Still Welding Strong: Leister DIODE Since the 1980s

Author: Roberto Bonaventura, Marketing Specialist, Leister Technologies Italia S.r.l.  

 

Craftsmanship That Lasts Generations

Bertolesi Srl, a family-owned business now in its third generation, has been shaping the plastics industry in Italy for decades. From fume scrubber towers to custom tanks and reservoirs, their expertise in thermoplastic fabrication is backed by a powerful legacy. 

At the heart of their workshop in Segrate, near Milan, you’ll find both state-of-the-art Leister equipment like the FUSION 3C extruder and a true classic: a Leister DIODE hot-air tool from the 1980s. Still running smoothly after more than 40 years, this tool stands as a testament to Leister’s promise of premium Swiss-engineered durability. “We’ve always relied on Leister, and we’re very satisfied with this long-lasting partnership”, says Claudio Bertolesi, CTO, Bertolesi Srl. 

 

Built to Last – Then and Now 

Though the vintage DIODE bears the patina of time—faded logos, a few scratches—it still delivers clean, strong welds every day. That kind of longevity is rare, and for Bertolesi, essential. In industrial environments where downtime is costly, a dependable tool is more than a convenience—it’s a necessity. This enduring performance is no coincidence. Leister designs every product with durability in mind, built for intensive, daily use in demanding environments. 

 

Performance That Grows With You

While the DIODE handles daily welding work with quiet persistence, newer Leister models like the FUSION 3C add power and precision to more demanding applications. This blend of legacy and innovation allows Bertolesi to meet diverse customer requirements while keeping processes efficient and dependable. “The DIODE still runs perfectly after more than 40 years. That’s Leister quality in action.” — Claudio Bertolesi 

Shared Values: Reliability, Precision, Partnership 

For Leister, partnerships like the one with Bertolesi are more than business—they’re collaborations based on shared values: trust, quality, and long-term commitment. 

We’re proud that our tools are part of Bertolesi’s journey. Because just like in the 1980s, we believe that great tools don’t just last—they inspire confidence, every day. 

 

The DIODE Evolution: Meet the DIODE S 

The success of the original DIODE lives on in today’s Leister DIODE S—a compact, high-performance handheld tool for industrial use: 

• Powerful and lightweight: 1600 W at just 0.46 kg 
• Adjustable temperature: From 20 °C to 600 °C 
• Precision control: Infinitely variable via rotary knob 
• Flexible in use: Can be combined with external blowers (e.g. MINOR, ROBUST) 
• Swiss Engineering: Built to Leister’s renowned standards of quality and performance 

 

Whether for modern fabrication or fine repair work, the DIODE S brings the same durability and reliability—with even more ergonomic power. 

 

Experience Performance That Endures 

Ready to upgrade your toolbox with Leister quality? Discover our latest generation of handheld tools—including the modern DIODE S—designed for professionals who need performance they can count on.