Textile Rental
Tag life is quoted at a gentle reference wash. Raise the temperature fifteen degrees and a third of the population is gone before the rated count.
— %
Share of tags still working after the target wash count
A constant hazard rate is the simplest survival model and ignores early-life defects and end-of-life wear-out, both of which real populations show. Temperature and severity factors must be fitted from your own recovered-tag data — a tunnel washer with a press is a different world from a barrier washer, and the difference lands entirely in these two numbers.
Laundry RFID Tag Survival & Wash Cycle Predictor — free, with the formula and a worked example, at Textile School.