Document X74Ekxk6pe5bVOQ3DE8ro8d4J

easy to erect, needs no maintenance, saves fuel Johns-Manville Marinite is an insulating sheet material composed of asbestos fiber, diatomaceous silica and an inorganic binder. Because it is both a structural and an insulating material, it offers major economic advan tages in the construction of ovens, driers and other pro cess equipment requiring a housing for the retention and control of heat. Marinite is the only insulation available that can be erected without the metal sheath ing necessary when mineral-wool-fiber type and similar insulating materials are employed. Marinite combines great structural strength with light weight and excellent thermal properties. It is fireproof and has a low thermal expansion coefficient. Marinite is completely non-corroding and will not disintegrate after prolonged immersion in water. Marinite is furnished in three different densities: 23, 36 and 65 pounds per cubic foot. Marinite-23 has the best thermal insulating characteristic and is recom mended for use where insulating value takes preced ence over structural strength. Marinite-65, having the greatest structural strength, is recommended where strength is of paramount importance. Marinite-36, combining both good insulating and structural proper ties, is recommended for most applications. All three densities of Marinite are supplied in two types, A and B. Type A sheets, with a plain sanded finish on both sides, are recommended where painting is not required. Type B sheets are also sanded on both sides, but in addition are impregnated with an inor ganic primer and are ready for subsequent painting. P@eip@d fe fieip prevent fires f see When the American cruise ship Morro Castle caught fire and was beached on the New Jersey coast with a large loss of life in September, 1934, laws designed to prevent the recurrence of this appalling tragedy were speedily enacted. These laws required the construction of firescreen bulkheads at specified intervals along the length of all passenger vessels, as well as the enclosure of all staterooms, passageways, offices and similar areas, with incombustible material. This fire-proofing requirement for passenger ships built to sail under American registry led to the develop ment of Johns-Manville Marinite. 44" Marinite successfully passes the rigid Coast Guard B-15 bulkhead requirement which specifies that bulk head panels shall be so constructed that, if subjected to the standard fire test reaching 1400F in 15 minutes and 1550F in one-half hour, they shall be capable of pre venting the passage of flame for one-half hour. In ad dition, the requirement specifies that the insulation value of each panel must be such that the temperature of the unexposed side will not rise more than 250F above the original temperature within 15 minutes. Sufficient proof of the excellence of Marinite is the fact that commencing with the construction of the SS America, it has been installed on every American flag passenger vessel built since the early 1940's--as well as the majority of all American cargo ships built during the same period. For details see J-M brochure IN-109A, Johns-Manville Marinite Joiner Panels. Coating tower, 41 feet high, built and insulated with Johns-Manvili Marinite by Electro Technical Products, Nutley, New Jersey. A&a&Ha MARI HITE IS EASY ? ERECT With a surface hardness comparable to yellow pine, Marinite can be readily worked without special tools or costly equipment. It can be cut or machined to any de sired shape, and will take screws and nails like lumber. The ease of cutting and drilling this versatile material permits observation holes, ports, etc., to be readily in corporated in the equipment during construction. Regardless of the size of the job, Marinite can be han dled and applied by your own construction staff with out special training. Because Marinite is strong and rigid, and comes in large sheets*, the angle-iron fram ing supports can be widely spaced and reduced in num ber. This speeds construction, keeps labor costs at a minimum, reduces the time required to put the equip ment into active service. Where desired, Marinite can be prefabricated to your own drawings at our factory, or by one of the many local Johns-Manville contractors. *See table of Sizes and Thicknesses on page 15. MARINETE REDUCES HEAT LOSS In the usual type of oven or drier constructed of sheet metal and mineral-wool-fiber type insula tion, there exists a large amount of through-metal which tends to increase heat losses to the extent that the benefits resulting from the insu lation are, to a large degree, nullified. By "through-metal" is meant metal which extends from inner to outer door, wall or ceiling surface, and which provides an easy path for heat to escape. The use of Johns-Manville Marinite with broken-joint panel construction eliminates practically all through-metal and