What are the criteria for intact stability ?

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Refer IMO INTACT STABILITY CRITERIA

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The intact stability of all vessels other than grain carriers is as follows;
a. The area under the GZ curve up to an angle of heel of 30deg not to be less than 0.055 m-rad.
b. The area under the curve up to an angle of 40 deg or angle of deck edge immersion (Whichever is less) not to be less than 0.09 m-rad.
c. The area under the curve between 30 deg and 40 deg or angle of deck edge immersion (whichever is less) not to be less than 0.03 m-rad.
d. The righting lever at an angle of heel of 30 deg shall not be less than 0.20 m.
e. The maximum righting lever shall preferable occur at an angle of heel of 30 deg but in no case at less than 25 deg of heel.
f. The initial metacentric height corrected for free surfaces (GM fluid) not to be less than 0.15m

For grain Carriers when carrying grain:
a. The angle of heel due to the shift of grain is to be not greater than 12° or the angle at which the deck edge is immersed, whichever is the lesser
b. In the statical stability diagram, the net or residual area between the heeling arm curve and the righting arm curve up to the angle of heel of maximum difference between the ordinates of the two curves, or 40° or the angle of flooding, whichever is the least, is in all conditions of loading to be not less than 0,075 m.rad
c. The initial metacentric height, after correction for the free surface effects of liquids in tanks, as specified in Pt B, Ch 3, Sec 2, [4], is to be not less than 0,30 m.

For passenger vessels in addition to the general stability criteria, the following:
a. The angle of heel due to crowding of passengers on one side may not exceed 10deg.
b. The maximum heel due to vessel turning shall not exceed 10deg.