From the 2004 Instruction Redemptionis Sacramentum:
“[117.] Sacred vessels for containing the Body and Blood of the Lord must be made in strict
conformity with the norms of tradition and of the liturgical books.[205]The Bishops’
Conferences have the faculty to decide whether it is appropriate, once their decisions have
been given the recognitio by the Apostolic See, for sacred vessels to be made of other solid
materials as well. It is strictly required, however, that such materials be truly noble in the
common estimation within a given region,[206]so that honour will be given to the Lord by
their use, and all risk of diminishing the doctrine of the Real Presence of Christ in the
Eucharistic species in the eyes of the faithful will be avoided. Reprobated, therefore, is any
practice of using for the celebration of Mass common vessels, or others lacking in quality,
or devoid of all artistic merit or which are mere containers, as also other vessels made from
glass, earthenware, clay, or other materials that break easily. This norm is to be applied
even as regards metals and other materials that easily rust or deteriorate.[207]”
Footnotes:
[205] Cf. Missale Romanum, Institutio Generalis, nn. 327-333.
[206] Cf. ibidem, n. 332.
[207] Cf. ibidem, n. 332; Congregation for Divine Worship and the Discipline of the
Sacraments, Instruction, Inaestimabile donum, n. 16: AAS 72 (1980) p. 338.