provides uniform temperature con trol throughout the equipment. More over, because it is an homogeneous ma ' terial, Marinite never loses its insulating qualities through settling or sagging ... This small, gas-fired testing oven employs double-layer, staggered-joint Marinite construction. Because of Marinite's excel lent thermal properties the oven can be operated at 650F all day long without becoming hot on the outside. MARINITE REQUIRES MO M&IMIEMAMCE prevents the occurrence of local "hot spots." The method of installing Marinite panels in a band type oven is clearly illustrated in the photograph below. In this picture (a detail close-up of the illustration on page 9) it will be noted that angle-iron framing is erected on the outside of the insulation to reduce the thermal expansion of the metal. Where the panels join, a staggered-joint, with no framing between, is used to insure a tight seal against the escape of heat. Panels are units built up of multi-layers of Marinite bolted to gether and fastened to the framing with a minimum number of key bolts. Where sheet metal panel construction with mineralwool-fiber type insulation is used for building ovens and driers, the inner faces of the metal walls, i.e., the faces in contact with the insulation fill -- difficult or impossible to keep properly coated with preservatives --are particularly susceptible to corrosion as a result of moisture condensation during cyclic shut-downs. This results in high maintenance and replacement costs, and is the source of much trouble. Such a condition never occurs with Marinite because moisture will not cause Marinite to rot or corrode. Marinite requires no pro tective painting or coating under normal conditions, and it leaves no voids to collect water. The completely inorganic composition of Marinite renders it immune to decay and unattractive to vermin and rodents. It will not support the micro-organisms that cause mold growth. Marinite retains its attrac tive appearance without special care, requires only an occassional wiping or dusting with a clean cloth, and will last indefinitely. Band type drying oven is constructed of multi-layer Marinite panels bolted together and secured to angle-iron framing. Staggered joints reduce through-metal to a minimum, keep insulating effec tiveness high. ill litany ways^ as a structurally strong, fireproof insulating sheet material -- Protected by structurally strong, fireproof Manmte bulkheads, passengers on American ships sleep afely as well as comfortably. -- Uniformly crisp, perfectly baked cookies testify to the uniform temperatures maintained in this modern Marinite bakery oven. PLASTICS -- Plastics manufacturer whose maintenance force built tf Marinite drying oven reports: "No specialized skills or tools were needed -- Marinite speeds production, reduces maintenance-replacement costs to a minimum in this 75 foot tenterframe housing. APP. s:'" -- Restaurants require modern equipment that turns out prop erly cooked food every time. This Marinite restaurant oven does just that. Recommendations on handling and fabricating The following procedure is recommended in order that work may progress smoothly and efficiently: ,, Detailed sketches should be prepared by the carpenter, superintendent or V | engineering department to permit cutting and drilling of the Marinite prior 1 to fitting in place. This will minimize cutting and scaffolding (where it is " | necessary) at the point of erection. 2 3 4 5 | Power-cutting equipment should be used on the job to effect maximum con i struction savings. The use of untrimmed* Marinite sheets, furnished ap proximately 1", over-size in length and width but unsquared, will also effect savings. The extra material (approximately W on both dimensions after squaring) will reduce losses due to saw kerfs. ' Marinite sheets should be piled convenient to the cutting equipment. Wherever possible, templets should be used for drilling, especially where duplicate pieces occur. (See illustration on page 11.) Only bolting or screwing should be required at the actual point of appli cation or erection. Hand sawing and fitting should be reduced to a minimum. *Available on special order. Marinite is amply strong for the service intended, but the nature of its composition is such that it should be handled with a little more care than more common structural ma terials to avoid marring or breaking. For example, when removing sheets from piles: 1 Slide the top sheet at a slight angle to allow for a hand hold. Then lift at ! each corner (two men to a sheet are sufficient) taking care to prevent a i corner from ripping across the face of the next undersheet. 2 3 Turn the sheet edgewise and carry in this position. This is not only more convenient, but will minimize whipping of the sheet and eliminate a source of possible fracture. Reverse these operations when laying a sheet on a truck, pile, or finishing table. 