MI I.-C-9O84C9 June 1970

SUPERSEDING

I

1. SCOPE

MIL-C-9084B22 January 1660(See 6.5)

MfLfTARY SPECIFICATfON

CLOTH, GLAs2, FfNSHED, FOR RESIN fAMINATES

This spec Ulcation 19 mandatery for use by all Depart-menta and Agetxle O of the Department of Defense.

~. This specification covere woven glass cloth that has1.1been suitably flnlshed for further fabrication into glass fabric-base resin laminatesand sandwich materials.

1.2 Claaslfication. The cloth SW be of the types shown in Table Iand of the following clasaea:

I , r’Class 1- For polyester famlnatesClaaa 2- For qx+xy Iaminatca

‘-l Cla88 3- For atllcene Lmninates\ Claae 4- For phemllc laminatea

2. Applicable DOCUMENTS

2.1 The following dncumenta nf the issue in effect 00 date of fnvitat[onfor bids or request for pmpocal, form a part of thie specification to the extent specI-fled herein:

6pECIFICAT10NS

Federal

PPP-P-1133

.Mllttary

3U-Y-1140

MIL-R-7575

Packaging and Packiog of synthetic Fiber Fabrfce

Yarn, Cod 6kvtog, Cloth, and Tape - Glaas

Resin, Polyester, Low-preseure Laminating

“m

.,. .

,.

MrL-c-9084c

SPZCI’FICATIONS

K!MNY (continued)

MfL-R-S!299 Resin, Phenolic, Laminating

MIL-R-9300 Res in, EporJ, Low-pressure Laminating

MIL-R-2S506 Resin, SUicoae, Low-pressure mIMI~

S1’ANDARDS

Fedeml

FED-STD-191 Textile Test Methods

FED-~D-406 Plastic, Methoda of Teatlng

Y!&?l’

MIL-SI’D-105 fipling Procedures and Tables for Imapection byAttributes

(Copies of sp~ifications, standards, drawfngs, and publlcatloaa required bysuppliers In connection with epeciflc procurement functions abuuld be obtairied frumthe procuring activity or as directed by the co@ractl@g,offic er. )

3. REQUIREMENTS

3.1 Materlai. The cloth shall he manufactured from continuous fila-ment giaae yarna in accordance with Table I.

3.2 Construction and Physical pI-uLetiies. The conatructba andphysical properties of the finished cloth shall conform to the requirements listed inTable I when tested as specified in 4.2.3.

3.2.1 Width. Unless othenviae specified (6. 2), the width of Ure fin-ished cloth shall be 3S Inches, induaive of the sekges, and the width mlemesbail be -O. 2S Inch to +0.50 iach.

3.3 Finish. The finish ahail be such as to produce the. cbzmacteristics~equi red of finished g=loth in this spec Uicat ion, including the required per-formance chamcteristics when the finiabed cloth is made into a laminate with alaminating reein appropriate far the respective claw+ (1.2) of the finiehed cloth; thatis, with polyester resin for Class 1 cioth, epoxy resin for C1aes 2 cfoth, siliconeresin for Claes 3 cloth, and phenolic resin for Class 4 cloth. The Kinisb may tom.prise ouly a suitable cleaning operation to remove the processing oils ard bindem

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present In the greige clotlb provided such a flnleh furniebes adsquate compatibility.- wlth tbs applicable resin: or It may comprise a cleaning opemtlon with subsequent

application of add[tlonal materials (e.g. , resfn-coupliczg ageots, htb ric condltfonem)to the cleaned cloth. The f!nlsh used shall be identified (3.7) by the finished clothstpplier’g desigcstioa. S,~pplementing of the suppllerrs designstinn by a cb’emfca.lcbarsc@rlzatioa on the same label (e.g. , “a chromium complsx finish’!, van aminosilane finish”) is recommended but is mt required.

3.4 ~. The cnlor 01 the finished cloth sbsll be uniform and shallha cbamcteristic of the applled finish. When specified in the contmct or order (6. 2),the ws rp df rection of the finished cloth sbs13 he marked hy colored direction-indicatoryarne running warpwise in ths cloth. Color and spacing nf the indicator yarns, whenspecified. simfl be prescribed in the orderl~ dsts (6.2), but the preferred color is

blue and the preferred spacing is 6 inches between colored yarns.

