Dear Raju,

First of all, you need to find the suitable pressure regardless the thickness. To do so:

1- make few pellets using different values of pressure.

2- calculate the green density of the pellets.

3- draw a graph using the pressure in the x-axis and the green density in the y-axis. You will notice that when the pressure is increased the green density will also increase till it reaches almost a constant value (the highest green density).

4- The suitable pressure is the minimum pressure that produces a pellet with green density close to the highest green density without cracks.

Once you find the suitable pressure, you can prepare new set of pellets using the suitable pressure and different amounts of the powder. Again, you can draw a graph between the amount of the powder on the x-axis and the thickness on the y-axis. you can use this graph to estimate the required amount of powder for any desired thickness.

Please note that binders and/or lubricants may be needed to obtain pellets with high green strength and free of cracks.