Investigation of Fire Stop Test Parameters Final Report (NUREG/CR-2321)

On this page:

Download complete document

Publication Information

Date Published: September 1981

Prepared by:
Leon Przybyla

Underwriters Laboratories
333 Pfingsten Road
Northbrook, IL 60062

Sandia National Laboratories
Albuquerque, New Mexico 87185
operated by Sandia Corporation
for the US Department of Energy

Sandia Project Officer: L. J. Klamerus

NRC FIN A-1010

Prepared for:
Division of Engineering Technology
Office of Nuclear Reactor Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555
Under Memorandum of Understanding DOE 40-550-75

Availability Notice


An experimental investigation was performed to determine the effects of pressure differential, fire exposure conditions and sample construction on the performance of fire stops used to seal electric cable and conduit penetrations through concrete fire barriers. Experiments were conducted using a differential pressure of -12 to +125 Pa, various sample constructions and two fire exposure conditions. Results indicate that the effect of pressure differential is not significant for those fire-stop materials which do not have cracks or other through openings that allow passage of gases during fire-exposure. However, if the material allows passage for gases through cracks or other holes, such as those left open after a cable pull, the pressure differential affects fire stop performance. Effects of the size of the opening; size, location and type of the penetrating items installed through the opening; and severity of fire exposure on the performance of fire stops are demonstrated.

Page Last Reviewed/Updated Wednesday, March 24, 2021