Is a plastic bowl suitable for consecrated hosts?

No, a plastic bowl is not suitable for consecrated hosts (the Eucharistic bread) according to Catholic Church teaching. Sacred vessels for containing the Body and Blood of the Lord must be made in strict conformity with the norms of tradition and the liturgical books 1. The use of common vessels or containers lacking in quality, devoid of artistic merit, or made from materials that break easily, such as glass, earthenware, clay, or plastic, is reprobated 1. The norm also applies to metals and other materials that easily rust or deteriorate 1. Therefore, a plastic bowl would not meet the requirements for a sacred vessel to hold the consecrated hosts 1.