Document MGEG27q488vavMM8G83OMrJ99

- .v^ i4: \**/-* -' ;< Li- V- * j * -Jr^n ' : . ?. ^;aw,,> -i . . ? . .... ARMSTRONGS INSULATION SUNDRIES ARMSTRONG CORK COMPANY BUILDING MATERIALS DIVISION PENNSYLVANIA A* The Importance of Proper Sundries In Cold Room Construction On the avenge low-temperature insulation job, the sundry items represent a very small percentage of the allover cost figure. Yet, they are just as im portant to the life and efficiency of the installation as are the insulating materials chosen and the akill of the workmen who install them. Actually, the sundry materials used can mean the difference be tween good and poor cold room performance. That's because sundries have three important tasks to perform. They must seal moisture out of the insulating material, hold it firmly in place, and pro vide a neat and practical finish. Sundries that do these three things well will keep refrigeration and maintenance costs low and add years to the life of insulated construction. One of the most important jobs sundries must do is protect the insulation against vapor. Let's see why. Unseen moisture is always present in air in the form of vapor. That moisture is actually part of the air; it can go anywhere that air can go. No building ma terials in common use today are absolutely impervi ous to penetration by air and the moisture it contains. Airborne moisture is driven through building walls by three factors: wind pressure, vapor pressure, and stack effect The most powerful of these forces is wind pressure. Here's how it works. Wind Pressure A 30-mile-an-hour wind blowing against a 13" thick brick wall will drive 21 cubic feet of air an hour through every square foot of wail surface. With an outside temperature of 80 F, and a relative humid ity of 70%, 18 gallons of water would be forced through 200 square faet of wall surface every 24 hours. Vapor Pressure Even when the wind isn't blowing, plenty of moisture will get through the wells of a low-temperature room. When the temperature inside the^roem is towered, the air is chilled and moisture condenses out of it The warm air outside then contains more moisture than the air in the room. This difference sets up a natural force called vapor pressure, which pushes vapor right through the construction. Stack Effect Lowering the temperature inside a room also sets up a movement of warm outside air toward cold inside air. When this warm air has worked its way through the wall, it ia cooled and falls toward the floor. As it is cooled, the air loses volume, or shrinks. The downward movement of the air, combined with its shrinking causes a partial vacuum at the top of the room. Warm air pushes in to overcome the vac uum and a constant current develops, bringing still more moisture through the wall. This is a stack effect When the inside of the wall is lined with an insu lating material and low temperatures are held within I--------- _--------- ----------------------- ---- ------------------------ Ir *. . ihe room, dew point ;ilso viucis the piL'tuiir. Tins is the point where the incoming -nr it coulvd to the extent that moisture in that- .nr ronden>es .mil is left behind :n the form of water. Almost invariably, this point is somewhere within the insulation itself. If the insulation absorbs water, it soon loses its effi ciency, for water it a good conductor of heat. If temperatures are low enough to turn the condensa tion to ice, the pressures set up can lift a concrete floor, or buckle an insulated wait. Then the whole job must be torn out and the room re-insulated. Preventing Moisture Damage The first step in preventing this costly damage is to seal the inner side of the building wall against air and moisture passage. That's a job for a good asphal tic priming paint, applied after masonry walls have been made even with port land cement back plaster. To do a good sealing job. the paint used must hold up for many years and resist cracking and deteriora tion as it ages. It must not slip or sag for sun tem peratures on building walls can go as high as 1S0C F, and temperatures well over 100 F, can then de velop at the paint film. An inferior quality asphaltic paint cannot be relied upon for satisfactory service under these severe conditions. The mast important sundry material used for hold ing the insulation securely in place is the hot asphalt in which it is applied. The bond between the prim ing paint end the asphalt is only as good as the asphalt used. It must be tough and strong and have minimum susceptibility to temperature change. It must not be in nseli subject ti' cliemic.il rhtinge, iiiJ hns to mamtuin ihrsc qua I lilt's for many years ` The use of mi inferior .isplult