3.5 Prnpertlee after lamination.$.;.

3.5.1 ,Mcchaaical P rooetiies. laminates based on the finished cloth,when prspared III accordance wtth 4. 2.4.3.1 and tested for mechanical properties

t, In accordance with 4.2.4.5, shall conform tn the requirements of Table H for longi-tudinal tensile pmpertles and of Table 331for longitudinal fiesu~.pmperties of the

~ applicabl e type and ciass of cloth. ,,

1 3.5.2 Electrical pmoertiee. Unless otherwise specified (6. 2), larni- )nates prepared in accordmce with 4. 2.4.3.2 from Classes 1. 2, or 3 finishsd clothand teeted fnr electrical propetilee in accordance with 4..2. 4.5 and 4.2.4.5. 1“~ ‘ “confomr to tbs requirements of Table IV. There shall be on ekctrtcal requirementsfor Iamiaates made from Class 4 finished cloth.

3.6 Lencth of rolls. Unfess otherwise specified (6. 2), the totallengtk of C1OUIin each roll shali be 250 *2S yards for Types I thrnugh IV B, 125 t25yards fnr &Tes V through H A, also ‘&Pas X-U ad XII A, and 6S *15 yards for TypesX through XJ A, slso Type9 XIII asd .XUI A. Unlees otbervfse spscified (6. 2), &emaximum number of pieces in my roll sNI be three and the minfmum length of anypiece shaU be 15 yards.

3.7 IdcntW!catinn of DMduCt. Each mll of cloth shall be marked foridentification in accordance with PPP-P- IK33. Each mfl shall ahsn bear a ticket orIabel sbowiog the identification of tbe finish which has been applied tn the fabric (3. 3).

3.8 ‘WorknansNp.” The finished cloth ahallbe clean and evenlywoven and shall conform m the qu.al[ty nf product established by this specification.Dafccts, if present, ahaU not exceed the UmUa specified hereia.

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TABLE IV

ELECTRICAL REQUIREMENTS OF T.AbUf4ATES ~/

Characteristic

At 1 megacycle/aec(“radlofrequency”)Dielectric constant(max ave)Loss tangent(ma.x ave)

At 8,500 to 10,000megacycleslmx(“ dar f requenc~’)glDielectric consmnt(max ave)bsL7 tangent(ma% awe)

Cliss 1 (polyester)

-t

5tan&ml Immersion

Conditions Conditions

4.4 4.6

0.045 0.055

4.2 4.4

0.020 0.025

CfaB9 2 (epqv)

-1--Standanf Immersion

:onditlons Conditions

+

4.4 4.6

0.045 0.055

4.6 4.6

0.020 0.025

Class 3 (silicone)

San& d hnme rslon;onditiona Conditions

4.2 4.2

0.030 0.030

4.5 4.5

0.025 0.025

~/ Ther~ are no electrical requirements for Ciasa 4 flniabed gfass cloth.

~/ “X:band’ frequency range. The recommended teat frequency for this band ie 9,375megacycles per second.

4. QUALfTY CONFORMANCE PROVIS1ONS

4.1 Re.monalbility for Insrxction. Unless otherwise specified in thecontractor purchase order, the supplier is responsible for the performance of allinspection requirements ae specified herein. Except as otherwise specified in thecontract or order, the auppiier may use hia own nr any other facilltlee suitable forthe performance of the inspection requireme”tia epecified herein, unless disapprovedby tbe Government. Tbe Government reserves tbe right to perform any of the lnsuec-tions set forth in the specification where such Inspections are deemed necessary to

assure that supplies and services conform @ prescribed requirements.

~.g @sIitv conformance inspection. All Inspcctioo of tbe productunder this specification shail be classified as quality conformance inspection. Qua!itvconformance Inspection shall include the following:

I.-

-i

7

“I

-;

i

I

I

;I

L

MIL.C-9084C

(a)

(b)

(c)

Examirx+tlon of @ls (4.2. 2).

Teste of flnlsbad glass cloth (4.2. 3).

Teata of resin laminata (4.2. 4).

. .

. .

4.2.1 Sampling for aualkv conformame Insrmctlon. sampling forqualfty conformance ln6pection ehdl be In accordance with MfL-STD-105 and 36qwclfled herein.

