U. L. FIRE
RESISTIVE RATING CLASSIFICATION
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THE
FOLLOWING IS AN EXPLANATION OF THE UNDERWRITER'S
LABORATORIES' FIRE RESISTANT CONTAINER TESTING
PROCEDURES ON THE CLASS 350°F, ONE AND TWO HOUR
FIRE LABELS.
U.
L. LABEL/CLASS 350°F ONE HOUR AND CLASS
350°F TWO HOUR
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THE
SAFE WILL MAINTAIN AN INTERIOR TEMPERATURE LESS
THAN 350°F WHEN EXPOSED TO FIRE FOR A PERIOD OF
ONE HOUR AT 1700°F OR FOR A PERIOD OF TWO HOURS
AT 1850°F. SAFE MUST SUCCESSFULLY UNDERGO
ALL OTHER REQUIREMENTS FOR THE FIRE ENDURANCE
TEST, EXPLOSION HAZARD TEST AND THE
FIRE IMPACT
TEST.
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| UNDERWRITERS
LABORATORIES TESTING PROCEDURES |
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| FIRE
ENDURANCE TEST |
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AFTER HEAT SENSORS AND PAPER
ARE PLACED IN THE SAFE, THE UNIT IS LOCKED AND EXPOSED
TO A UNIFORMLY DISTRIBUTED FIRE. THE FURNACE IS REGULATED
TO REACH A MAXIMUM TEMPERATURE OF 1700°F OR FOR A PERIOD
OF ONE HOUR, OR 1850°F FOR TWO HOURS, THEN ALLOWED TO
COOL WITHOUT OPENING THE FURNACE. THE INTERIOR TEMPERATURE
IS RECORDED THROUGHOUT THE TEST AND DURING THE COOLING
PERIOD UNTIL A DEFINITE DROP IS SHOWN AND MUST NEVER EXCEED
350°F.
ONCE COOLED, THE UNIT IS OPENED AND EXAMINED FOR USABILITY.
THE UNITS LOCKING MECHANISMS AND PARTS FASTENINGS ARE
EXAMINED FOR SECURITY AND THE INTERIOR EXAMINED FOR VISIBLE
EVIDENCE OF UNDUE HEAT TRANSMISSION. |
| EXPLOSION
HAZARD TEST |
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THE SAFE IS LOCKED AND PLACED
INTO A FURNACE PREHEATED TO 2000°F. THIS TEMPERATURE IS
MAINTAINED FOR 30 MINUTES (2 HOUR TEST IS 45 MINUTES)
AND IF NO EXPLOSION RESULTS, THE UNIT IS ALLOWED TO COOL
WITHOUT OPENING THE FURNACE DOORS.
ONCE COOLED, THE UNIT IS OPENED AND EXAMINED FOR USABILITY.
THE UNITS LOCKING MECHANISMS AND PARTS FASTENINGS ARE
EXAMINED FOR SECURITY AND THE INTERIOR EXAMINED FOR VISIBLE
EVIDENCE OF UNDUE HEAT TRANSMISSION. |
| FIRE
IMPACT TEST (MANUFACTURER'S
OPTION) |
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AFTER THE EXPLOSION HAZARD
TEST THE SAFE IS REMOVED FROM THE FURNACE AND WITHIN TWO
MINUTES IS DROPPED 30' ONTO A RIPRAP OF BRICK ON A HEAVY
CONCRETE BASE. AFTER IMPACT THE UNIT IS EXAMINED FOR DEFORMATION,
RUPTURE OF PARTS, DAMAGED INSULATION AND ANY OTHER OPENINGS
INTO THE INTERIOR OF THE UNIT.
ONCE COOLED THE UNIT IS INVERTED AND REHEATED TO 1550°F
FOR A PERIOD OF 30 MIN.
(2 HOUR TEST 45 MIN. AT 1638°F).
ONCE COOLED, THE UNIT IS OPENED AND EXAMINED FOR USABILITY.
THE UNITS LOCKING MECHANISMS AND PARTS FASTENINGS ARE
EXAMINED FOR SECURITY AND THE INTERIOR EXAMINED FOR VISIBLE
EVIDENCE OF UNDUE HEAT TRANSMISSION. |
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24
Hour Emergency Service Available |
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