A MAN IN HIS WORKSHOP RECREATED THE HEAT SHIELD MATERIAL THAT CRACKED ON NASA'S ORION - AND REPRODUCED THE FAILURE

This is not a weekend build — it is a materials experiment that needs an oxyacetylene torch, a milled copper sample holder, embedded thermocouples, a data logger and a lot of careful mixing. polymatt usually repairs old laptop shells and the like; this video, published 11 September 2026, recreates the heat shield problem NASA found on Artemis I. When Orion came back from the Moon, chunks of its ablative shield tore away. NASA traced the cause to the skip entry: the capsule dipped into the atmosphere, lifted back out, then came in again, so the heating was gentler and more drawn out than a continuous plunge. That left the char less permeable, so pyrolysis gases forming underneath had nowhere to escape, pressure built, and pieces fractured free. polymatt mixed NASA's published ingredients (epoxy, milled glass, phenolic microballoons), packed them into resin-printed honeycomb coupons with three thermocouples at different depths, then torched them in a copper holder with a continuous burn and a skip-entry profile (one minute on, one off, one on). The skip-entry coupon shattered; the longer continuous burn stayed intact. He is open about the limits: residual heat in the copper holder between runs, and no way to simulate pressure or a shock layer. The point worth understanding is that an ablative shield is supposed to be destroyed — it carries heat away by charring and shedding — so the question was never whether it degrades but how. The one thing most likely to go wrong if you try this: a mix with air pockets, or a rig that preheats the next sample. This is a phenomenal watch; it is not a practical build for most makers.