4 Avoid sliding the faces of Marinite sheets over one another whenever pos sible. Do not walk on sheets, and avoid dropping heavy objects on them to prevent marring of the finish. PELING OF SHEETS Piles can be carried to any desired height without ; fecting the material, provided the base is true and lev Otherwise the lower sheets will be deformed, t! amount of deformation being dependent upon d height of the pile. For convenient unloading of ti pile, however, its height should be limited to 5 fee If sheets are piled on 4 x 4's, or similar bases, spacin should not exceed 24" on centers. Where possible, Marinite should be stored under covet out of the weather. If necessary to store outdoors, th> sheets should be completely covered with waterproo tarpaulins and supported free from ground water tc avoid possible discoloration. While water has no ef fect on the chemical composition or strength of the material, it will make cutting more difficult and add to the weight of the sheet. Also, Type B (primed) material must be thoroughly dry before painting or peeling of the paint film may result. Vr 0 ft K t ft G OP MAR I MI T1 Pente ' -Jdarinite can be cut with an ordinary car- ,fS an sawl or power saws (equipped with cutting steel blades) of the circular, radial, band l!g type. However, since the composition of the ma teria tends to dull steel saws quickly, the use of carbide- npped saws or abrasive wheels on floor or bench type power saws, or portable heavy-duty saws, has proved lost successful. If some cutting is necessary at the oint of application or erection, either a carpenter's ind saw or a portable power saw can be used .Allow ices must be wade for the saw kerf in all cases when ptring the number of pieces to be cut from a sheet sufficient quantities of Marinite are to he cut an vestment in proper equipment will pay ie; use!: ith circular and radial saws have been used sue.r-n ly. The circular saw is recommended becauvr o <re readily permits the collection of Just u: , g by means of an exhaust located 'ACl'l'. - o, the cutting wheel can be htt;cex! v. j. w. rd and rends to carry the o operator. Marinite should s pc uid not be fed into the : overheating, w/th constej. tupidi-, t; hmviifu c r->. irr e-n i n .a _ 1 continued POWER SAW CUTTING (Floor or bench type circular saw) fo; stationary power cutting A floor or bench type circular saw equipped with a carbide-tipped saw or abrasive wheel located beneath the table is recommended. Such ma chines will generally permit cutting at the rate of 300 to 500 linear feet of 1" thick Marinite-36 per hour, including time to handle the material on and off the machine. The table should be equipped with an adjust able guide capable of being clamped rigidly in place for cutting differing widths. A wheel guard should also be provided. An auxiliary metal-faced table top (can be constructed of wood) placed at the far end of the power saw, and a roller table placed at its side will provide support and permit easy sliding of the 4' x 8' sheets when cut ting. These tables should, of course, be level with the top of the saw table. 3 Some means for removing the dust from cutting operations should be provided. Many of the floor type circular saws are equipped with a spout within the base for connection to a dust-collecting system. for small fobs NG Where small quantities of material are to be cut, a portable heavy-duty power saw, equipped with a car bide-tipped saw or an abrasive wheel, is recommended. It is suggested that with this type of equipment, a 'res pirator be worn by the operator, and that an air hose be attached to the frame to blow dust away from the operator. E R' R R f YI t l r M C ' Electric power drills equipped with steel-working drills render drilling of Marinite effortless, and should be used whenever available. Where extensive drilling is required, power drills should be considered a necessary investment which will save both time and labor. Bev elling and similar cutting can be done with wood-joiner tools, or with special-width abrasive wheels. . SCREW SieyHEMifMT When using screws in Marinite, preliminary holes should always be drilled. Sheet metal screws are rec ommended in preference to wood screws. Where Type A sheet metal screws are used, the recommended drill sizes are as follows: To prevent stripping of the thread in the material, screws should not be turned after they have been screwed "home." A round-head, No. 10" x Y%" Type A sheet metal screw correctly turned in a properly pre-drilled hole will withstand a pullout load of ap proximately 130 lb in Marinite-23, 240 lb in Marinite36 and 460 lb in Marinite-65. PAINTING MAHIWITE Marinite Type A, as generally used for the construc tion of ovens, driers and other industrial equipment, requires no painting. If external painting is desired for appearance purposes, Marinite Type B (primed) should