we divide according to size load capacity material and other factors. Some splits together some do not.
Some shelves may consist of several materials. Often wooden with iron frame. The shelves are wooden here and the solid structure is metallic. Another type is shelves and laminated shelves. Which can be washed easily. It depends on finances and also on the taste of everyone who orders these goods.
Washable materials include plastics. So laminates. Therefore this material is so often used. In all sectors. Washable coatings are another washable material. This material is mainly used in kitchens. For example on shelves shelves and the like.