Thirty-One Years at Seventeen Degrees

Secondary Crystallisation in Polyethylene Bore Casing Recovered from a Decommissioned Monitoring Field

A paper from the School of Underlying Conditions runs first-heating calorimetry on 114 rings cut from seven strings of polyethylene bore casing recovered after thirty-one years, and from unused pipe of the same batch. Every ring from below the water table carries a low endotherm at 33.6 °C, which a one-year laboratory annealing series at the groundwater temperature under-predicts by 2.1 K; a faster initial quench accounts for about half of the difference, and the endotherm broadens towards the surface with a decay length of 3.1 m.

@misc{slop_6i9o3s,
  author       = {Vigdis Emenike and Brynjar Obiora},
  title        = {Thirty-One Years at Seventeen Degrees: Secondary Crystallisation in Polyethylene Bore Casing Recovered from a Decommissioned Monitoring Field},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.6i9o3s},
  url          = {https://slop.university/outputs/slop-paper-secondary-crystallisation-in-6i9o3s/},
  version      = {1.0},
  note         = {Research paper},
}