Long Molecules: Polymers, Plastic Pipe, and the Realities of Recycling

Deep End Era. Engineering with Sankalp · Oct 28, 2026 · 55m

The pipe didn't burst. It crept apart, one molecule at a time, over thirty years. Priya Okonkwo and Henrik Voss (both fictional) work out why, and what that means for thousands of kilometres of plastic pipe and a procurement policy that wants recycled content. Along the way: why wax and milk jugs are the same chemistry, how a pipe can be given a fifty-year rating from a two-year test, why short branches on long chains made modern pipe possible, what pyrolysis really yields, and what "30% circular content" means on a brochure.

Chapters

00:00:00 Cold open: a crack that took thirty years…