4.2. 1.1 ~. For aampllng purpoeee, a lot ehall consiEt of afl the fin-ished glaes cloth of one type and clase subjected to kiapection at one time.

4.2. 1.2 Unit of product. T1.e unit of product for determining lot size andalao the unit of product for e.ampllng shall be an specified la the indfvidwd examina-tion or teat.

4.2.2’ Examination of rolls. The examination of rolls shall coneist ofover-all examination (4. 2,2. 1), lecgth examlndon (4.2.2. 2), and yard-by-yardexamimttion (4.2. 2. 3).

4.2.2.1 Over-afl examination. The tlalt of product for datermlning lotsize for this examination shall be one linear yard and the eample unit shall be one roll.The number of sample units (rolls) eelacted for -mlnation almll be as shown InTable V. The eample rolls shall be examined for the d+ets listed in T+le Vf andeach defect aball be counted once 10 each roll In which It is obsemed. The maxfrnumacceptable number of &fects (acceptance mmiber) shall be as ehown in Table V.

TABLE V

SAMPLS SUE AND ACCEPTANCE NUMBER FOROVER-ALL AND LENGTH EXAMIXATIONS

Lot Size Sample Size Acceptable Number of

(Yards) (Bolls) Defects in kples (Max)

Upta L300y 3“ o1.301 to 3,200 5 03,201 to 8,000 7 08,001 to 22,000 10 “.0

22,001 to 110,000 15 1110,001 and over 25 1 . . .

J/ If the lot contains fewer than 3 rolls, each mll of the lot sbail be examined.

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TABLE VI

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IOVER-ALL DEFEcTS m ROLLS

Over-ail uncleanlinessObjectionable odnr (otiorof cbemicalscommc.sfy used infinishing compotmdssbail nntbe regarded as objectionable)Color not characteristic of the applled’finish

Cloth brittle or fused tbrougbout

Uneven weaving tbrougbout clearly visible

4. 2.2.2 Le rgthexamisation. Intbisexamisation, tbe unit ofpmduct for.determining lot size. eballbe onelinear yard andtbesample tit abafl be one rnll.The number of rolls selected for examination aballbeassnown in Table V. Everypiece in each cd the sample rolls shafl be examined for gross length. Any piece foundto be shorter than is marked on the piece ticket, or any roll found to contain morethan the.permitted maximum number of piecee (3 maximum, unieas otherwise s+eci-fied in the ordering data), or any pisce less than the permitted minimum Iesgtb (15yards minimum, unfe88 otberwiae specified in the ordering data) shall be considereda defect with regami to le&th. The maximum number of length defects half be asabown In Table’V, but, in addition, the lnt shall be unacceptable if the total of theactual gross lengths of pieces in the sample rolls ia less than tbe total of the grosslengths marked on the pisce tickets.

4.2. ?.3 Yard-by-nrd examination. The unit of product for determininglnt size for this e%amisation ahafl be one linear yard asd the sample unit shall alsobe one linear yard. The defects listed in Table Vfl shall be counted regardless oftheir proximity to each other, except where two or more dsfects represent a singlelocaf condition of the fabric, in which case only the more serious defect shall becounted. A continuous defect sbalf be counted ae one defect for each wa rpwi se yard orfraction the reef in wbicb it occurs. The inspection level sbalf be Level fl ofMXL-STD-105 and the Acceptable QUSlity Level (AQL) shall be 2.5 major defects and10.0 to~l dsfccts per 100 units (yards). The number of rolls frnm which the sampleis eelected sbalf be in accordance with Table V and an approximately equal number ofsample units (yards) shall be e-ined from each roll selected.

4.2.3 Teats of finished glass C1OUI. For this test, the sample unit asdthe unit of product for determining lot size abalf be one finear yard, full width oftbe cloth. The sample size shall be 10 accordance wiih Table VfIf and each sampleunit sbail be subjected to afl the tests of Table fX. Tbe lot shall be unacceptableif one or more units fail to meet any of the specified teats.

