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Diamond Seal Face Technology


Next-generation Diamond Face Technology Extends Seal Life

On April 17, 2019, John Crane finalised the purchase of Advanced Diamond Technologies (ADT), Industrial Division. ADT is a leader in the development and application of diamond films for industrial, electronic, mechanical and medical applications.

ADT has unrivaled expertise in a proprietary family of materials that capture the properties of natural diamond. Broadly referred to as ultrananocrystalline diamond (UNCD®) technology, this product is a diamond material grown through a patented chemical vapor deposition process.

Diamonds have long been admired for their brilliance and strength. Although manufactured diamonds have been used for decades in cutting tools and abrasive applications, the difficulty of the manufacturing process to integrate real diamonds with other materials has resulted in the reduction of uptick to provide a consistent, reliable process that supports the production capabilities for our customers.

We recognize the advantages of using one of the Earth's hardest materials to improve mechanical seal reliability and performance in difficult applications involving poor lubricating fluids, liquids above their atmospheric boiling point and abrasive slurries. The technology’s extreme wear capabilities of diamonds enable treated seals to handle abrasive or erosive conditions more easily. In addition, UNCD has a low coefficient of friction which results in lower heat generation and energy consumption. For our customers, this means a significant increase in the mean time between failures when applied to mechanical seals, pumps and other industrial products.

Product Availability

John Crane Diamond ultrananocrystalline diamond (UNCD®) coated silicon carbide offers performance benefits for a wide range of applications in nearly every industry. Seal face treatments are available as an enhancement to many of our most widely used John Crane seal families such as:

T5600 Universal Cartridge Seal Family
T5800 Slurry Seal Family
48VBF Boiler Feed water Seal
Other High-Performance Sealing Solutions


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