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Dry ice delivery

  • During shipping products under dry ice temeprature of samle inside parcel changes due to decrease of weight of dry ice. When parcels with dry ice are shipped to a country having delivery time 1 day (using FedEx), 1 and 1/3 of block of dry ice is put to the parcel (total weight of the parcel is 4 kg). Amount of dry ice is sufficient when the parcel is delivered even one day later than declared by FedEx.

Details

The sample was kept inside standard shipping parcel with polystyrene thermoinsulating blocks until temperature increased to -26°C (after 53 hours). At time zero, 2680g of dry ice in 2 pieces (1 and 1/3 of block) were put inside a parcel, together with a control sample of competent cells whose initial competency was 2.3 * 107. After 53 hours, the dry ice evaporated to a final weight of 306 g. Competency of cells kept inside the parcel was measured again and set to 2.0 * 107. The temperature inside the parcel was measured with temperature data logger SM 325 (Dickson, Addison, IL, USA), using thermocouple probe placed into a standard commercial paper box (together with a control sample of competent cells), in which competent cells are currently sold. Parcel was left at ambient temperature 24°C (+/-1°C) without movement excluding its weighing.
Sudden temperature changes on temperature curve were caused by movement of parcel due to weighing.

 

Plot

 

  • When parcels with dry ice are shipped to a country having delivery time 2 days (using FedEx), 1 and 1/2 of block of dry ice is put to the parcel (total weight of the parcel is 4.5 kg). Amount of dry ice is sufficient when the parcel is delivered one day later than declared by FedEx. When parcels with dry ice are shipped to a country having delivery time 3 days (using FedEx), 1 and 3/4 of block of dry ice is put to the parcel (total weight of the parcel is 5 kg).

Details

The sample was kept inside standard shipping parcel with polystyrene thermoinsulating blocks until temperature increased to -28.3°C (after 77 hours). At time zero, 3630g of dry ice in 4 pieces (1 and 3/4 of block) were put inside a parcel, together with a control sample of competent cells whose initial competency was 2.3 * 107. After 77 hours, the dry ice evaporated to a final weight of 292 g. Competency of cells kept inside the parcel was measured again and set to 1.5 * 107. The temperature inside the parcel was measured with temperature data logger SM 325 (Dickson, Addison, IL, USA), using thermocouple probe placed into a standard commercial paper box (together with a control sample of competent cells), in which competent cells are currently sold. Parcel was left at ambient temperature 24°C (+/-1°C) without movement excluding its weighing.
Sudden temperature changes on temperature curve were caused by movement of parcel due to weighing.

 

Plot

  • When parcels with dry ice are shipped by domestic services, delivery time 1 day with no delay is supposed. One block of dry ice is put to the parcel.

Details

The sample was kept inside standard shipping parcel with polystyrene thermoinsulating blocks until temperature increased to -22°C (after 53 hours). At time zero, a 2204g-block of dry ice was put inside a parcel, together with a control sample of competent cells whose initial competency was 2.3 * 107. After 53 hours, the dry ice evaporated to a final weight of 136 g. Competency of cells kept inside the parcel was measured again and set to 1.1 * 107. The temperature inside the parcel was measured with temperature data logger SM 325 (Dickson, Addison, IL, USA), using thermocouple probe placed into a standard commercial paper box (together with a control sample of competent cells), in which competent cells are currently sold. Parcel was left at ambient temperature 24°C (+/-1°C) without movement excluding its weighing.
Sudden temperature changes on temperature curve were caused by movement of parcel due to weighing.

 

Plot