MIL-STD-1330D(SH)
w/ Change 1
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.
5.1.2.3 Class C.
a. Complete cleaning and wipe-down of equipment, tools, work surfaces, and fixtures with detergent such as NID specified in 4.3.3, or commercial equivalent, and vacuuming and mopping of the floor, if applicable, 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 controlled area was established.
b. Air filters, if installed, shall be cleaned or replaced at regular intervals.
c. Oil, grease, residue, spilled chemicals, and any foreign material which develop in the controlled area shall be cleaned immediately. Chips, particles, and dust generated during any operation shall be removed during the operation by vacuum.
d. No eating, drinking, smoking, or personnel grooming is allowed. Drinking fountains are permissible. e. 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.
5.1.4 Air filtration.
5.1.4.1 Type A. The best commercial practice employing items such as high efficiency particulate air (HEPA) filters shall be used to achieve and maintain the airborne particulate cleanliness level as specified in Table II, footnote 1/.
5.1.4.2 Type B. Outside and recirculated air shall be filtered to remove dust particles. Filter nominal rating shall be less than 10 micrometers.
5.1.5 Ventilation and air pressure.
5.1.5.1 Class A. The cleanest room should have a positive pressure of not less than 0.05 inches of water above the ambient pressure. A differential pressure of not less than 0.01 inches of water should exist between any enclosure within the cleanroom and any adjacent area of lesser clean requirements.
5.1.5.2 Class B. The ventilation air supply shall maintain a slight positive pressure so that the air flow will always be outward from the clean area.
5.1.5.3 Class C. Ventilation shall be employed as necessary to prevent the entry of contaminants from surrounding areas and to keep the concentration of any solvent in use not greater than its recommended exposure criteria. Fully contained uninhabited areas such as glove bags shall employ ventilation as necessary to prevent the introduction of contaminants.
5.1.6 Personnel clothing.
5.1.6.1 Class A. Strict control of personnel and their clothing is required to achieve and maintain a critical cleanroom. At a minimum, Class B requirements shall apply. Additional items such as full coveralls with hoods and booties, anti-static gloves, lint-free paper, and limitations on personnel with skin ailments and colds are generally employed. Refer to MIL-HDBK-407 for guidance in establishing the requisite additional personnel and clothing requirements.
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