Advanced Engineering 2018

Cabot Corporation Launches Treated Fumed Silica Cab-O-Sil Ultrabond 4740

07 February 2012

Cabot has launched a new technical solution for the bonding paste market that sets new industry benchmarks for performance, ease of use and manufacturing efficiency.

According to Cabot, the new particle, CAB-O-SIL ULTRABOND 4740, is a high-performance treated fumed silica for bonding past applications.  The most common use is the production of windmill blades for wind turbine generators. They say that adhesive bonding paste is critical to the manufacturing of windmill blades.  Typically, a windmill blade consists of two major pieces that are bonded together.  Today’s blades are up to 80 meters long and can weigh as much as 15 tons.  A strong bonding paste can prolong the life of a blade, and maximize efficiency and long-term performance. 

Cabot says their CAB-O-SIL ULTRABOND 4740 delivers 25 to 30 percent higher sag resistance (initial and aged), compared to current industry solutions.  This improved performance eliminates the need for bond paste customers to over-design current solutions to achieve stable sag resistance over time.

For bond paste customers, the new product also reduces the fumed silica content in the bonding paste formulation by 10-15 percent, providing important benefits of lower viscosity and easier applications over the blades.

Finally, Cabot explain that CAB-O-SIL ULTRABOND 4740 reduces fumed silica processing time by 50 percent during the manufacturing stage, compared to competitive products in the market.  They say this feature substantially reduces the total cycle time and creates the added benefit for customers in enabling production of more adhesives using the same assets on the ground. 

“We believe we’ve created a new industry benchmark for efficiency and performance with CAB-O-SIL ULTRABOND 4740,” said Valdemir Prodocimo, Global Segment Manager, Cabot. “We have developed this product with extensive input from our customers, industry bodies, institutes, and blade manufacturers across the world.  As a result, we’ve created a product that will help windmill blade producers meet the toughest requirements and deliver highest performance.”

Cabot’s line of hydrophobic CAB-O-SIL Fumed Silica, manufactured at its Tuscola, Illinois, US, and Barry, Wales, UK, sites.  CAB-O-SIL ULTRABOND 4740 is specifically developed for sag resistance and viscosity management of bonding pastes, and is available in 10 kg bags and 150 kg big bags.     

Cobot say that to maximize the potential of wind energy, the industry needs to manufacture longer wind mill blades, which are made possible through more resistant composites.

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