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MILA-9067C

the proposed specific end item utilizing adhesivebonded components, or both (jf deemed neces-sary ), shall be made available for review byengineers of the procuring activity at least twoweeks prior to commencement of production. Thecontractor shall certify that compliance with suchprocess specification will produce a materialmeeting all the contract requirements. The spe-cific requirements, processeg, inspection methods,and precautions specified hereinafter shall beincluded and completely described in the processspecification.

3.1.1 IUattiLs. All materials used in the pro-cess shall conform to ‘ applicable Governmentspecifications or other specifications as stipulatedor approved by the procuring activity.

3.1.1.1 Adhesive ta be used in productionbonding of parts shall be sampled and tested pre-ceding its use within a period’ not exceeding one-third of the adhesive shelf life specified by itsmanufacturer, but not more than 1 week (168hours) to determine its conformance to thenormal (room) temperature and short-time ele-vated temperature shear strength requirementsof the specification governing its use. When ap-proved by the prime contractor or procuringactivity, the short-time elevated temperaturetest may be omitted. When required, the ele-vated temperature test shall be at the maximumuse temperature to which the bonded assemblywill be exposed. The faying surfaces of the testspecimens shall lJe treated by the same methodand materials as are used on production parts.

3.1.2 Bonding procedure. All operations con-nected with bonding, from the drying and storageof surface-treated parts to be bonded throughtheir assembly for final bonding, shall be con-ducted in an area that is dust free to the extentthat bonding operations are not affected. Theprocess specification shall define the actualranges of temperature and humidity encounteredin production. (However, the contractor is urgedto maintain the temperature of the bonding s,reawithin the range of 65° to 75s F. (18° to 24° C.) ;and a relative humidity at 40 to 65 percent, )Bonding under the contractor’s specified temper-ature and humidity conditions sila!l be lirr~;ced tothe use of SUCII adhesives as will assure ,l,ill~sjrn

thereunder as proven by previous performancerecords of the contractor,

o3.1.2.1 Refitting oj parts. The surfaces shall

have good contact over the entire area b bebonded and shall be free of burrs, waves, andother surrace imperfections, or as defined in theprocess specification. When practicable, thesurfaces shall be prefitted. Surfaces not prefittedshall conform to the applicable drawings.

3.1.2.2 Preparation oj /aying surfaces. Theprocess specification shall specify procedure fortreatment of faying surfaces of parts to bebonded, and precautions to be taken to elixninatecontamination of treated surfaces awaiting appli-cation of adhesive. The time that treated partsmay’ remain uncoated shall alSObe specified, andsubstantiated by tests described in the contrac-tor’s engineeriiig report (see 3.1).

3.1.2.2.1 Suggested procedures jor treatment.Treatment of metal faying surfaces ta be bondedmay be accomplished M specified in 6.1.

3.1.2.2.2 Solutions. All surface - treatmentsolutions shall be teeted and maintained at properconcentration as specified ‘in the process specifi-cation.

3.1.2.2.3 Handling oj treated parts. Cleaned,treated, or cleaned and treated parts shall not beIlandled with the bare hands nor shall any con-tamination result irom contact with supportingfixtures or mechanical handling equipment. Whiticotton gloves should be used.

3.L2.3 .4ppliccztion of adhesive. The exactprocedures to be followed, and equipment to beused, in the applicationof the adhesive tO thespecific material to be bonded shall be describedin the process specification. (If the general pro-cedure recommended by the adhesive manu-facturer is not followed, the contractor’s engi-neering report {see 3.1 j shall include data prov-ing the procedure is n{kquate for the use in-tende !. After app]icat it?n of the adhesive, thecoated p~i’t~ -hal] be kept dry and free from dirt,grease, oil, wax, or other foreign material andshall not be il~udleli u:ith the bare hands. Thelengti~of time ~,][]esi~e cofited parts are allowedto-tandl)(for~!,)r:d:n,” chnll not exceed the open

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MII.FA-9067C

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~Mmbly life of the adhesive and shall be speci-fied in the proceaa specification. Precautions tobe taken to eliiinate physical contamination ofthe adhesive coatings shall also be specifiedtherein.

3.1.2.4 AwJemMvoj ports. Gre shall be ttdsenin aeaembling parts in the curing fixture or jigto aaaure that the adhesive isnot disturbed &ndthat exceaaive residual atre~s are avoided.Static ekctricity w“ generated through curingfixturee and bonded asaembliee @hall be con-trolki by groudng or by other means withinapphcable. safety codes. The proceaa Wecificationshall deacnbe procedures to be wed in the aa-sernbly of par& [If the azwembly instructions ofthe adhesive mmmiacturer are not fuMiUed, thecontractor’s engineering report (we 3.1 ) 8MIinclude mhatantiation for the deviation there-from.)’

