MIL---DTL---51194D(EA)
scfm. T h is flo w sh a ll be ma in ta in e d fo r n o t le ss th a n 1 min u te o r mo re th a n 2 min u te s. F iltra -
tio n e fficie n cy is ca lcu la te d a s fro m th e co n ce n tra tio n s o r p a rticle co u n ts a s fo llo ws:
Pe n e tra tio n % = (co n ce n tra tio n d o wn stre a m o f th e filte r/co n ce n tra tio n u p stre a m) x 100, o r
Pe n e tra tio n % = (n o . p a rticle s co u n te d d o wn stre a m/ n o . o f p a rticle s co u n te d u p stre a m) x 100
F iltra tio n e fficie n cy % = 1 p e n e tra tio n %
4.4.4 Res is tance to rough handling. F ifte e n (15) first a rticle filte rs, wh ich h a ve p re vio u sly
p a sse d a irflo w re sista n ce (4.4.2) a n d filtra tio n e fficie n cy (4.4.3) te sts, sh a ll be su bje cte d to
ro u gh h a n d lin g in a cco rd a n ce with me th o d T 105.10 o f MIL ---ST D ---282. T h e n 5 e a ch o f th e 15
filte rs sh a ll be te ste d fo r re sista n ce to a irflo w (4.4.2), filtra tio n e fficie n cy (4.4.3) a n d a ir le a ka ge
(4.4.5).
4.4.5 Air leakage. T h e sa mp le filte rs sh a ll be te ste d fo r le a ka ge u sin g a te st a p p a ra tu s wh ich
sh a ll h a ve two fla t (with in 0.005 in ch ) smo o th (32 micro in ch ) su rfa ce d me ta l p la te s a t le a st 0.25
in ch th ick th a t ca n be cla mp e d to th e ga ske ts o n th e in le t a n d o u tle t o f th e filte r. T h e cla mp in g
me ch a n ism sh a ll be co n tro lle d so th a t th e to ta l co mbin e d co mp re ssio n o f th e two ga ske ts d o e s
n o t e xce e d 0.120 in ch . T h e re sh a ll be p ro visio n s in o n e o f th e p la te s wh ich sh a ll be fixe d to th e
ba se o f th e a p p a ra tu s fo r p re ssu rize d a ir to be in tro d u ce d in to th e filte r u n d e r te st th ro u gh a
flo w me te r ca p a ble o f me a su rin g a flo w o f 0.91± 0.06 cu bic in ch e s p e r min u te o f a ir flo w. T h e re
sh a ll a lso be p ro visio n s fo r me a su rin g th e p re ssu re in sid e th e filte r be twe e n th e se p la te s
th ro u gh th e u se o f a ma n o me te r o r p re ssu re ga ge ca p a ble o f me a su rin g p re ssu re s o f 12.00 in -
ch e s o f wa te r with a n a ccu ra cy o f ± 0.06 in ch e s o f wa te r. T h e in te rn a l p re ssu re me a su re me n t
sh a ll be ta ke n th ro u gh a se p a ra te p a ssa ge th ro u gh o n e o f th e two p la te s fro m th e p a ssa ge th a t
is u se d to in tro d u ce th e me a su re d flo w o f a ir. T h e a p p a ra tu s sh a ll a lso h a ve a flo w re gu la tio n
va lve by wh ich th e a ir flo w ca n be co n tro lle d . T h e te st sh a ll be co n d u cte d by cla mp in g th e filte r
to be te ste d be twe e n th e two me ta l p la te s, o p e n in g th e a ir flo w co n tro l va lve , a n d a d ju stin g th e
flo w u n til a p re ssu re o f a t le a st 12 in ch e s o f wa te r is e sta blish e d with in th e filte r. T h e flo w ra te
th a t is re q u ire d to ma in ta in th is p re ssu re is th e a ir le a ka ge va lu e .
4.4.6 Workmans hip. Ve rify by e xa min a tio n .
5. PACKAGING
5.1 Packaging. Fo r a cq u isitio n p u rp o se s, th e p a cka gin g re q u ire me n ts sh a ll be a s sp e cifie d
in th e co n tra ct o r o rd e r (se e 6.2). W h e n a ctu a l p a cka gin g o f ma te rie l is to be p e rfo rme d by D o D
p e rso n n e l, th e se p e rso n n e l n e e d to co n ta ct th e re sp o n sible p a cka gin g a ctivity to a sce rta in re q -
u isite p a cka gin g re q u ire me n ts. Pa cka gin g re q u ire me n ts a re ma in ta in e d by th e In ve n to ry Co n -
tro l Po in t's p a cka gin g a ctivity with in th e Milita ry D e p a rtme n t o r D e fe n se Age n cy, o r with in th e
Milita ry D e p a rtme n t's Syste m Co mma n d . Pa cka gin g d a ta re trie va l is a va ila ble fro m th e ma n -
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