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Adhesive-bonded fastener secures aircraft

CLICK Bond, a leader in adhesive-bonded fastener systems, wanted to develop a bonded nut plate stand-off for the cargo doors of a major manufacturer’s new generation of commercial aircraft, so it turned to VICTREX PEEK polymer for the composite part.   

The stand-offs, which consists of a nut plate attached to a stand-off bracket, are used to provide support for the cargo doors as attachment points for the cargo door liner. 

"The high strength and stiffness of the VICTREX PEEK polymer combined with Click Bond’s innovative approach to adhesive-bonded stand-offs provides the necessary structural integrity while reducing installation labor," said Mark Egeberg, Click Bond Pacific regional manager. 

The use of adhesive to bond mounting hardware to the structure reportedly eliminates the need to drill/dress holes and install rivets.  

"Adhesive bonding is faster and also saves significant time and money should an attachment require relocation and rework is necessary¬because no holes are drilled," said Egeberg.   

In addition to reducing part count, eliminating rivet holes is said to reduce fatigue and corrosion potential. VICTREX PEEK polymer has replaced a glass/epoxy composite used on previous stand-offs.  

"Injection molding the part with VICTREX PEEK polymer is a good alternative to glass/epoxy composite especially when higher volumes dictate a production method with a much faster cycle time and lower part cost," said Egeberg.  

"The polymer provides the necessary properties required for structural attachments in aerospace applications including superior bond strength, high strength and stiffness, excellent flammability performance, and resistance to hydraulic fluid."  

Click Bond uses a unique self-fixturing process to maintain an accurate position on the substrate during bonding with a permanent structural adhesive. 

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