Document 2jDzeOg8w5pY3JeR3b0rKr27N

.nTiMit- 1- -n .rriiniWiiH."'`Wiifr LIA14172 kr,S iiftn'iiaiu MiTTWigA. r'ii LEAD INDUSTRIES ASSOCIATION, INC N(W YORK. H. y. toot? uu eoea ata Ibbruary 2, lpSj SUBJECT! *VCnaK> WITH IXAD ... AID ATB2SIVES* To the Haahera of the Load Znduatrlea Aaaoelallon, Xnc.s A copy of "Working with teed ...and Adheelvea" la attached. jroana^ t w 2X0 by Anerlcaa Sneltln* and Reflnlnf Carpeny. V* enpbaalte that ttl* booklet do** not pretend to be full coverage of the reaearch. Rather, It le alaed at the aeouatleal caotractar, other building people with a apeclal or coe-tlae lntereat, and Inqulrlea ranging free reeearch and develoisent people to do-lt-yaureelfera. While It baa been checked and approeed for technical accuracy, lta real ala la to provide an eaey-to-foUov aet of lnatructicaa to the warknaa oo the Job and a guide to the deatgner. The booklet haa been printed In United quantity and will not be given broadcaet dletrlbutloo. It vlll be aent to eelected people vboee Intercet or apeelfle Inquiry ehow that they bare a uee for It. We here printed $,000 of theae. Up to 2$ coplea are avail able without charge and aora are available at a coat of Sty each. 81ncerely, Bruce radar ttitniafo^af?t-tgl'rtiMair IrSitAwiatAiriwi WORKING WITH LEAD UA14173 ASA 1 7 *1 -d Thit booklet oaUiaea partly practical ktd ud ocher nbitriMi vkk coouHonfy available adhmm. No daia it made that the adhetivca or tlx mcihodj dctcribcd icpracal tbc be* poetibic practice-- (be whole technology of adhetives iriatim ia ienueal and today' performance limiu may be roulioc tomorrow. Nor a (hr informatioa give* hen Intended to tnppiatt tbc (nMrwd tcchniquei of joining roofing them, for eaampk, or lead burned (welded) )osts which hart become the traditional Btnrtirdt of performance la (heir treat of application. Some of Ok technical data contained herein war derived by rctcarch cooducted by the International Lead Zinc Rctcarch Orgutizatioe A detailed ttudy it available through ILZRO, 292 Madnaa Avenue, New Yort, N.Y. 10017. LEAD MOtBTtlES ASSOCIATION, MC. m MADISON AVENUE, NEW TOU, IT. TM17 _h . IHIUUM .atiUtthNifetfa* N 3463.01 mm a 'mm*n h if p ^p i j . w v j .i m * r"wi mmmmsaBm LI A14174 --Vlitifcgdfljiw WORKING WITH LEAD... MEET LEAD -- a metal with character Foe one ol many maow you are interested is using lead. It may be that you need permanence in eaposurc to aO aorta ol weather, or long service tile is the prrtcnoc of a virulent corrosive like battery acid. Sheet lead handle* there aesignmciws with rate and h la aho a tuperlativt mateital lor soundproofing. X-ray and radiatioa shield ing. aa a spark-free and antt-ataric work surface, and in other special idea. Bat in the aamr way that lend ia unique among aetata in ihrte way*, a haa ita oam peculiarities cd personality nr character. U you want to get the beat (ram lend, youl need to know something about tbeae trait* -- especially aa they apply to the immediate problem of working and Unenipg lead with adhesive*. You already know that load ia relatively soft. Of al common mctala it ia the mot candy beat and formed. even anlimonial or "hard* lead cd thic thickneaa ia readdy formed with tirnptc tool* hke wooden blocks and maUeta. Leads aenaile nrength ia low, too: about 3000 pai com pared wah 70,000 pai for a typical sfeeL But thia low atrengtb ia not aa important in aeasMc draignmg aa the creep behavior of lead. Ita tendency to Welch out, under tension, haute the useful room temperature stresae* to about 250-400 pai far a "permanent" job. At higher temperature*, even lower limna mat be accepted. One curious outcome d thia fact b that nearly aB adheahres which ariB wnt lead'! aurfaoe are acceptably atrong for wcQ-thoughl-out adheaive applications. Thu n *o became the designer alwaya tnca to diatribote the load when working with lead and be inuaDy arrrvet at a practical design which brings the atreaam iaao the range coodortabiy handled by adhesive* d quite modest strength. Ia making a Joint in a free-banging Vk" lead abac*, for eumple, a I* lap will develop only 10 pai in the adhe sive for IS feet at vertical lead. By the tame token, a good design would never call far point attachment or nailing only at the lop cd such a sheet because the high --a-- I r m i LI A 14175 mitu-' htt^mi igii m ifl'itXi.M;<iiigiii il L* and Adhesives -vrta I stresses thut developed exceed lewTi long-term performance and tearing would retuh. Sheet lead It made in two wayv The traditional method, ttill ttandard for moti weights of lead. It by toUing the metal out is a rolling mill. Thete sheets (starting at about Vi>" or1.,**-- 2 pound and 3 pound per square foot, respectively) are covered by a thm film of rollmg oil which mutt be removed to ftt food adhetivc hoods. Solvent degreatinf or, much more utual oo small joba, heavy-duty cleaners like tmodium phcaphate and hot water, remove it quickly. (Where alkali deaocn inch at TSP arc toed they ahoutd not