that slips or sags or loses its bonding properties can only result in need less expense for repair and maintenance. The deteriorating effects of moisture must also be reckoned with in the wooden skewers used to hold layers of insulation together, and the nails that anchor the material to wooden construction. Wooden skew ers must be chemically treated to resist rot and fungus growth, and nails galvanized to prevent rusting. The use of any other type lessens the allover efficiency of the low-temperature insulation job. Sundries used for finishing low-temperature insula tion also must possess cenain qualities if they are to perform well. Asphalt emulsions used for inte rior room finishes, for example, should be clay-type emulsions. This type permits the use of soft asphalts in formulation. These asphalts will give flexibility to the finish, and the clay will provide the strength needed to eliminate flowing of the finish, either hot or cold. Clay-type emulsions also are stable and will not rub off when they are wet. In addition to sundries needed in the applications described here. Armstrong makes many other sundry items for every phase ol low-temperature work. Each one is formulated to withstand the severe conditions found in low-temperature construction. They are the result of years of experiment and research in the most efficient methods of installing insulation. Each product has been specialty developed for the phase of the job where its use is recommended. Auborns mciitui* is driven through building waits by VAPOR PRESSURE. Airborne moiitur* it dnvm through building wells by STACK EFFECT. Armstrong's Erection Materials No. 3 Asphaltic Priming Paint--This paint hai been spe cially developed for priming masonry, concrete, or Portland cement plaster surfaces prior to the erection of insulation in hot asphalt or cold erection plastic. No. 3 Paint pene trates the pores of the surface to which it is applied and forms a tough film which helps seal the wall against air and vapor penetration.' It also provides a strong bond with the hot asphalt or cold erection plastic which follows. This paint will not slip or sag at high temperatures or crack and peel at low temperature*. It becomes stronger with age. No. 3 Paint should not be used as a finishing material. Coverage--100 sq. ft. per gallon sprayed on in two coats, 75 sq. ft. per gallon brushed on in one coat. Packaging-- I- and 5-gallon pails and 30- and 55-gallon drums. Weight of No. 3 Paint U SV4 lbs. per gallon. No. 4 Asphaltic Priming Paint--This paint is required fo: priming steel or other metal surfaces before application 3 low-temperature insulation in either hot asphalt, cold ertc tion plastic, or adhesives. It greatly strengthens the bom: between these agents and the metal surface, and at the u->t time prevents corrosion and rusting of the metal. No. 4 Asphaltic Paint forms a strong, long-lasting film which 5 extremely high resistance to moisture as well as acids, alks t. and chemical fumes. Coverage--Approximately 150 sq. ft^per gallon. Packaging--1- and 5-gallon cans and 30- and 55-g3" 3 drums. Weight of No. 4 Paint is 9 lbs. per gallon. Erection Asphalt--This is a 180 = to 200: F. melting point, oxidised asphalt specially formulated for erecting Armstrong's Corkboard to walls, floors, ceilings, ducts, columns, and other applications. The asphalt is odorless, is not subject to chemical change, resists cracking or softening under extreme temperature variations, and maintains these desirable quali ties for many years. It furnishes a tough, lasting bond be tween the insulation and the primed wall, and helps seal out air and moisture. Coverage--Four-tenths of a pound of Armstrong's Erection Asphalt wilt cover approximately one sq. ft. of wall surface. Packaging--450-lb. drums displacing about 8.6 cubic feet. Also packaged in 100-lb. paper wrapped rolls. N. 340 Waterproof Cement--This :i ,i mvihuin body ce ment fur erection ol corklmnrri msul.iliun .ig:nn*l mct.il sur face*. It wiil ,tso adhere tightly to concrete and ptusler. No- 340 Cement is easy to work and possesses the high initial strength necessary to support the weight Of the insulation without reinforcing. It remains plastic after drying and shrinks only slightly during the setting and drying period. Coverage--30 sq. ft. per gallon, applied with a notched trowel. Packaging--l- and S-gallon cans. Weighs 12 Vi lbs, per gal. V Galvanised Nails--These hot-galvanized nails, with li" diameter heads and thin shanks, are used to secure the first layer of insulation against wood surfaces and for toe* nailing the first layer in partitions of solid corkboard. Two nails should be used per square foot of wall, three per square foot of ceilings. They are available in the following sizes: 3" X No. 9. 