b. Class II (Grade 20)--moderate level: Heavy-duty
sash with laminated or polycarbonate glazing; wood
sash must be reinforced or heavy.
c. Class III (Grade 30)--medium level: Heavy-duty
sash with laminated glass over 6 mm (1/4 inch) thick
or polycarbonate glazing 6 mm (1/4 inch) thick;
locks should include two heavy-duty deadlocking
bolts.
d. Class IV (Grade 40)--high level: Very heavy
fixed frames with laminated glass over 6 mm (1/4
inch) thick or security screen, bars, or shutters
with special locking devices.
e. Window performance requirements include lock
tests for stability (cycles of unlocking motion) and
strength (loads ranging from 218 N (49 lb. force) to
3350 N (753 lb. force); sash strength (218 N (49 lb.
force) primary and secondary loads to 445 N (100 lb.
force) primary load, 3350 N (753 lb. force)
secondary load) and impact resistance (not
applicable to Class I, Grade 10; other classes range
from one impact at 50 J (37 ft-lb force) to 10 at
100 J (74 ft-lb force)); and glazing impact test
(same as for sash impact).
5. Underwriters Laboratories Inc. (UL), "Standard
for Burglary Resisting Glazing Material," UL 972,
evaluates a glazing material's ability to withstand
multiple impacts over a wide temperature range.
Impact testing is standardized rather than
subjecting the specimen to actual physical attack
simulations by persons who can analyze and exploit
the weaknesses of specimens. A steel ball is
dropped a number of times from different heights.
The intent of this standard is to replicate
hit-and-run burglary attacks on commercial
establishments. This testing is at a level below
the "very low forced entry severity level."
6.
U. S. Department of State (SD).
"SD Std-01.01. This standard was developed for
determining the forced entry resistance of building
components to be used in State Department
facilities. The protection level is 5, 15, or 60
minutes. The tools are similar to the low forced
entry severity level. This standard is for the
testing of louvers, fixed windows and panels, and
doors. Testing is performed by a two-member team
for the 5-minute protection level and by a
six-member team for the 15- and 60-minute protection
levels. Penetration time is considered to be when
an opening has been created which allows passage of
either a solid, incompressible object 300 x 300 x
200 mm (12 x 12 x 8 inches) or a solid,
incompressible right cylinder 300 x 300 mm (12 x 12
inches). Both a forced entry and a ballistic rating
SECTION 11025
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