3,1.2.S Curing of adhetive. The process speci-fication thdl contain detailed curing proceduresapplicable to the adhesive bonded parta andprocess equipment to be wed. (If the generalprocedure of the applicable adheaive manufac-turer i~ not followed, the contractor’o engineeringreport Iaee 3.1) shall include data provkg theprocedure is adequate for the use intended.) ‘flQw-ever, beat curing cycles shall be cho8en aQ that,aa a resuk of proceaaimg through the maximumnumber of cycka that may occur during fabri-cation, there will be no reduction of mechanicalor corrosion-reatit properties of the m@xialsL&g bonded ti valuea Mow the minimum of.theapplicable material specification.

3.L2.6 l“empewtwre aid prawwm r8qwire-mats and controk. Temperature and premurerequirements and the detaiia of pmcedurea to befol~omwdfor their measurem ent and control duri-ng product.km bonding of parts shall he includedin the prweaa specification.

3J27 Bondiao of mbaaernbiia. If bondedmhsaem.bka are ta be bonded again iota findamembk, a description of precautions to betaken to assure that subsequent surface prepa-ration and bondii operation cause no ill effectson the initially bonded parta shall be included intheprwxsa apecifkktion.

3.1.3 Protection of bonded joints. Completedetails of the materials and procedures to be usedin the protection of bonded joints &all be in-

cluded in the process specification when protec-tion by coatings or other ❑ eana is neceseary be-cauae 01 the particular application or materialsused in bonding. Bonded joints, such aa A theexposed edges of sandwich componentir accem

doors, and windows shall be protected ag~inat theentrance of liquids (water, fuel, oil, eti. ) into thecore of the sandwich. The manufacturer’s testior proving the adequacy of the panel sealingagainst khe entrance of moiaturo into the amwn-blkw must be approved by tbe prime contractoror procuring activity upon demand prior to pro-duction.

$.1.4 Other techniques or precautiana requiredfor proper storage, such aa control of film tbiok-neas, control of application, corktrol of kniditydwing fayi,ng surface pmparatiom, acbeahe ap-pkation, and tooling which may be appli=bleto the particular adhesive or to the conditioma offabrication being employed, shall be imhwled hthe process apeciticadion.

3.1.5 The prowea apeci$cation hall complywith section 4 herein and ahll contain spacMcpwvisiona for mmplkg, lot sk+ emamimti,and testing tQ asatme conforummce to the require-mtmti.

3.1.6 Rework or repmk, Protixon for reworkor repair of defective parta shall be stated in thepnomsa qweification and shall he subject to a&prova~ on demmd by the prime cmtractm orprocuring activity.

$2 Wowknmamdp.The adhesive ahdl be ofan organic or mxnkrganic main type NW.factu,red to conform h Wa specification. It shallbe free of suspended foreign matbr which mayappear later upon application and shall IM freeof substance w~ich might cawe cmroaion tometala.

A QUAUTY AS9UUNCE PROVISIONS

Al lmspection mqwmdMity. The supplieria responaibie for the performarxe of all inapee-t ion requhemen~ aa specified herein. Except aa

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MIL-A-9067C

otherwise specifiecl, the supplier may utilize hisown or any other inspection facilities and servicesacceptable to the Government. Inspection rec-ords of the examination and tests shall be keptcomplete and a~ailable to the Government asspecified in the contract or order. The Govern-ment reserves the right to perform any of theinspections set forth in the specification wheresuch inspections are deemed necessary to assuresupplies and services confom~ to prescribed re-quirements.

42 ClasaifieatiOu of teats. All of the teats ofthis specification are classified m acceptancetests, for which the necessary sampling tech-niques, examination procedures, and methods oftesting are specified in this section. Tests shallbe performed during the fabrication of adhesivebonded parts which are to be submitted for ac-ceptance under a contract or order.

43 Acceptance tests.The primary and con-tinuing purpose of the acceptance teats shall beto see that all the requirement and proceduresof the process specification specified in 3.1 arecontinuously complied with during production ofparts. This shall be accomplished by periodicinspection of the production processes, controls,and other items covered by the process specifi-cation.

