MIL --- PR F --- 51193E (E A)
3.5.8 Fines retention. Inte rna l fine s me dia sha ll re ta in the a dsorbe nt in the a dsorbe nt
be d, so tha t the a dsorbe nt e mission from a ny individua l filte r sha ll not e xce e d 50 milligra ms
whe n te ste d a s spe cifie d in 4.3.6.8.
3.5.9 Fines media. The fine s me dia ma te ria l, if ma de from na tura l cloth, sha ll re sist da mp -
ne ss a nd milde w whe n te ste d a s spe cifie d in 4.3.6.9. The ma te ria l sha ll ha ve a minimum spra y
ra ting of 50.0 a nd no visible growth of milde w on the ma te ria l sha ll be e vide nt a fte r te sting.
3.6 Marking. The e xte rior filte r body sha ll be ma rke d with the filte r nome ncla ture : "F IL-
TE R , G AS, 283 LITE R S/MINU TE , M18A1", the Na tiona l Stock Numbe r, the lot numbe r a nd
the ma nufa cturing da te in a nomina l 9.5 mm high le tte ring on the circumfe re nce pe rpe ndicula r
to the long a xis of the filte r. The dista nce be twe e n the line s of le tte ring sha ll be a nomina l 6 mm.
The ma rking sha ll be bla ck pa int or ink. A 5 cm long a rrow sha ll be ma rke d on the outside of
the filte r body pa ra lle l with the a xis of the filte r a nd pointing in the dire ction of the a ir outle t
port. A nomina l 9.5 mm high ma rking be low a nd ce nte re d on the a rrow sha ll re a d "AIR
F LO W ". The outle t e nd of the filte r sha ll ha ve the ma rking "O U TLE T " in a nomina l 9.5 mm
high ma rking.
3.7 Workmanship. F ilte rs sha ll be fre e from sha rp e dge s, a ll fore ign ma tte r a nd da ma ge
such a s chippe d or be nt se ctions, cra cks, puncture s, pitting, te a rs, burrs or scra tche s.
4. VERIFICATION
4.1 Classification of inspections. The inspe ction re quire me nts spe cifie d he re in a re cla ssi-
fie d a s follows:
(a ) F irst a rticle inspe ction (se e 4.2)
(b) Conforma nce inspe ction (se e 4.3)
4.2 First article inspection.
4.2.1 Sample. The first a rticle sa mple sha ll consist of 20 conse cutive ly produce d filte rs
which pa ss a irflow re sista nce a nd le a ka ge re quire me nts (3.5.1 a nd 3.5.2). The first a rticle sa m -
ple sha ll be ma nufa cture d using the sa me de sign, me thods, ma te ria ls, e quipme nt, a nd proce sse s
a s will be use d during re gula r production. The first a rticle sa mple sha ll be submitte d for inspe c-
tion a nd a pprova l in a ccorda nce with the te rms of the contra ct.
4.2.2 Inspection Procedure. U nle ss othe rwise spe cifie d by the te rms of the contra ct the sa m -
ple first a rticle ite ms sha ll be subje cte d to a ny or a ll of the e xa mina tions a nd te sts spe cifie d in
this spe cifica tion a nd sha ll be inspe cte d for complia nce with a ll of the re quire me nts of the a ppli-
ca ble pa cka ging re quire me nts. All nonde structive te sts sha ll be pe rforme d be fore de structive
te sts.
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