<prompt> pH of freshly mixed MTA is:7.210.21112  <response>: 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.pH of freshly mixed MTA is 10.Setting time is 2 hours 45 minutes.Compressive strength40 MPa immediately after setting which increases to 70 MPa after 21 days. 