4.4 Samp@ and i3M~OIL

44.1 iVonde8truc!ive te.rts. Nondestructive in-spection shall be made of the adhesive bond ofeach production part. Inspection shall includevisual inspection of bond quality, tapping, cut-ting buttons or plugs from the joints, ultrasonicor other methods as described in the processspecification approved by the prime contractor orprocuring activity on demand. Details for visualinspection and ititrumentation used, ita oper-ation, calibration, and correlation with destruc-tive test methods shall be included in the processspecification,

4.4,2 Destructive quantitatit!e strer@h test8.

4.4.2.1 Preparation oj eztensioti, coup(.ms, orstandard spea”men8. Production bonded parts,that cannot be examined by nondestr~lctive

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1111’[1)0[/s,$Il:il]incorporate. wilere possib]e.e~-tension.:or coupons that may be cut from the oparts after bonding and will be representative ofthe bonds obtained in the parts proper. Whereextensions cannot be incorporated in the parti,standard specimens shall be fabricated. Theseshall be bcnded at the same time, with the samefidhesive, and in the same equipment and underthe same conditions as for the assembly theyrepresent. The procedures for their incorporationor fabrication shall be included in the processspecification.

4A2.2 Sampling. The number of extensions,coupons, or specimens prepared in accordancewith 4.42.1 to be selected shall be specified bythe contractor in the process specification.

4.4.2.3 !?e8t method. Destructive quantitativestren@h te~~ shall bc lnade of the adhesivebonds in the extensions, coupons, or specimensprepared in accordance with 4.4.2.1. The testprocedures to he used, and the requirements to bemet shall be specified in the process specification.

4.493 Destructive inevection.

4A3.1 Sampling. The first bonded part and asufficient number of succeeding parts (h bespecified by the contractor in the process speci-fication ) shall be selected from the productionrun and tested in accordance wi&h 4.4.3.2. Sam-pling should be in accordance with StandardM1L-STD-105.

4.4.3.2 ?’e8t method. Destructive inspectionshall be made on parts selected in accordancewith 4.4.3,1 to insure proper fabrication of partathroughout the production run. Any evidence ofimproper cure, adhesion, alignment, water pene-tration (see 3.1.3 j, etc., shall be immediatelycorrected by making indicated adjustments inthe cure cycles m in tooling. When any changesare made in established curing or tooling, or,when new tooling is introduced, even though it isidentic:!l to the established tooling, new testsshall IW macle. T,:sts in accordance with 4.42sIL:LIIbe conducted on representative specimenscut fr(’!’~ the p:{rt, or Stilt iC or iatigue tests onthe entire part. T?L~s?wquenc y of the proposedtests shall he p’r.cklca[e~l o;, tooi life expectancy


and on a realistic learning curve. Checks of tooldimensions and alignment shali be performedafter e~ery assembly is completed, or as pre-scribed in the process specification. Control andtest instruments shall be periodically checkedand caiibra.ted.

4.4.4 The materials and processes covered bythe contractor’s process specification, the articlesfabricated thereby, and the tests made thereonshall be subjected” to the inspection and super-vision of authorimd Government inspectors. Re-ports of tests performed under Governmerit in-spection and supewision shall be fwrniakd theauthorised inspectors.

S. PlllWmTfOFJ FOB DELIVElkY

‘I’here are no applicable requirements.

6 NOTES

ii.1 s~ted procedlwa fow trealsmemlofmetal fayimg Sdmecav

6J.1 Wrought fdurrtirwm and aitcmimm al-&e .[ezcaptmniftih coma). Degreaae surfaceawith an organic solvent, immerse for 10 minutesRt 150° to MO” ‘F. (65.6° to 71.1° c.) ill achromic acid solution of approximately the fol-lowing composition by weight:

30 parta clean, demineralized, oil free water10 pati concentrated sulfuric acid (1.S4

specific gravity (sp gr) )I part sodium dichromak (NaO#V~M

—teelmical grade).

Rime in demineralized wakr at a temperatureno higher than lSOOF. [65.6” C,) and with a pHno geater than 7.5. Observe immediately forwater breaka on the surfaces as evidenced by thewater riot cascading from the parts or specimensin a smooth, continuous sheet. If water breaksoccur, repeat above treatment. Dry the rinsedparts or specimens for 30 minutes, or until thor-oughly dry, at a temperature no greater than150” F. (65.6” C.), and repeat the water-break~est or subject to inst rurnent at ion test as specifiedin 6.1.5.