4" X No. 9. 5V" x No. 8. and 7>4" * No. *. Insulating Paper--This is a black paper saturated and coat ed with pure asphalt. It is used as a vapor seal when erect* ing insulation against wood and frame construction* In application, joints should be lapped not less than 3". Packaging--36" wide rolls, each containing 500 sq. ft. Weight of this asphalt-coated insulating paper is 38 lbs. per roll. 1-i. 'IV... ... - Hardwood Skewers--These hardwood skewers are specially treated with an odorless preservative to prevent mold growth and dry rot. They are used to secure the second and suc ceeding layers of corkboard to the preceding layer. Use two skewers per square foot for wall insulation and partitions of solid insulation, three per square foot for ceilings. Skewers are 4Vj", 5 bs", and 7" in length--in diameter. _ Ht. ' i. Cold Erection Plastic--This mstcrul IS used for erecting low-temperature insulation where the use of hot asphalt i impractical or dangerous. It is made with erection asphalt, dissolved in a solvent and mixed with a filler. This plastic should not be used where the solvent odor might taint food stuffs or where ventilation during application is poor. Coverage--25 SO, ft. per gallon in a coat 1 16" thick. Packaging--1- and 5-gal!on cans and 30- and 55-gallon drums. Weight of this product is 11 *-> lbs. per gallon. Armstrong's Finishing Materials Asphalt Emulsion--'This material is the basic ingredient for Armstrong's Plastic Emulsion Finish. This is a durable, moisture-resistant finish for corkboard insulation. Asphalt Emulsion is a clay emulsion of high-grade, finely dispersed asphalt which, when mixed according to the following formula, can be troweled directly onto the surface of the insulating ma terial. Mix as follows: SO gallons Armstrong's Asphalt Emulsion 112 lbs. asbestos fibers 275 lbs. (244 cu. ft) dry, screened sand 15 gallons clean water Where s sand finish on the interior of the cold room is desired, this mix ture may be used for both first and second coats. Coverage--15 sq. ft for each gallon of Armstrong's Asphalt Emulsion, when applied in two coats to a final thickness of when dry. Packaging--Armstrong's Asphalt Emulsion is packaged in 1- and Station cans and 30- and 55-gallon drums. It weighs 9 Vi lbs. per gallon. Plastic EmuItion--This product is a complete asphalt plastic finish ready for application as received. It is a mixture of Armstrong's Asphalt Emul sion, asbestos fibers, sand, and water. Plastic Emulsion is troweled di rectly to the insulation surface in two coats. Covcrage--8 sq. ft per gallon for a two<oet_surfaC*. Packaging--1- and 5-gallon cans and 30- and 55-gallon drums. Plastic Emulsion weighs 11 lbs. per gallon. S. P. Emulsion--This is a factory-mixed combination of Armstrong's Asphalt Emulsion and asbestos fibers, ready for application to insulation surfaces. It is used when a smooth, plastic finish is desired. The emul sion is troweled on directly in two coats to a final thickness of approxi mately when dry. Armstrong's S. P. Emulsion may be mixed with sand when a sand finish is desired. Mix as follows: 50 gallons Armstrong's 5. P. Emulsion 1751b*. (I-Vi cu. ft.) dry. screened sand tj^iVatcr for tampering This mixture should be troweled bn the insulation surface in two coats. Coverage--9 sq. ft. of two-coat surface for each gallon. Packaging--1- and 5-gallon cans and 30. and 55-gallon drums. Weight of Armstrong's S. P. Emulsion is 10 lbs. per gallon. Note: Armuiwi'i S. P . Plastic, and Atpnatt gmulitoni should not be applied when the temperature it below 40* F. Heat and fant should be provided it necessary to maintain thit temperature until the ftrnth 11 thoroughly dry. When dry, the liniih can be tubjected to temperature! at low at ]5* below icro. Insulmastic--Insulmastic is * factory-mixed combination of Armstrong'-. Asphalt Emulsion with special fibers and fillers. It t recommended for use where a fire-resistant finish is required. Applied in two coats, each approximately l " thick. Insulmastic is an excellent finishing material for low-temperature insulation exposed to the weather. Onhigh tower*, spher ical and cylindrical vessels, elevated lines, etc- galvanued wire mesh should be applied directly to the insulation before Insulmastic is troweled on. Armstrong's Insulmastic possesses the tensile strength necessary to with stand normal movement without cracking or rupturing, is not affected by temperature changes, does not slip or sag at high temperatures, and bonds well with the corkboard insulation surfaces. When Insulmastic is applied in twp coats, each about Vi" thick, it will dry to a final thickness of 3/16". . Coverage--In a two-coat finish, two pounds of Insulmastic will cover one square foot of insulation surface. Packaging--SO-. 