Cold chain: difference between revisions
Diff·revision 44 → 45·04:55, 20 Feb 2025
Difference between revision 44 and revision 45 of Cold chain. 2 lines changed; the page grew by 285 bytes.
| Revision 44 — 22:50, 12 Feb 2025 CostPerMgCory (talk) add citation 18,483 bytes +506 | Revision 45 — 04:55, 20 Feb 2025 Chromatokid (talk) fix category — parent was wrong 18,768 bytes +285 | ||
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| 114 | Qualification is performed against standardised ambient profiles representing summer and winter conditions and including the transitions typical of air freight. ISTA Procedure 7D provides temperature test profiles for transport packaging, and ASTM D3103 gives a method for determining the thermal insulation quality of a package. Qualification establishes a duration — the time for which the package holds the payload within specification under the profile — and that duration is a property of the whole system, not of the insulation alone.{{r|ista7d,astm_d3103}} | 114 | Qualification is performed against standardised ambient profiles representing summer and winter conditions and including the transitions typical of air freight. ISTA Procedure 7D provides temperature test profiles for transport packaging, and ASTM D3103 gives a method for determining the thermal insulation quality of a package. Qualification establishes a duration — the time for which the package holds the payload within specification under the profile — and that duration is a property of the whole system, not of the insulation alone.{{r|ista7d,astm_d3103}} |
| 115 | 115 | ||
| + | 116 | {{note|A shipper's rated duration is conditional on the coolant conditioning, payload mass and ambient profile used in its qualification. A rating quoted without those conditions is not interpretable, and a shipper packed differently from its qualified configuration has no rating.}} | |
| + | 117 | ||
| 116 | === Phase-change materials === | 118 | === Phase-change materials === |
| 117 | Water ice melts at 0 °C and therefore holds a payload close to that temperature while any ice remains — well below the 2 °C lower bound of the cold range, and a recognised cause of freezing excursions in 2–8 °C distribution. Phase-change materials are formulated to melt at a temperature inside the target range, commonly around 5 °C for refrigerated shipments and around 22 °C for controlled-room-temperature shipments, so that the latent heat of the transition buffers the payload at a temperature that is itself compliant.{{r|pda_tr39}} | 119 | Water ice melts at 0 °C and therefore holds a payload close to that temperature while any ice remains — well below the 2 °C lower bound of the cold range, and a recognised cause of freezing excursions in 2–8 °C distribution. Phase-change materials are formulated to melt at a temperature inside the target range, commonly around 5 °C for refrigerated shipments and around 22 °C for controlled-room-temperature shipments, so that the latent heat of the transition buffers the payload at a temperature that is itself compliant.{{r|pda_tr39}} |