GGG-H-211.D
Type I helmets.
3.9
3.9.1 All classes.
3.9.1.1 Warpage resistance. Helmets shall be constructed so as to be resis-
tant to warpage without a change in the original dimensions of more than 2.0
percent (see figures 1, 2, and 3) when tested as specified in 4.2.4.4.
3.9.1.2 Headgear. The headgear shall retain the helmet. comfortably and
firmly in place on the wearer's head, and shall be so constructed that-the hel-
met may be tilted back over the head. The headgear shall be adjustable so as
to permit positioning of the style a and style c plates in the line of vision
of the wearer. The contractor shall certify that these requirements have been
met.
3.9.1.3 Sweatband. The headgear shall be fitted with a removable and re-
placeable sweatband covering at least the forehead portion of the headband. The
sweatband shall be made of leather or other material which is slow burning,
non-irritating, and non-allergenic to normal skin. The contractor shall
certify that these requirements have been met.
3.9.1.4 Headband. The headband shall be readily adjustable to various head
sizes without the use of tools, and shall hold firmly without slippage after
being adjusted. Adjustment shall be by means of a positive locking arrangement
or ratchet adjustment type. Adjustment mechanism and movements, together with
that portion of the band over which the ends travel, shall be continuous (not
stepwise) and shall be enclosed within a sleeve or shall be otherwise protected
to prevent snagging the hair while wearing or making adjustments. The con-
tractor shall certify that these requirements have been met.
3.9.1.5 Chin rest or position stop. Helmets shall be provided with either a
chin rest or position stop. Chin rest shall extend inside the helmet, across
the bottom, and shall be thermally nonconductive. The strip shall be arched to
provide additional strength. The chin rest shall be connected to the helmet in
such a manner that it may be adjusted to position the helmet in front of the
face. An adjustable position stop in lieu of chin rest is acceptable, provided
it performs the same function as the chin rest. The contractor shall certify
that these requirements have been met.
3.9.2 Class 1, fixed front. The helmet shall be fitted with a style a plate
mounting with a clear opening no less than 41 mm high and 92 mm wide that will
hold the style a and style b plates securely and firmly in place. Plate mount-
ings shall be such as to permit, without the use of tools, the removal and
replacement of plates without damage to the plates or mounting. The mounting
frame may be of metal or thermosetting or therm-plastic material. The mount-
ing frame shall be securely mounted to, or form an integral part of, the helmet
or handshield. Insulation requiring removal in order to replace plates shall
not be used. The contractor shall certify that these requirements have been
met.
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