The innovation of silicone ice molds was surely a welcome one ... so no transportation is needed while their contents are still in liquid form. This, of course, requires adequate clearance ...
Silicone is a useful material for many purposes ... The video also looks at creating molds for liquid injection and compression molding with putty. There’s also an example of eggshell molds.
Mould can be very difficult to remove from silicone sealant but there is a natural product that can do the job in 10 minutes ...