MIL-STD-1330D(SH)
20 September 1996
Class C:
Air borne debris or contamination resulting from work accomplished in the controlled area shall be eliminated before redesignation as a controlled area. Depending on the time and work involved for a particular operation, a controlled area shall be one of the following:
(a) Clean space located or set up adjacent to areas which are non- contaminant producing.
(b) Clean tent or partitioned and covered area. The clean-tent shall be established by taping clean, unused, polyethylene plastic sheets in accordance with MIL-B-22191, type I, or equal, on the deck, overhead, and vertical areas for a distance of 3 to 4 feet around the area concerned. The outside surfaces of exposed materials within the confined area shall be cleaned to remove dust, oil, dirt, and other foreign material. Air movement within the confined area shall be held to minimum.
(c) Clean glove box or isolation box with a clean atmosphere. The glove box is a temporary enclosure surrounding the work area and sealed from the outside atmosphere. Work is accomplished through plastic gloves sealed to the box walls.
(d) A sleeve, with a clean, dry, nitrogen supply or equally clean, dry, air supply.
5.1.2 Maintenance.
Class A:
Class B requirements shall apply. Additionally, when specified, a particle count of the laminar flow benches and each clean area should be accomplished daily.
Class B:
(a) Complete cleaning and wipe-down of equipment, tools, workbenches, counters, table tops, and fixtures with detergent such as NID specified in 4.3.3, or commercial equivalent, and vacuuming and mopping of the floor shall be accomplished at the end of each 8 hours of operation and prior to use if greater than 24-hours has passed since the cleanroom was last used.
(b) Complete cleaning and wipe-down of the walls, floors, and ceiling with detergent such as NID specified in 4.3.3, or commercial equivalent, shall be accomplished monthly.
(c) The average air temperature and average humidity in a cleanroom shall be measured daily.
(d) Air filters shall be cleaned or replaced at regular intervals.
(e) Oil, grease, residue, spilled chemicals, and any foreign material
which develop in the area shall be cleaned immediately. Chips,
particles, and dust generated during any operation shall be
removed during the operation by vacuum.
(f) No eating, drinking, smoking, or personnel grooming is allowed.
Drinking fountains are permissible.
(g) Only oxygen approved lubricants as specified in 4.9 shall be stored
and used. Items incompatible with oxygen such as hydrocarbon oil
and grease and wood shall not be stored or used.
5.1.3 Temperature and humidity. The temperature and humidity ranges indicated are recommendations only. Exceeding the recommended ranges may result
in personnel discomfort, build-up of static charges if the humidity drops below 30 percent, or rusting of equipment and the enclosure if the humidity exceeds 50 percent. More stringent requirements may apply if other work, such as
calibration, is being performed.
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