Summary of Analysis of Data

DOE-HDBK-3010-94

5.0 Surface Contamination; Summary

These values are based on the maximum experimentally determined ARF and

RF for a variety of cellulosic materials.

Median

ARF 5E-4/RF 1.0

Bounding

ARF 1E-2/RF 1.0

Uncontained Plastics. The following values apply to burning of unpackaged

contaminated combustible plastics.

all plastic materials except polystyrene: Based upon maximum

experimentally determined ARF and RF for polychloroprene and

polymethylmethacrylate:

Bounding

ARF 5E-2/RF 1.0

polystyrene: Based upon maximum experimentally determined ARF

and RF for a limited set of experiments involving polystyrene

contaminated with UNH solution. The value selected is based on

rounding upward the maximum value from the data set:

Bounding

ARF 1E-2/RF 1.0

Dispersed Ash Dropped into Airstream or Forced Draft Air. This ARF and

RF is not typically applied to burning masses of combustible material in even

large fires. It is applicable to extremely severe conditions where loosely

contaminated combustible material is driven airborne as part of an updraft

fireball. The material ignites and burns to substantial completion in the air

currents, with complete disintegration of the substrate, for these values to be

applicable. Such conditions are normally experienced by only a fraction of

material even under very severe conditions. The maximum ARF

experimentally obtained came from burning very small combustible specimens

with a sprinkling of fine powder contaminant. Directed airflows of 0.46 and

1.0 m/s were used to suspend the disintegrating combustible material to

maximize release potential. The ARF and RF assessed to be bounding for the

fraction of material exposed to these severe conditions are:

Bounding, loose powder

ARF 4E-1/RF 1.0

Bounding, air-dried solution or

ARF 8E-2/RF 1.0

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