What is Hard Roc Glass?

All JSG Oceana vessel sinks, decorative tiles, and glass home decor products are fashioned from JSG Oceana’s own “Hard Roc” glass formulation. 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 (commonly used in designer glass products) JSG Oceana’s “Hard Roc” glass is highly resistant to chemical corrosives and can be cleaned with any commonly used household or commercial strength product. JSG Oceana glass therefore will NOT become cloudy or rust marked over time.

“Hard Roc” glass perfect for use in glass home decor, tabletop products such as dinnerware and servingware, giftware, and even glass products for outdoor living, such as tabletops, stepping stones, and planters.  Other creations include floor tiles, vessel sinks, decorative tiles, flooring medallions, cutting boards, and decorative bowls, all of which and more are available as JSG Oceana Glass products.
 
Learn more on our Products page, or by visiting your area of interest: Kitchen & Bath products, Tabletop & Giftware, or Outdoor Living.  For business, we offer quantity orders that can be etched or monogrammed, even signage developed with your logo in glass!  Visit our Corporate Giftware page to learn more

Hard Roc vs. Soda Lime Glass

The most common designer glass available, and still widely used, is soda-lime glass. It is inexpensive to produce and until the development of JSG Oceana’s “Hard Roc” formula would have been the glass of choice for applications such as decorative vessel sinks.

Today, JSG Oceana’s “Hard Roc” glass sinks provide the consumer with many advantages in durability and functionality.

• JSG Oceana “Hard Roc” glass products will not crack or develop lines from hot and cold water usage like soda-lime glass products. JSG Oceana “Hard Roc” glass can withstand repeated temperature changes between 0° and 212° F without damage. “Hard Roc” glass has a low coefficient of Expansion, 3 times less than soda lime glass. This makes it useful for cooking, heating and other thermal environments, without the risk of breakage due to thermal shock. This is the main reason that JSG Oceana is the only glass kitchen sink on the market.
• JSG Oceana “Hard Roc” glass is stain resistant. “Hard Roc” glass is highly resistant to non-fluorinated chemicals thus allowing it to keep its lustrous color and clear quality. Soda-lime glass has only fair resistance to chemical corrosives and over time becomes cloudy from household cleaners and rust marked from hard water.
• JSG Oceana “Hard Roc” glass is more scratch resistant than soda-lime glass, making it the glass of choice for products such as stepping stones, floor tile, vessel sinks, decorative tiles, flooring medallions, cutting boards, decorative bowls, and more.
• JSG Oceana “Hard Roc” glass is in liquid form as it is poured into a mould, because the mould gives the shape to the glass sink the sink sits on your counter without rocking. Soda-lime glass sinks are slumped causing them to have an uneven bottom which requires the use of a mounting ring on the counter.
• JSG Oceana “Hard Roc” glass sinks are all IAPMO approved. IAPMO (International Association of Plumbing and Mechanical Officials) is an agency that evaluates plumbing and mechanical products through nationally recognized standards and to the requirements of the Uniform Plumbing Code ™ (UPC ™). All JSG Oceana sinks went through the same rigorous tests as porcelain and surpassed them.

JSG Oceana’s “Hard Roc” glass enables us to produce a wide variety of Glass Home Decor Products, including the only Glass Kitchen Sink on the market. Hard Roc glass is Durable and Easy to Clean, and you can see many examples of its stunning use in our Glass Photo Gallery.

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