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TABLE VU

CLASSIFICATION OF DEFECTS. IN YARD-BY-YARD EXAMINATION

Defect

Bias or bowedfilling

Bnggy, ridgy,or wavy cloth

Hole, cut, ortear

spots, Ctreckc,

3r stains

render or weak3pat

Smash

3roken or mlss-ag end9 or>Icks

?]OatS andikips

:aarse ori.gbt [Illlng

Descrlpt ion

Distorted fmm horizoti by ~Ore than 3 i*cheS

for 36-iach width and proportionately for otherwidths

Clearly visible ~1

3 or more yams ruptured at adjoining points

Clearly visible 2 Inches or more in combineddirections Al

Hearly v[sible less tha~ 2 inches but greater

:k”n ti4 Inch la combined dI rWtiO~ ~/

:learfy visible 2 Inches or more III combined

ii rectlons ~/

:learly visible less tbah 2 faches but greaterhan 1/4 tach in comb [tied directions #

i ny

I or more coatigaou~ r~aae~a of ]e@b or 2:ont!guaus more than 36 Inches la length

! contiguous less tbaa 36 inches la length

! inches or more In combined warp oad ffllKrectlons

.ess than z lacbes la combined warp and fillIlrections

her 1/2 Inch la wtdtb

Majol—

x

x

x

x

x

x

x

x

x

x

x

x

x

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TABLE VD (Contfnued)

Defect

Selvage defects

Crease

Uneven finis h

Brittle or fusedarea

Width

Deacriptfon

Curled nr folded under

Hard embedded and folded over on self

Thin areaa where finlating compound is miss-ing or insufficient, clearly vtaible ~/

Any

Exceeding epeclficd tnle rance (3. 2. l)

Major

x

x

x

Minor

x

x

~/ “’Clearly visible” at nn rmal inapaction distance (approximately 3 feet).

TABLE VIU

“SAMPLE SUE FOR TESTS Ok FDilSH&D GLASS CIAITH

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TABLE IX

TEST METHODS FOR FIN3i+HED GLASS CLOTH

Test MethodCharacteristic ‘~~r’+m~nt (FED-9TD-191 methed

Referenoe ma. except ca nnted)

No. of determinationspar sample unit

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TABLE IX (Coniinuet,

RequirementTeat Method

Characteristic (FED-STD-191 method No. of dete rmlnatlonsReference nos. except as noted) per Samole unit

Lea.el/ Table I Visual 1

Yarn ply Table I Vlmal 1

Yarn s!ze ~1 Table I C0mmerci91 1

Including color di rec,tion - indicator yarns where specified (3. 4).

Supplier’s certificate ~f compliance will be acceptable with rsspect to this

requirement.

.4. 2.4 Tests of resin laminate.

4. 2.4.1 Certlfiqation. Un2ess otherwise specified In the ordering data

(6. 2), the test requirements for mechanical properties (3. 5. 1), electrlca! properties(3. 5. 2), or botb mecbanlcal and electrical propetiles of the laminate may he satis-fied by the supplier’s certificate of con.formky to these requirements suppctied bycertified test dati showing that cIoth finished by the same supplier, of identical type,class, and flnisb, hag previously been suhjsded to and has passed the applicabletests for laminate properties under this specification.

4.2. 4.2 Samoli w for Inmlnate tests. Except as pmvlded by waiver ofelectrical requirements (3. 5. 2) or certification of laminate prupe rties (4. 2.4. 1), a!Jample unit 0( sufficient size for fabricating laminates in accoh”ce with 4.2. 4.3for tests In accordance with 4.2.4.4 and 4.2.4. S shalf be taken from each 10,000yards or fraction thereof of finished glass cloth in the Inspection 10C.

~, ~. 4. ~ Preps rat ion of lamlnate sample.

4.2. 4.3.1 Laminate for mechcuicaI tests. The laminate for mechanical(tensile and flexural) tests shall be fabricated in the form nf two or more flat sheetsat least 12 ioches long by 22 inches wide and O. 125 *. 010 lncb th[ck, employing a

pamllel Iaywp of the g119s cloth. The brand of laminating resin employed shall beM the option of the supplier of the finished cloth unless otherwise specified in the

ordering data (6. 2), except tbsc it shall be in accordance with the following:

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Finished cloth Laminating reBln

c13ss 1 Polyester cordormlng to MIL-R-7575

CLSS 2 EPOXYconforming to MIL-R-93oo

Clasa 3 Silicone conforming to MIL-R-25506

Class 4 Phenolic conforming to MfL-R-9299

The la mlnate shall be laid up and fully cured in accordance with the resin manu-factursr’s instruction sheet at a 5aminating pressure not exceeding 30 psi for Classes1, 2, and 3 and 300 psi for Class 4. Tbe sample shall be m prepared aB to be ea8en-tially void free and representative of the beat quality workmanship nnd shall have aresin content by weight that will produce a laminate with optimum properties.

