pH of set MTA is:

Mineral trioxide aggregate (MTA) is composed of tricalcium silicate, tricalcium aluminate, tricalcium oxide and silicate oxide. Bismuth oxide is added to the mixture for radiopacity. pH - 12.5 (when set). Setting time is 2 hours 45 minutes. Compressive strength—40 MPa (immediately after setting) which increases to 70 MPa after 21 days.