Packaging MAP Calculator

The model treats any O₂ above a 2% baseline as actively promoting oxidation and aerobic spoilage, so the O₂ factor term in the code shrinks by 3% for every percentage point of O₂ past that threshold. This means even a high-O₂ mix designed for red meat color retention (70-80% O₂) trades away oxidative shelf life for the color benefit, a tradeoff the model makes explicit rather than hiding inside a single number.

Carbon dioxide is far more soluble in the product's water content than oxygen or nitrogen, so a meaningful fraction of your CO₂ fill actually dissolves into the food over time, modeled here with a Henry's-law-style solubility coefficient, shrinking the headspace volume that's left. The calculator reports this as a collapse-risk percentage, and once it climbs above roughly 30% the fix is to shift the gas mix toward more nitrogen or less CO₂ rather than accept a visibly collapsed, consumer-unappealing package.

This output estimates how long the initial oxygen in the headspace will last against a product's own respiration, using a model where respiration roughly doubles for every 10°C rise in temperature. It's only meaningful for products that are still biologically active and consuming oxygen after packaging, like fresh produce — a packaged, non-respiring product such as cooked poultry won't deplete its own headspace O₂ this way.

No, it's an empirical multiplier model built from known microbiology (CO₂ suppresses microbial growth, low O₂ slows oxidation) applied to whatever base in-air shelf life you enter, not a validated challenge-study result for your specific product and packaging. Use it as a directional planning tool for comparing gas mixes, and confirm any final shelf-life claim with real challenge testing before it goes on a label.