Dry ice sublimates from solid CO₂ to gas, so its available mass changes before and during use. There is no universal loss rate for every container and route. Measure the actual configuration when estimating consumption, and keep coolant loss distinct from the product’s acceptable temperature history.
Define the mass observation
Identify the dry-ice form, container, loading arrangement and exposure period. Record whether an observation concerns storage before packing, a defined trial or material remaining at receipt. Those measurements answer different operational questions.
Use a documented, suitable measurement method under the site’s dry-ice handling procedure. Identify what is included in any gross reading so product, packaging and other coolant mass are not mistaken for solid CO₂.
Keep the comparison conditions visible
| Input | What to record |
|---|---|
| Initial material | Form and measured dry-ice amount. |
| Container | Exact construction and closure. |
| Exposure | Ambient conditions and elapsed period. |
| Handling | Openings or other events affecting the assembly. |
| Measurement | Method and what the reading includes. |
| Product | Separate temperatures and acceptance criteria. |
A comparison is useful only within the conditions it represents. Do not convert one warehouse observation into a fixed pounds-per-day rule for every shipping system.
Use measurements to investigate consumption
- Distinguish purchasing mass from packing allocation.
- Record elapsed time before dispatch.
- Identify relevant changes in form or container.
- Keep observations linked to the same configuration.
- Review uncertainty and unexplained differences.
- Assess repeated results before expanding an estimate.
Opening a trial container to inspect dry ice can alter its exposure. Plan the method so its effects are understood. Do not ignore the disturbance and treat the resulting trace as an untouched sealed trial.
Retain the product and safety decisions separately
Residual dry ice is supporting information, not proof that all product locations stayed acceptable. Review product-temperature evidence through the intended period and keep failed locations visible.
Helpful decision tools
Check the details before you choose packaging
These quick tools can help you compare route risk, sizing needs, coolant choices, and packaging details before you request a quote.
Dry Ice Calculator
Estimate dry ice needs for frozen or ultra-cold shipments before packing.
Estimate dry iceInsulation Material Reference
Compare insulation material choices for different cold chain packaging needs.
Compare materialsPackaging Selector
Compare insulated packaging options by product, route, and temperature need.
Find packaging49 CFR 173.217: carbon dioxide, solid addresses gas-release packaging for applicable US air and water transport. Do not obstruct the release path to reduce apparent loss.
CDC: dry ice exposure and ventilation documents enclosed-space CO₂ exposure hazards. Measurements and handling should use a suitable work environment and the relevant site procedure, rather than an improvised sealed enclosure.
Frequently asked questions
Can I use one loss rate for pellets and blocks in any shipper?
Do not assume so. Measure and compare relevant form, container and exposure.
Does zero remaining dry ice mean every product failed?
Product acceptance depends on its actual conditions and criteria; coolant depletion is a separate observation.
Does remaining dry ice prove a vaccine is acceptable?
No. Establish the exact product requirements and authorized assessment.
Connect the estimate to quantity and data review
Use the quantity study guide for supported loading and the temperature-evidence guide for interpreting product acceptance.