4.2.4.3.2 Laminate for electrical teats. Tbe laminate for electrical teatsat 1 megacycle per second, when requirsrL shall be prepared in accordw=e with4.2.4.3. L The laminate for electrical teats at 8500 to 10,000 megacycles. persecon~ when required, shall be a panel 4 inches tide by 8 inches long by the thick-ness which has been determined as optimum for the test (4. 2.4.5. 1). When the opti-mum tblckness 1s uncertai% the panel almll be made at least 0.75 inch thick. Tbcglass cloth base, rssln content, specific gravity, flnisb, and other pbyslcal cbar-acterfstics nf this sample shall be the same as those of the laminate fabricated Inaccordance with 4. 2.4.3.1 and the fahricatlng procedure shall follow as closely aspnas~ble the pmcedum nf 4.2.4.3.1.

4.2.4.4 Laminate test conditions.

4.2.4.4.1 Standard conditions. Standard conditions shall be 23$1° C(73. 4:1..9° F) and 50 U percent relative humldlty. Spscimens shall be tested afterbeing conditic .-cd for 96 hours .at this temperature and humidity.

; 4.2.4.4.2 Wet condltinn (for mechanical tests). Wet condltlonlng fihalf be a

2-hour immersinn al the spscimen in bolhg distilled water. The apecimenc shallthen be cnnled in water tn 23 *1” C and shall be tested wet at that temperature imme-diately after removal frnm the water. fn case nf any question as to tbe validfty of theteat results, additional specimens shall be anaksd for 30 days in distilled water atroom tempemture and then teated wet immediately after removal f mm the water.Results determined uoder the Mter condition shall be final. ff tbe cure temperatureof the laminate is 100’ C (212” F) or less, the 30-day 6nak at mum temperatureshall be mandatnry for wet conditioning.

4.2.4.4.3 himer610n conditioning (for elsctrfcal tetis~. Tbe speclmem@ be immersed in distilled water at 23 *l” C for 24 hours. The specimen alnll

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‘L:: be removed from the water, the surface m?iature sbalf be wiped off, wad thetests shalf be conducted Immediately at 23 ~1- C.

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4.2.4.5 Lamhmte test methods. Tests of the resin laminates simll bemade fn accordance * T*Ie .X, except that the te~ts of electrical propertie9 are

not Applicable to Class 4 materials (3.5. 2). The Acceptable Quality Level shall bazero dcfecttve sample units. (240 sample unit shall fail to meet the required avemgevxlue for any applicable lamlnate characteristic. )

4. 2.4.5.1 E1ectrfcaI tests at 8500 to W, 000 m~acvcleg per second. Theclectrfd propertie9 teStS of the hamlnates in thk? frequency moge shall be per-formed by the shorted line uaveguide method or resonant cavity technique (6.6), usingthe laminate sample dcacribed in 4.2.4.3.2. A test frequency of 9,375 megacyclesper sccmd is recommended. ff a spectien thimer than the”prepamd laminate of4. 2.4.3.2 IS prsferrcd for the test. it is permissible to abmde or otherwise mi13 thelaminate to the optimum thickness.

4.3 lnSoectIun of prw-mmtion for del[ven. An exambtion ahafi bem~de in accomkmce with the provisions of PPP-P-1333 tu determine complfame wftbthe paciaging, packfng, and ma~ng requ[remeuts U! Section S of this specification.

4.4 fieisction criteria. ff a 53mple of ficdsh.sd gfass cloth fails tomeet the Acceptable Quaffty Level (AQ L) prescribed for my part of the qual [ty coa-

fo rmance inspection of product in this epecfflcatiorq or if the px-cpa mtion-for-delive~ sample mntains more defects than are permitted by the AQL prescr[hedin PPP-P- 1133, the lot of finished C1OUIrepresented by tbe sample shalf be rejected.Dlspsition of rejected lots shall be In accordance $Ath MIL-STD-105.

