PPA in FR3: Two-Point Training Fit and Fluid Response

The problem addressed here is that mechanical retention alone cannot establish the insulating fluid's electrical condition. Cargill TR-610 reports PPA with 35% glass fiber at a baseline tensile strength of 29,041 psi, rising slightly to 29,390 psi after 2,000 hours at 170°C in FR3, and the analytic two-point proxy model reproduces both values by construction, projecting 29,921 psi at 5,000 hours. However, replicate scatter was not reported, so this apparent increasing trend is not statistically established, and the ±20% rate limits shown are illustrative scenarios rather than genuine prediction intervals. Separately, FR3 fluid aged alongside PPA measured a dielectric breakdown of 65 kV, compared to 74 kV for aged fluid-only control, but these are properties of the liquid itself, not the polymer.

There is no held-out validation and no ElastoSure software run behind these numbers, and no transfer between the electrical and mechanical properties has been demonstrated. Cargill FR3 is the actual fluid tested in this report, and the source is Cargill's 2015 technical report, Table 11, which is non-peer-reviewed.