So I reckon the ul.com pcb classification is this test
http://www.ipc.org/4.0_Knowledge/4.1...t/2.4.8.3a.pdf
with 10 second solder float for the heating stage
Then passing 260 degree C for leaded solder use
270 deg C for PbF
288 deg C for high spec like polyimide/ N7000-1 /Pyralux