MIbA-!H)67c

6.1.2 Stainiess steel (ezcept curufwich cores).Degrcase and proceed as specified in 6.1.1, exceptthat immesion will be for 15 minutes at 150°to 160” F. (65.6° to 71.1° C.) in a strong acid-dichromate solution of the iollowing composi-tion:

96.6 percent by volume concentrated sul-iuric acid (1.$4 sp gr)

3.4 percent by volume aat.urd.ed wstasolution of NeCrA2HAJ

613 Sandwich cow (aluminum dlovs). De-grea.M and proceed as spscified in 6.1.1 exceptthat immersion will be for 15 minutes at lSOOto160° F’. (65.6° @ 71.1° C.) in s mild acid-dctergent solution of the fobving campoaitionby weight:

92.9 percent clean, demineralised, oil freewater

1.0 percent concentrated sulfuric acid (1.84*w)

6.0 percent @odium dicbromate G%&-&.2Hst&technical grade)

0.1 percent surface active detergentIPhmonic F-6$ manufactured byWyandotte Chemical Corp., Wyan-dotte, Mich.).

6J.4 i30d* cow [ti~urn ad 302 t~%Stain&s* &tee[). Degrease and proceed as qwei-fied in 6.1.1, except that imrnemion will be forIS minutes at 150° to 160° F. (65.6” to 71.1” C.)in a detergent solution of the following cormpasi-tion by weight:

94.4 percent clean, rieminerrdiied, oil freewater

2.0 percent sodium metaaiJicate (NaS102)3.6 percent surface active detergent. (’l%

ton WOO manufactured by Rahmand EIaas Co., Washington Square,Philadelphia, Pa.)

6.1.S Water contact angle test, A drop of dk-tilled or demineralised water plamd on a flat,dry, thoroughly prepared metal surface willspread rapidly and uniformly over the surface.

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MILA-MKi7C

If the water drop does not so disperse itself, themetal surfac+is not properly prepared for sub-sequent adhesive bonding and must be repro-cessed. lVith <proper instrumentation, the angleof contact of ~ drop of water with a base surfacecan bc measured. A low contact angle (10 de-grees or less) indicates a surface satisfactorilyprepared for ‘adht sive bonding. A satisfactorycontact angle measu?ing apparatus consists prin-cipally of a telemicroscope with a crosshair in arotating eyepitie and with a prism on the objec-tive end. The process specification will includean effective quality control provision based oncontact angle measurement and instrumentationdescribed herein.

6.L6 Treatnbent of titanium prior to adhesivebondi~~g. The following treatment is suggested:

(a) Methyl-ethyl-ketone wipe.(b) Trichloroethylene vapor degrease.(c) Plclile in the following water solution

at rcmm temperature for 30 seconds:Nitric acid—15 percent by volume of

70 percent nitric acid solution.

HydroOuoric acid-3 percent byvolume of 50 percent hydrofluoricacid solution.

(d) Rinse in tnp water at room temperaturefor 2 minutes.

{c) Immerse in the following water solutionat room temperature for 2 minuke:Trisodium phosphate — 6.68 ouncesper gallon of solution.

Potassium fluorid+2.7 ounces pergallon of solution.

orSodium fluorid+12 ounces per gal-lon of solution.

Hydrofluoric acid (5o percent aoh.l-tion) 2.6 percent by volume ofmhltion.

(f) Rinse in tap water at room temperature.(g) Soak & 150” F. tap water for 15

minutes.(h) Spray with distilled water and air-dry.

Notu. If heavy heat-treat maledeeds pti to ●bove pnxmiure.

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pment,molten salt

6.1.7 Treatment + magnesiunt alloy, A2-31-1124 prior to adhesiue bonding. The following otreatment is suggested:

(a) Degrease panels for 10 minutes at roomtemperature in trichloroethylene,then treat for 10 minutes at 160° to190° F. in the following solution:95.3 percent by weight water2.2 percent by weight NaaiOs(metal)I. I ~rcent by weight Na*P&(pyrophoaphate)1.1 percent by weight NaOH0.3 percent by weight NacconolNR 1,

(b) Rinse panels with cold distilled HA andthen treat for 10 minu~ at 155° =5”F. in a solution of 20 pement C*.

(c) Panels are then given a final rinse inwarm distilled H20 and air+ied.

(d) Prepared surfaces +ould be primed withadhesive or bonded as soon as poa-aible; elapsed time not to exceed 8hours.