5. PREPARATION FOR DELIVERY

5.1 Pachgfq. Packaging 9baff be Lsvel A or C as specified (6.2).CIottI of one type and class only shall be put up in rolls and packaged in wxordancewith the applicable requirements of PPP-P- 1133, except tbt the means used on therolls of cloth tu resrrain the rolls from unwinding aball be lfmltcd to types which willnot &mage the glass cloth.

~. ~ Pdclw. Packing sbaff be Level A, B, or C as specfffed (6. 2).Cloth of one type and cfass only shall be packed In accordance with the requirementsof PPP-P-1133 for the applicable level.

5.3 .Matiing. >kirking shall be in accordance with 3.7 and Cbe re-quirements of PPP-P- 1133.

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TABLE X

mwms nr uvctN T.AMTNATFS II.“” .”.,. ----- . . . . . . . . . . . . ~,

Test Method No. of deter-Characterictic Requirement (FED-~D-406 ~ethd minationsper

Reference nos. excspt aa noted) mmpl e unit

Longitudfna3 tensile strength

Standard coudftions (4.2.4.4. 1) Table 13 loll~/ 5Wet condition (4. 2.4. 4.2) Table H 10112/ 5

Lergltudinal fiexurcl strengthStandard conditions (4. 2.4.4. 1) Table m 1031 ~1 5

Wet condition (4. 2.4. 4.2) Table 333 1031 2/ 5

Dielectric cons@.nt” at 1 megacyc]e/secStandard conditions (4. 2.4. 4.1) Table N 4021 3Immersion conditions (4. 2.4. 4.3) Table IV 4021 3

Loss t.c~ent at 1 megacycle/aecStandard condltious (4. 2.4.4.1) Table IV 4021 3

Immersion conditions (4. 2.4. 4.3) Table IV 4021 3

Dielectric constant at 8500 to 10,000megacycles/sec

standard conditions.(4.2.4.4. 1) Table IV (See 4. 2.4.5.1) ‘3

Immersion conditions (4. 2.4. 4.3) Table N (See 4.2.4.5. 1) 3

Lass tangent at 8500 ta 10,000megacycle s,lsec

Standard conditions (4. 2. 4.4.1) Table IV (Sea 4.2.4. S. 1) 3

Immersion conditions (4. 2.4. 4.3) Table lV (See 4.2.4.5. 1). 3

I/ Teats of elsctriczd properties (Dielectric Constant, Ioas tangent) are not applicable to

C@8a 4 material.

~/ TensUe spm?fmenS tn be me U of M~hod 1011.

~/ Flea’ural specimetsa to be 1 by 4 fnchea in she. %=tmens are @ be tes~d ~~~e.

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6. NOTES

6.1 Intended use. The fabrics covered by this specification are in-tended for use in fabricating resin laminates and plastic sandwich materials forstmctu=d parts, radio and radar antenna housings, fairings, and other applications.

6.2. Ordering d..ta. Procurement documests should specify the fol-lowing:

(a)

m)

(c)

(d)

(e)

Title, number, and date of this specification.

Quantity of cloth required.

Type and clam of cloth requirsd (1. 2).

Exceptions, if any, to the optional provisions of this spec Ui-cation, including:

,, )

(1)

(2)

(3)

(4)

(5)

(6)

Required cloth w[dlh and tolerances U other than cpeci-flt?d in 3.2.1.

Requirement for direction-indicator yarns (3. 4) if appli-m.ble, iucludfng color and spacing of the Indfcator yarns.

Applkabl e waivers, U any, of the elect rica! rsqulre- .ment~ of 3.5.2 (Classes 1, 2, and 3 only) (see 6. 3).

>

Applicable mll length sod piece requirements U otherthan speelfied In 3.6.

Laminate tests, U any, for which perfomnance is required and for which certification (4. 2.4. 1) will not beacceptable (see 6. 4).

Requlrsd brand of resin for ~regariw hmimte test

samples U other than the cl~th ~uppll~r, s option (4. 2.4.3. 1).

Levels c.! packaging and packfag required (.5. 1, 5. 2).

