Why refractories are essential in glassmaking Why refractories are essential in glassmaking June 3, 2020 Valerie Weber Monofrax is participating in its first webinar. Join Kevin Selkregg on Tuesday, June 9, at 3.00 pm BST (10 am EDT), as he explains why refractories are essential in glassmaking. June 3, 2020 Categories:News Tags:refractories, webinar