The Danger of Stretchwrap

Have you got it Covered, Week 6

Initial trials on Tyvek® covers in India had shown temperature differences of as much as 25°C between standard stretch-wrapped pallets and identical pallets cloaked with Tyvek® covers when both were subjected to solar radiation over a 3-day period. Similar measurements were subsequently repeated in many other geographical zones in Europe, Asia and the Americas.

In another Tyvek® qualification test, four pallets of pharma products, two using Tyvek® covers and the other two covered with standard plastic stretchwrap, were temperaturemonitored throughout a six and a half day door-to-door shipment from Brazil to France. This journey involved wide ambient temperature fluctuations from as low as 5°C to a peak of nearly 40°C.

In this particular test the Tyvek® pallets remained within the desired 15°C temperature envelope throughout the test whilst, in contrast, both the stretch-wrapped pallets rapidly breached the predetermined temperature band. In fact some temperature sensors positioned within the stretchwrap pallets indicated, alarmingly, ‘out of limit’ temperatures for periods exceeding 24 hours.

Click here to view Week 7 – Greenhouse Effects

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