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Storage Suitability

Collectively, the ISO standards for individual media contain seven different temperature recommendations. To simplify the evaluation and planning of storage conditions for mixed media collections, the recommendations below divides the range of possible temperatures into four categories: ROOM, COOL, COLD, and FROZEN.

The Four Temperature Categories

Four Temperature CategoriesEven though each of the four categories represents a range of temperatures, it is useful here to define ROOM, COOL, COLD, and FROZEN by single “anchor-point” values (It should be remembered that, in reality, the effect of temperature on decay rate is a continuum. The higher the temperature, the faster the decay, and vice versa.) Using the figure to the right and data gathered through an environmental assessment, you should be able to place your storage environment in one of these four categories. It’s very likely that your storage temperature is not precisely one of the four shown in the figure to the right. In this case, the following rules of thumb should help you decide where your environment fits:

  1. Any environment with an average temperature at or below 32°F (0°C) can be considered FROZEN.

  2. If your real-life average temperature is closer to one anchor-point temperature than another, simply apply the closer category. For example, if your storage temperature is 50°F (10°C), your environment would be considered COOL.

  3. If your average temperature is about equidistant from the temperatures on either side, consider both the cooler scenario and the warmer scenario when referring to the table below.

Suitability of Storage Environments for Film




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FilmCare.org is a web-based film resource created by the Image Permanence Institute, an academic research center devoted to research that informs the preservation of cultural heritage collections. The Image Permanence Institute is a department of the College of Art and Design at Rochester Institute of Technology (RIT).