Collectors have long seen melted-looking cable dents inside plastic cases of retro systems kept in storage. A new demonstration points to a chemical culprit—plasticizer migration—showing why wrapped PVC cables can slowly ruin ABS enclosures even when nothing g
For many retro collectors, the sight is painfully familiar: a cable-shaped indentation appears on the inside of a system’s plastic case, shaped like the lead that was once tucked away. It looks like heat damage. It feels like something went wrong.
But a recent video walkthrough by Run Stop Restored on YouTube argues the explanation isn’t thermal at all. The melted look comes from plasticizer migration—an entirely different kind of slow failure that can happen while equipment sits disconnected in storage.
Plasticizers are additives used in many plastics to make them flexible. and PVC in particular relies on plasticizers to achieve the properties it needs. In retro devices, the cable insulation—especially the flexible insulation used on many connections—often uses PVC. Over time. those plasticizers can migrate away from the PVC and into nearby plastics when they’re kept in close contact for extended periods.
That’s where the problem shows up in the cases. Many enclosures from that era—often ABS—are highly susceptible to receiving plasticizers. In the video demonstration. the cable is the long-term contact point: cables are typically wrapped tightly around the device they’re attached to. With solid contact maintained for months or years in storage. the exchange can gradually “inundate” the ABS case with the same type of plasticizers.
The result isn’t dramatic melting. Instead, the PVC insulation becomes brittle because it loses plasticizer. At the same time. the ABS enclosure can end up with the “melted” appearance—cable-shaped indents that look like softened plastic. even though the setup was never hot enough to cause actual melting.
Heat can speed the damage. Higher environmental temperatures accelerate the migration process, which is why the conditions around storage still matter even when the system is powered off and disconnected.
This is particularly significant for retro gear from the 1980s and around then—before phthalate-free plasticizer alternatives were developed and before more stable formulations arrived to reduce migration. The story here is chemical chemistry, not electricity.
Practical steps follow from that diagnosis. The video’s recommendations are direct: never wrap a PVC cable around a device. and keep flexible PVC insulation physically separated from susceptible plastics such as ABS as much as reasonably possible. A cool environment also helps slow migration and reduce the risk of ruining cases over time.
For collectors already facing damaged gear, the guidance also points to potential mitigation. Adding a coating can help, especially for protecting older equipment, but flexible PVC should still be treated with suspicion. In this case. prevention isn’t about being gentle with the hardware—it’s about breaking long-term contact that quietly changes the plastic itself.
The video can be watched here: https://www.youtube.com/watch?v=CONn2snfbpk
retro gaming retro gear plasticizer migration PVC ABS cable damage storage collectors chemical degradation
So it’s not heat but the plastic still kinda melts?? wild.
I knew my old console looked dented for a reason. I always kept the cables wrapped tight like that and now I’m like… so it’s basically chemistry ruining it? Great.
Wait so if it wasn’t hot, then why does it look like thermal damage? Sounds like they’re blaming plasticizer migration but maybe it was just people storing it in a garage during summer. Like yeah chemicals, but also heat.
This is why I hate storage totes. I don’t even mess with PVC cables wrapped up forever because I’ve seen the cable-shaped marks before. Now I’m picturing the plasticizer just slowly leaching into the ABS like it’s soaking up grease. Also half the time collectors don’t even know what cable insulation they have, so they’re doomed. Cool video though I guess.