300-, and S00-lb. drums. Weight is 10 lbs. per gallon. Aluminum Cold Storage Paint---This paint provides a light-reflective finish for asphaltic surfaces. It does not discolor due to bleeding through of the asphalt, is odorless when dry, and does not crack at low tempera* tares. This Aluminum Cold Storage Paint should not be used on wood, metal, or any surfaces other than asphaltic ones. It is shipped as liquid and powder, packaged separately, which must be thoroughly mixed just prior to using. Coverage--One gallon will cover 250 square feet in two coats. Packaging---Vi- 1-, and 5-gallon cans. It weighs 9 lbs. per gallon. No. 27-8 Seam Filler--This is an asphalt mastic compound designed to fill and seal the joints between pieces of Armstrong's Mastic Finish Corkboard. It has been specially developed to withstand the low tempera ture used in refrigerated construction. It is applied with a pointing trowel and will not shrink out of joints. Coverage--One gallon of No. 27-B Seam Filler is shipped as a sundry with avery 150 square feet of Armstrong's Mastic Finish Corkboard. Packaging--Vi-, 1-. and 5-gallon cans. Weight is 13 V* lbs. per gallon. ^ Asbestos Floats--These floats are a special grade of asbestos fiber used for mixing with asphalt emulsion. They give a dense, tough, hard quality to the fina|_asphaU plastic finish applied to walls of low-temperature rooms. Packaging--Asbestos floats are packaged in 100-lb. bags. Fine Regranulated Cork^--This product consists of fine particles of Arm strong's Corkboard and is used wherever the application of cork in board form impractical. Regranulated cork is principally used as a filler around tanks and vessels and in small and irregularly shaped spaces. Fine retranslated cork has good insulating qualities, possesses the high natural mowbre resistance inherent in all cork, and resists packing and settling. This material includes all baked cork particles that will pass through an 8-mesh screen. Packaging--Fine regranulated cork is packed in bags containing approxi mately 7 cu. ft. Weight is about 5 lbs. per cubic foot. The Importance of Proper Sundries In Applying Cork Covering Sundries chat seal out moisture, hold the insulation firmly in place, and give it a neat, finished appear ance are just as important for cold line insulation as they are for the insulation of low-temperature rooms. Any opening that allows air to work its way into the covering on cold lines is an invitation to trouble. As that air nears the pipe, it is cooled, the moisture condenses, and water is deposited in the insulating material Water conduct* heat, and the heat-retarding properties of the insulation decrease in direct pro portion to the amount of water present. If the tem perature in the line is low enough, the-condensation will turn to frost. In time, the growth of ice crystals can break up the insulating material and cause com plete loss of insulating efficiency. A naturally moisture-resistant pipe insulation like Armstrongs Cork Covering will resist this damage far better than absorbent coverings. However, the performance of cork covering can be greatly im proved if .applied with the right sundries. The adhesive used at the joints in the covering should be waterproof to seal out air and moisture. Copperclad steel wire should be used to hold the sections firmly Tn-ptace. This is a special wire drawn from a steel-c-ocad copper billet. It combines the strength of sieeijwith the corrosion resistance of copper. Regu lar copper wire is not satisfactory, because it will stretch and allow the covering to loosen. Steel or galvanised wire lacks the needed corrosion resistance. The asphaltic paint used to finish cold- fine insulation must also have certain properties if it is to do its job properly. This paint is the final seal on the outer face of the insulation and should hold up with age if it is to keep air and moisture out. The paint should set to a tough, hard finish that will not slip or sag under heat. It should remain tough, and not dry out and crack and peel in a short time, as often happen* with inferior type asphaltic paints. All of the sundries recommended for use with Arm strong's Cork Covering have been formulated to make each cork covering installation last longer with less maintenance. Used properly, they will do just that. No. 299 Waterproof Cement--This is a waterproof, alkali- and acid-resistant cement that is quick setting and strong. It should be applied only to the surface that will be immediately placed in contact with an ad joining