About Us

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HJ3 Composite Technologies provides patented carbon fiber solutions for critical infrastructure applications worldwide. HJ3's composite systems offer superior strength and durability compared to competing products, and are supported by a team of design and application engineers who specialize solely in engineered composite repairs. Our promise to our customers is to offer same-day calculations and same-day shipping to support the critical nature of our customers' applications.

StrongHold™ Residential is the residential division of HJ3 Composite Technologies, LLC. StrongHold™ Residential brings HJ3's patented carbon fiber right to to your home, providing the same industrial strength that we use to repair bridges, tanks, and buildings in an easy do-it-yourself kit. From bowed and cracked walls and floors to crawl spaces, countertops, and so much more, we're on a mission to save homeowners 60-90% on your residential repairs!

HJ3, a Technology Transfer company from the University of Arizona, is independently owned and based in Tucson, Arizona. We won 3 National Titles in the 2013 CleanTech Open, including the People's Choice award, and have received national recognition from CNN, Fox Business, and the Discovery Channel. With 25 years of large-scale testing behind our products, and more than 100 published white papers, you can rest assured that HJ3 really is

The Strongest Name in Carbon Fiber.