be allowed to Hand on the lead for protracted period! but Suthad away to prevent corroaioa and oxide format*oo ) Thinner lead sheet, typically Vi," or one pound per tquare foot, it usually made by cootinuoua catting and, if to, the metal turface, at supplied, icaddy accept! adhesive. If any lead turface it actually dirty, etc a mild abrasive -- fine sandpaper, scouring powder, etc. -- or acrapc it Be careful though, act to oust or tui tut wrtauc eecpiy or yuuu streafta wna oe mote WHICH ADHESIVE TO USE? An exact count of the number of adhesive types, brands, and package* available today win ditclose that there arc fartoo many to choose between. To the bewildering array already in existence there it a steady stream of nrwesmerv And, if this weren't enough, xQ too often a familiar old product that has proves itself suddenly appears in a package with the faintly disquieting "NEW1 -- IMPROVED!" (ticker on the label TO USX This little booklet recommends only three types of adhesive -- not because they are better than the others, but because they work and among them they can handle nearly every job that comes along. Moreover, they are types which are easily recognized and are stocked by mod hardware and paint atom. CONTACT CEMENTS These are rubber-based or viscoelastic cements to which various nwnlifjlag plastics have been added. Generally they are fairly low In cod, require only ---- wmm Mt* i *p mwm m P*i<w LIA1A176 *i.-t i'i aattiis it aiaiftr<ri 'irntntviuu^irfiafcetiiaAm^MwuwI'w.iu < Ollir "Ilf ftilBUl * a ihort curt period to be strong enough to handle and wort with, and art quite convenient to ute. They are the preferred ccmenti for lamias ting lead for acoustical worit and for any held )ob where larfe turface* (doon, table tope, etc.) have to be covered On the debit tide, their strength it generally lower than that of other tdhetivet. It it adequate, however, where the m*)oc porooo of the turface it cemented. TO USE CONTACT CEMENTS: 1. MAKE SURE THE SURFACES ARE CLEAN AND OILFREE. 2. Apply the adhesive to both turfaoet at directed by tba maaaftctuier't recommeadatioau 3. Allow to air dry until the turface it tack free. (Optional) Lighdy cover with budding paper or Kraft paper at a thp rhtet- 4. Carefully mate with the adhearve coveted turface of Ac lead --cither directly or by carefully removing the dip thnet. 5. Preta or roll to force oat air buhblrt. PRACTICAL TIPS ABOUT USING CONTACT CEMENTS: a Seven! gndet with "drying" tanct bom lett than a minute to about half an hour arc available from many manufacture!*. a In difficult placet or on vertical turfacct, contider tning arvaral amall piecet of lead rather than one large one became... a These ccmenti "grab" and bold tenaciously wherever the fint contact it nude . . . attempt! to icparate the turfacct usually Icadt to irreparable dtmtpr It it often easier to lay out the hmper thee! (lead) on the door or worktable and potitiou the ttifler theet (plywood, gyptum board, etc.) over it than it it to work "right tide up." a Nee much pceuotc required to get a' perfect mating and dm tobbtei, If any. can usually be stroked out by hand ... a ruder --4 -- f pf I w S-iUppi - ; iui~*a.euwi.a^*uaig^ - *f LIA14177 *r-- ." i i (Uwn poller, for tunpie) can speed up (he work U high pro duction ram ere areded. Give (he cement adequate (lute for tolveal evaporation during (he Initial drying period before meting the sheets. especially when working with Urge sheets, becautc lead It tapenneibU to the icfvcM vapor and cure to final strength will be very alow If loo much solvent is trapped. EMULSION CEMENTS Three arc quite limilar to the contact cements except that they are thicker and they tend to be slower in drying and curing. They arc quite useful la lam matmg lead to porous surfaces like masonry. The comments on contacts, generally, apply. EPOXY CEMENTS This is quite a Urge family of two-part chemical adhe- O uvea. While a wide range of properties is available within / )t/s --- -y-- -- . mi wu Hungs. ifawiw SO most corrosives, and capable of withstanding moderately high temperatures. Some cpoiics cure to quite hard, even brittle states. While these may have special applica tions, a is generally better to use a softer material which cc*es to the hardness of your thumbnail since the added compiaracc helps make up for differences between the thermal evpaninn of lead and *hc adhesive. On the debit side, epoxies range from moderately ex- pensive to cry expensive. Their pot life h limited -- once mixed, they have to be applied ,-ehin a few m'eutes or hours and there is no way of usefaBy saving the remainder us' a batch. TO USE EPOXY CEMENTS I. MAKE SURE THE SURFACES ARE CLEAN AND OtLFREE. X Mix the two (or more) parts carefully and thoroughly accord ing K the manufacturer's directions. 3. Apply as thinly at it recommended or needed (good Joints do not require much epotty). --S-- 1 .^ypwsrpp!|p^pBpp pam jU iim m w ian'XU' 7 > ____ r i. k. Sk1