Historically, sanitary ware was made of porcelain. This is a fairly advanced material...Historically, sanitary ware was made of porcelain. This is a fairly advanced material...Historically, sanitary ware was made of porcelain. This is a fairly advanced material...Historically, sanitary ware was made of porcelain. This is a fairly advanced material...Historically, sanitary ware was made of porcelain. This is a fairly advanced material...Historically, sanitary ware was made of porcelain. This is a fairly advanced material...Historically, sanitary ware was made of porcelain. This is a fairly advanced material...Historically, sanitary ware was made of porcelain. This is a fairly advanced material...Historically, sanitary ware was made of porcelain. This is a fairly advanced material...Historically, sanitary ware was made of porcelain. This is a fairly advanced material...Historically, sanitary ware was made of porcelain. This is a fairly advanced material...