How to Use: Step 2

Preservation Evaluation

Guide to Environmental Ratings used by the Dew Point Calculator:

Natural Aging

TWPI Value (years)	Interpretation
≥75
45-75
≤45

Mechanical Damage

% EMC	Interpretation
≥ 5 AND ≤ 12.5
≤ 4.9 OR ≥ 12.6

NOTE: On the Dew Point Calculator, there is no "Good" rating for Mechanical Damage

Mold Risk

Days to Mold	Interpretation
No Risk
> 1 day to mold

Metal Corrosion

% EMC	Interpretation
≤ 7.0
≥ 7.1 and ≤ 10.5
≥ 10.6

Preservation Evaluation for the Dew Point Calculator

Explore the preservation consequences of environmental conditions with respect to Natural Aging, Mechanical Decay, Mold Risk, and Metal Corrosion.

Preservation Evaluation for the Dew Point Calculator:
The Preservation Evaluation assesses the preservation quality of the hypothetical storage environment plotted on the Dew Point Calculator.

Different Metrics:
Dew Point Calculator vs. Actual Datasets:
Because the Dew Point Calculator represents a single, static condition - with one temperature, one RH and one dew point - the metrics for its Environmental Ratings are slightly different than the metrics for an actual dataset, which integrate T, RH, and DP values as they change over a period of time.

Compare the metrics for the Dew Point Calculator and for actual datasets in the table below:

Type of Decay	Metrics Used for DP Calc	Metrics Used for Datasets
Natural Aging	Preservation Index (PI)	TWPI
Mechanical Damage	% EMC	Max % EMC Min % EMC % DC
Mold Risk	Days to Mold	MRF
Metal Corrosion	% EMC	Max % EMC

The metrics for the DP Calc evaluate a static condition; for actual datasets, the metrics have been adapted to integrate values of conditions as they change over time