surface. It is neces sary to coat only one of two adjoining surfaces with No. 299" Waterproof Cement. Coverage--35 sq. ft. per gal lon for joint areas. Packaging--1- and 5-gallon cans. Weighs 12 lbs. per gallon. Copper-Clad Steel Wire--This wire is used to hold the covering firmly in place on the line or fitting. It is a special copper-jacketed steel wire, drawn from a steel-cored copper billet and combines the strength of steel with the corrosion resistance of copper. This wire is available in the following gauge* and weights: S end S Wire No. 14 No. 12 No. 10 Lb*, per Fi. .0015 .0183 .0291 Galvanised Bands and Seals--Galv;,nirctl bumls rind seal* are substituted for wire at no extra cost tor use in applying cork lagging and the larger sires of cork covering. These straps and seals are double electrogalvanized to provide high resistance to corrosion. Tools for application of special seals are available on request. For applications where corrosive or special at mospheric conditions ex ist stainless steel or Monel strapping and seals should be substi tuted for galvanized. Sise of Galvanised Bands *4 x .015 Vi x .020 % x .020 y x .035 Gauge 25 25 25 20 _ .. Lbt. per Ft. .0256 .034 .0526 _ ;0?91 . No. 27-8 Seam Filler--This asphalt mastic compound is designed to fill and seal the joints between sections of pipe covering or fitting covers. It has been specially developed to withstand low temper atures. The proper quan tity is supplied with all orders for cork covering. Packaging--Vi-, 1-, and 5-gallon cans. Weighs 13 Vi lbs. per gallon. Fitting F iller--Armstrong offers two materials for use in sealing off joints and filling voids between fittings on cold lines and the cork firting covers. Armstrongs Fitting Filter is made by mixing molten paraffin wax and cork panicles. This mixture is poured into fitting covers to eliminate all voids be tween fitting and cork cover. The amount of fitting filler necessary for correct application is shipped as a sundry with every shipment of cork covering. Brine putty is a mixture of cork particles and special asphalts primarily used for filling voids and large joints before the appli cation of Armstrong's No. 27-B Seal Filler. Weight^Both products weigh 56 lbs. per cubic foot when mixed. No. 1 Cork Covering Faint-- Thu is a lirs;h graikasphnltic paint that should not be confused with ordinary asphalt paint. After cork covering ha* been applied, this paint is used to provide a glossy black finish for the installation. Where any asphaltic sur face is not exposed to weather. Armstrong's No. 1 Cork Covering Paint furnishes long-lasting protection against vapor infiltration. All cork pipe covering and all insulated tanks and equipment located indoors should receive a coat of this paint annually. Coverage -- 180 sq. ft. per gallon of brush coat. Packaging -- 1- and 5gallon cans. Weighs SVi lbs. per gallon. Sofvopruf--This is a solvent-proof finishing and adhesive material for use with corkboard or cork covering. Solvoprufi resists the deteriorating effects of benzol, toluol, methyl ethyl ketone, gasoline, and kerosene. It is recommended in place of asphaltic finishes where solvent resistance is required. Solvoprui is applied to here cork surfaces with a brush or troweL When set, it retains its plasticity at temperatures from 35* below zero to 125 F. Coverage--50 sq. ft. per gallon over uncoated cork insulation as a finish. 100 sq. ft. per gallon as a primer or an adhesive. Packaging -- Furnished in a unit consisting of a separate 5-gallon con tainer of Mix A and five 6-oi. bottles _fif Mix B. One bottle of B is com bined with one gallon of Mix A before applying. Se-jafrCMS CC Navy Sealer--This is a specially developed, fireresistant vapor barrier used to coat both inner and outer faces of cork covering, and as the adhesive on ail joints. When this sealer is used, and the covering is applied with copper-clad steel wire, the installa tion meets all requirements of Military Specifica tion MIL-876A. Covering should be ordered un finished, as CC Navy Sealer is applied to bare cork surfaces. Coverage -- 35 square feet per gallon in a 1 16" thick coat. Packaging -- I- and 5- gallon containers. Armstrong's Cork Insulation and Armstrong's Contract Service Armstrong's Corkboard is nude of carefully sized granules of cork, compressed and baked into board form. Millions of tiny air cells in each granule serve as an effective barrier to the passage of heat. The unique cellular composition also seals moisture out because the tough walled cells fit together so perfectly that there is no space between them where it can collect. Corkboard is strong, tough, will not shrink, swell, or warp and is self-supporting to a height of 14'. It is classified as a fire-retardant material. In addition to Standard Corkboard, two other types are available for special service condi tions. These are Armstrong's Super-Service Corkboard. coated with factory-applied as phalt on both faces, and Armstrong's Mastic- Finish Corkboard, which has a asphalt mastic finish on one face. Aviilabte Siaes: 12" x 36^ 18" x 36", 24" x 36", 36" ,x 36" Available Thicknesses: l"..l Vi". 