C1208C1208M.htm?L+mystore+ifma3146.