6.3 Appllcabilitv of electrical requirements (Classea 1, 2, and 3 oalfl.When finished cloth of this specification IS being procured solely for fabricating non-elcctric~ lamlc&tes or uonekctrlcal sandwich msterhals, watve~ of the el~tricalproperties requirements (3. 5.2) of the spsciflcatlon is not normally c.bjsctionable.Also. U ekctrlcal applications are co involve only “mdlo frequem~’ rnaterfals (test[requemy, 1 megacycle per ssconrf), waiver of the rsqulrements for pmpextles at

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MIL-C-9084C

8500 to 10,000 megacyc.le6 per sesopd is not normally objectionable. However,wtiex? !!!e flniehed cloth may be Issued, ae from stock, for miscellaneous uses which

-Y iml~e “mdfo frequency’ and “ratir frequency” applications, compiete adher-ence to the 3. 5.2 requirements In procurement is indicated. Government agemlessubmitting purchase requisitions or departmental item requirements estimates to acentral procurement facility and desiring waiver of any elect riccf requirements of3, 5.2 shouid so indicate in the requisition or requirements estimate.

6.4 Cetilfication of laminate characteristics. Government sgencleesubmitting purcbaee requisitions or depatimental Item requirements eatimatee ta acenrraf procurement facility and desiring performance of any or aU of the iaminate

tests cd 4. 2.4 in lleu of certification (4.2.4. 1) should specify in the requisition orrequirements estimate which test or tests should be performed and which may besatisfied hy certification. It should he recognised that the laminate teats of tbiespecification are sufficiently costly that quslity control by performame of the testson a procurement lot basis rather than by certlf[cation may resuft In sigdficantlyincreased unit cost, sxtended delive~ time, or even unavailahilltyof material,especiaUy for small procurement lots of the finished cloth.

6.5 Superse.sslon data. Iesues of MfL_C-9084 previoue to tbe pre-sent revision covered oniy finished cloth for use in polyester resin laminates. Thefinished cloth of previouB issues of this specification are, therefore, included inClass 1 of this revision. Classes 2, 3, and 4 of this revision were not included Inprevious issues nf tbe specification.

6.6 source document. Further information on teete of laminate at .8500 to 10,000 megacycles per second Is available in ARTC report “ARTC-4 EIsc -trical Teat Procedures for Radomes and Radnme Materials (Revised July 1960), ”prepared by Aerospace Industries Association of America, Inc. , 1725 DeSales Street,Washington, D. C. 20036.

6.7 bfarElnal indicia. Because of the extensive degree nf revlslonin this issue of the specification, no attempt has been made to indicate by rna%inalIndic ia where changes (addkions, mcd[fications, corrections, deletions) frnm theprevious issue were made. Bidders and contractors are cautioned to evaluate therequire- nts of this document based on the entire content irrespective of relation-ship to tbe last previous issue.

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Custodians:Navy - ASArmy - ELAlr Force - 11

P repn rl ng actlvi~:Navy - AS

(project No. 8305-0423)

Review actlv it les:

Navy - SHArmY - EL, MR, MUAlr Force -82, 45

Defense Supply Agemy - DP

User activities:Navy - .MC, OS

Review/user Inforrrratlon 1s current as of the dats of this document. For futurs coor-dination of changes in tils documeot, d- circrdatlon should be based on the laforrns-tion In the current Federal Supply ClassU1catioa Listing 01 DoD StandafiizationDocuments.

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NOI%: ‘f%b form may mot bc und ~ mquti eopia of docummb, nor fo mqucat niun, dmistioas, or rtuifbtton of

wuithtian r=qulmnt=h on rurmnt eontmets. (2wnntents submitt.d on fhls form do not eondtu~ or inip!y .utbotiuon

tm=+0 UIY POrtiOn of Eha -fem.& d— at(a) or to am..d mntnctual rerwirernrnb.

(F.u.l &u# Ihh 1/-)

1“!{.

(Fold do”# lhb 1-)

DEPARTMENT OF THE NAVY

y PI

UNITED mTATEs

OFFICIAL ●USINES●ENALTY POn ●nlv ATZ u8E EJOO BUSINE:SNoR~P+~M,M~~$

FIRSTCLASS

PO= AGE WILL OEPA.IDOY THE DEPARTMENT OF’TtiE NAVY

Comnrmding OfficerNaval Air Engineering CenterEngineering Specifications b Stnndards

<

Department (ESSD) Code 93Lakehurst, NJ 08733

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STANDNIC4Z4710N oocuMH+Jr IMPROVEMENT PRO~L

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