ElastoSure Checked Against Independent ISO 9142 Hygrothermal Cycling Data for a Structural Polyurethane Adhesive

An independent, in-review (not yet published) study cycled a moisture-curing 1K-PU structural adhesive through ISO 9142 hygrothermal conditions (23°C/90% RH and 55°C/30% RH, alternating) for up to two 7-day cycles, measuring six mechanical properties plus glass transition temperature after each cycle. ElastoSure's fit/extrapolate/validate workflow was run: fit on the unaged and 1-cycle points, checked against the held-out 2-cycle measurement.

Karax's primary benchmark here is the full predicted-vs-actual stress-strain curve, not a single number, reconstructed from scalar data, not a literal digitized trace. That curve shows fracture strain falling 42%, the sharpest ductility loss of either pathway in the study, while yield stress first rises then partially relaxes, and glass transition temperature drops 10.45°C.

The source study reports only three time points, so this check rests on a single held-out point per property. Both ElastoSure and a simple linear baseline overshot the actual held-out curve here too, and by a wider margin than under isothermal aging; the white paper reports that directly.