2". 3".,4". 6" Armstrong's Cork Covering on cold lines prevents 80',' to more than 90',' of the re frigeration loss that would occur if the lines were left uninsulated. As a result, this ma terial pays for itself in a few years. It also eliminates condensation and drip and the ac companying rusting and depreciation of cold lines located in warm areas. Armstrong's Cork Covering has high insulat ing efficiency and high natural moisture re sistance. It is made in exact sizes for easy application to pipes and fittings. Fitting covers are made in the same thick nesses as pipe covering and are designed for all types of ells. tees, valves, flanges, unions, etc. Cork covering is manufactured in three regu lar thicknesses, and in special thicknesses to meet different service conditions. Alt thick nesses are made to fit standard pipe and copper tubing from up and are furnished in 36" lengths. ARMSTRONG'S CONTRACTING ORGANIZATION Armstrong is not only a manufacturer of indus trial insulations but also a contractor for the application of these products, operating through 46 district and branch offices covering most of the large trading areas in the country. Our national organisation can offer unusually efficient service to alt types of insulation buyers. Take, for example, a large engineering company having home offices on the Atlantic Seaboard, and buying insulation work along the Cutf Coast or in the Far West. Armstrong's well-knit or ganization can help the home office engineers develop plans and specifications. Then the actual installation can be carried out with com plete understanding by another Armstrong office in the territory where the work is being done. Thus the engineering Arm has the advantage of being able to work all over the country with a familiar organization. Paper work is handled in the tame manner on every job so that mis understandings are eliminated, communications are simplified, and costs are reduced. Not only the large engineering company but also every other insulation buyer may feel free at any time to call upon the services of the trained engineers who staff each Armstrong dis trict office. In addition to the engineering ad vice available through these field offices, the company maintains at the home offices a staff of engineers and research scientists whose job it is to work on the solution of especially diffi cult problems involving industrial insulations. In the field, trained construction superintend ents direct all contract installation in their areas. Working directly under these men are construc tion foremen whose responsibility it is to get the job done properly. All of the people in the Armstrong Con tracting Organization have been trained in the tradition of good workmanship. Our long ex perience in the insulation business has con vinced us that even the best materials cannot perform at a high degree of efficiency year after year unless they ere properly installed. 1. , I1*- JWJ' . '. .~5'48&l3-; ** -:i;:; ?*' " i-J -"*! ' ?*v j ARMSTRONG OFFICES Albany Allentown Anchor,(# Atlanta Saltimort Birmingham Boiton Buffalo Charlotta Chioafo Cincinnati Cleveland - Columbui Dallaa Denver Detroit Evaruville Harriibur[ Hartford Houston Indiana polia Jaekaonville Kansaa City Loa Ancelea Louiivilla Mamphia Milwaukee Minntapolia N.w Orleena Now York Omaha Phitadalphia Pittibur(h Portland Providence Richmond Rocheater ,, St. Louit Salt Loka City San Franciaco Seattle Spokane Syracuaa Tacoma Tulaa Wathincton. D. C. DISTRIBUTORS Chirleston 23, W. V*.. Capital City Supply Company Eau Claire. Wis,, Horel-Georje Company El Paso. Ti*a*. Cat* Industrie! Servie* Company Ft. Waynt. Ind., The Baidu* Company Grand Rapid*. Mich.. Tony Batenbur| Insulation Conpenv Grrn Bay. Wiv. Northwestern Asbestos and Cork Insulation Jameua'An. N, Y.. Laco Rooftnt 4s Asbestos Companv Joplin. Mo., Joplin Cement Company Manitowoc. Wi*., Northwestern Asbestos and Cork Insulation Co. Phoenix, Arijoru. Barrett 4s Home* Salt Lake City. Utah, Asbestos Enc>neerin( and Supply Co. San Antonio, Te**v General Supply Company. Inc. South Bend 23, Ind., Midland Engineering Company Springfield, Mo., Southwestern Insulation Company 1M.JIS1 D Pimted ia United Stetf* ef Ammr St--. e J . - -t t* i* m f "