Calculate a packout buffer before you ship
Calculate and interpret a thermal time buffer for a passive cold-chain shipment.
Passive shipper qualified for 96 hours. Planned route is 78 hours. Credible customs dwell can add 28 hours. Product must stay 2 to 8 C until controlled receipt. FMEA asks what failure mode appears if route time exceeds the packaging envelope, then selects controls that reduce likelihood, consequence, or detection gap. Common trap: calling 18 hours of arithmetic margin a real buffer while ignoring credible customs dwell and rescue time. Before 96-hour qualified shipper minus 78-hour plan equals 18-hour buffer. Approve passive packout. After 96-hour qualified shipper minus 78-hour route minus 28-hour credible customs dwell equals negative 10 hours. Passive…
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