It's 2026 and industry still uses open flame for surface treatment of plastics. A viewer wrote in asking why — and specifically, what's the actual difference between corona (plasma) treatment and flame? The answer is more interesting than "one is better." Let me walk you through it.

⏱️ Chapters

00:00 It's 2026 and industry still uses fire

00:11 The viewer's question: what's the difference between flame and plasma?

00:17 Quick intro — Greg Friedman, plasma bioengineer

00:29 Corona treatment in the plastics and printing industry

00:39 What surfaces get treated: polyethylene, polypropylene, PTFE

00:48 The viewer's surprise: seeing methane flame used on polyethylene bottles

01:12 A colleague's story: three oxy-fuel torches pointing at a tube

01:22 Bottles fly through the flame before printing