I need to create a container which hold ~150 to 500 ml water. My plan is to create something like a inverse cone. I will apply pressure (~20psi) on the top of the cone and I want to create a hole at and only at the tip of the cone.
I plan to make the tip of the cone thinner, so that it will be easier to be break. However, I am new to plastic. Would anyone please give me some suggestion of material that I should use?