What is Hard Roc Glass?
All JSG Oceana glass products, including our glass dinnerware, glass serving pieces, and glass giftware are fashioned from JSG Oceana’s own “Hard Roc” glass formulation. It’s what brings durability and elegance to our glass sinks, decorative tiles, and glass home decor products as well. Hard Roc is a unique form of borosilicate glass developed at Jeannette Specialty Glass. Borosilicate glass is the oldest glass known to show high resistance to sudden temperature changes. In fact, borosilicate is the glass of choice for refrigerator and oven cookware. It first came into commercial prominence when Corning marketed a type of borosilicate glass known as Pyrex. JSG Oceana’s borosilicate formula is specially designed to withstand the rigors that decorative sinks, tiles, and other home decor products can encounter. It is available in outstanding color variations and our sinks and tiles can withstand repeated temperature changes between 0° and 212° F without damage. Unlike soft soda lime (comm