Note. Proprietary corrosion preventive treatraeats,mlcll M Dow 7 and Dow 17,produce eatisfllctmyMlrfau?sfor edkive bonding provided a sinc~b ~ting ois not applied before howling.U Dtmtioluh6.2.1 Prime contractor. A prime contractor is

a contractor fabricating items under direct con-tract with the Government, or subcontractingthe fabrication of such items; or a fabricatorsupplying items directly to the t%vemment.(Whenever the term contractor appeara in thisspecification, it will be construed to be the primecontractor. )

62.2 Subcontractor. A subcontratir is afabricator supplying items or components to aprime contractor.

6.2.3 Process specification. Whenever theterm process specification appears in this speci-fication, it will be construed @ be the contractorprocess (see 6.2.1 ) specification prepared in ac-cordance with this specification..—1(Nacconol NR manufactured by Nation.el Aniline

Divieion, Allied Chemieal and Dye C!aporetion, 40Rector Street. Ne= l’Jrk 9, N. Y.)


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0kdta. When Chemxnent d.mwings,apeeiiicationa,dmwmgs, “apacificnt ioas,

or other dam am umi [or My purpoes other than in rr~rded by kODli~t iOn

MJLA-906?C

or other da in not t o beor ot ie+se M ‘m any r tmmer

Canectb uitb ● ddniteiy related Government pro- - - “licensing the holder or arty other penon or cwporstim,curwaem os-, the Urtitad StB* Governmentt!leldw incum00 resnonm‘bilitynor iMY obl.i~tion wbat- or ~mveyiug Wy *W or permbsiorj to rnamlfactm

soeww; d tk kct that the Goven tment my bsve we, or *11 nay patented bwotiori that may in aoy -yformthted, tiidt~, O? ill -y WSy COp$@d the aid be relsted thereto.

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ONSWWCTIONS: b A oonthmina dfod to tie ow a**titiou d--mm bettim, b tin mnidm t.ixisform for use in

CQbdttiM COmmmm and CWU~iOM for ~mT-=~*. Ml usets of mihmf madu$izatioa $ocument4 am inrited to mmidemggdom. This form may be dekcbd, folded along th limes indiated, W@ dow the boa edge (DO NOT STAFLE), admailed. ImW& 6, be * spdrxc u pomsikh about particular problem mem such M wording whkb required int4mpreWtion, m

too rigid, rutrietimi, Mae, a?mb@OW,@ ma incompatible, ad give lmopoeed wordii cbwa wbkb WOUMdievia te the

problem. t i~ in block $ U3T ~k8 not rekti to a 81XCi.fk psragmph Of th docume nt. M block 7 k ftied out, andmode&mmmt w ill b - to YOU w ithin 30 C@Wto M YOU kJWW tbt your COXOJXZ@ntiwere mceiwd and am &iiCQnaemd.

NOTE: TM form may moc be used to request copim of documenm, aor to request d=?% devhtioq or ckifkation of8Pocifiatim reqammti on CilnentCommmm. CommenW submitted on thb form do not conatitum a imply authorbationto waive my XOO of tht ref-mced document or to amend amtmctwl mquimmmta.

(FoEd a&n@ thb UIU)

(Fold don, WJ lineb

DEPARTMENT OF THE NAVY

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111111 FI

UNITED HATES

OFFICIAL 6U$iNESPENALTY FOR PRWATC USE ~ BUSINESS REPLYMAIL

FIRST CLASS PGRMIT NO. 12S03 wASHINGTON 0. C.

FO~AGE WILL BE PAID BY THE DEPARTMENT OF THE tUAVY

CommanderNaval A$r Systems CommandIdashington, DC 20361

(AIR 51122)


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STANDARDIZATION DOCUMENT IMPROVEMENT PROPOSAL(See Instructions - Re~erseSide)

DOCUMENT NUMSER 2. DOCUMENT TITLE

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I . NAME OF SUEMf TTING ORGANIZATION

PROBLEM AREAS

a Paragraph Numbarm_rd Wording:

b,

c .

Racommendad We-ding:

Reason/R8tion810 for Recommendation:

TYPE OF ORGANIZATION (Ma rk WC)

“cl VENDOR s

❑ uSE R

c1 MANUFACTURER

c1 OTHER (SbrecifY):

. REMARKS

a. NAME OF SUBMITTER (La e t , Fire f, Ml) - Optional

. MAILING ADORESS (Street , City, State , ZIP Cod e ) - Optional

DD FORMS2 MAR 1426 PR’EVIOUS EDITION IS OBSOLETE.

b. WORK TELEPHONE NUMBER (Include Amocoda ) - Otxional

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