The production date of the purchased tiles is four years.

Because there is no strict requirement on the shelf life of these things, people don't care much about their production date. As long as it is properly preserved, it can be used even if it is preserved for ten or twenty years.

Ceramic tiles are acid and alkali resistant building or decorative materials such as ceramics or stone, which are made of refractory metal oxides and semi-metal oxides through a series of processes. Collectively referred to as tiles.