be used. All freshly cut edges, including the edges of holes and ports, that will subsequently be painted, should be given a coat of boiled linseed oil, allowing time for drying prior to painting. In applying paint, the manufacturer's directions for thinning, dry ing time, etc., should be followed. It is important to remember that Marinite is not a vapor barrier, there fore, any paint used should also be pervious to the outward passage of moisture. Otherwise the moisture Marinite may be readily fabricated into special shapes. will be trapped in the material, causing the paint to blister. For the selection of a suitable exterior coating, the industrial finishes department of the following manu facturers may be consulted: E. I. Du Pont de Nemours & Co. Pittsburgh Plate Glass Co. Sherwin-Williams Paint Co. Socony-Vacuum Oil Co. Whenever it becomes necessary, for any reason, to apply paint to Marinite Type A, two coats of boiled linseed oil should be brushed on all exposed surfaces prior to painting, each coat being allowed to dry for at least 24 hours before the succeeding application. TYPICAL PRODUCTS FOREWORD Constructing a dryer or oven out of Johns-Manville Marinite is essentially quite simple. However, to insure proper operating efficiency and long life, several design details should foe kept in mind: Marinite will expand slightly when first heated to temperatures up to 250F. As tempera tures rise higher than 250F slight shrinkage occurs. In order to compensate for this movement bolt holes should be drilled at least 14" oversize as shown in drawings of sidewall and ceiling designs on page 13. Nuts should be hand-tightened only, and then backed off one-half turn. The following table gives the minimum total wall thicknesses of Marinite necessary to limit the effects of warpage resulting from expansion and shrinkage: Largest panel dimension, feet 100 to 200 31 41 61 81 10 1 201 to 300 1 1 1 1 2 Operating temperature--F 301 to 400 401 to 500 *501 to *601 to 600 700 Minimum total wail thickness, inches 11 22 12 23 23 34 23 4 5 34 S 6 *701 to 800 3 3 4 6 7 *801 to 900 3 4 5 6 8 *At temperatures above SOOF, only multiple layers of 1" thickness should be used Framing members for panel support should not be spaced on greater than 4' centers. To insure highest thermal effectiveness, staggered joint construction is recommended where 2 or more layers of Marinite are used in forming panels. In 1 -layer construction, joints should be covered with Marinite battens. The following drawings illustrate some of the recommended construction methods: CONSTRUCTION DETAIL! 1" MARINITE BATTEN / ANGLE IRON 5/16" BOLT 7/16" HOLE 1 1" MARINITE I /-OVERSIZE / HOLES CHANNEL IRON 7/16" /HOLE 5/16" BOLT 1" MARINITE OVERSIZE HOLES CHANNEL 7/16" HOLE 5/16" BOLT 1-LAYER CONSTRUCTION 2-LAYER STAGGERED-JOINT CONSTRUCTION -I-- 3-LAYER STAGGERBXIOWT CONSTRUCTION Marinite sidewall and ceiling designs. 2-LAYER STAGGBtByJOINT CONSTRUCTION 3-iAYB S!*GG*EDKXMT CONSTRUCTION TYPICAL CONSTRUCTION DETAILS continued n< ) . _rU_ ______ A_______________ --^___ v------------------- SECTION A-A Morinifo Sliding Door T33--U--"T SECTION A-A 2-Layer Staggered Joint Construction SECTION A-A 3-Layer Staggered Joint Construction 2-Layer Staggered 3-Layer Staggered Joint Construction Joint Construction UnrinSlo OkcArwafSon Part Marinite-23 Marinite-36 Marinite-65 Density, Dry, lb per cu ft Normal Moisture Content, % of dry weight Transverse Strength, Dry, Ultimate, psi Modulus of Elasticity, psi x lo-6 (irom transverse test) Consolidation, in. per in. under load of 500 psi Impact Resistance, Ultimate, inch-lb (15" span, 15" width, 1" radius head wt) 4 lb wt on Vi" thickness 6 lb wt on 1" thickness Screw Holding Power, Ultimate, lb (Sheet metal screws, Type A, Sizes 6-12) W' penetration 7/a" penetration Brineli Hardness, Dry 10 kg load, 10 mm ball, 10 sec 50 kg load, 10 mm bail, 10 sec Moisture Expansion, in. per in. Shrinkage, normal to dry Expansion, dry to 100% R. H. Expansion, drv to saturated Thermal Expansion, in. per in. per F x 10` avg over temperature range indicated (Detailed information for special cases furnished on request) Maximum Service Temperature, F (for continuous service) Conductivity, Btu in. per sq ft per F per hr at mean temperature 100F 200F 300F 400F 500F 600 F --------------------------------------------------------------------- ---------- \ i ! i .. i 21-25 5 (approx.) 550 0.15 0.030 max. _ 42 35 130 0.5 0.0008 0.0009 0.0010 2.0 up to 200F; shrinkage thereafter *900 0.55 0.57 0.58 0.60 0.61 0.63 34-38 5 (approx.) 900 0.40 0.025 max. 28 78 80 r----------------2--4--0---------- -- --1 _ 1.8 (Comparable to yellow pine) 0.0011 0.0011 0.0013 1.3 Up to 250F; shrinkage thereafter *900 0.76 0.77 0.78 0.79 0.80 0.81 60-70 5 (approx.) 1500 0.70 0.020 max. 60 150 180 460 _ 4.6 0.0011 0.0011 0.0013 2.6 up to 250F; shrinkage thereafter *800 1.50 1.56 1.62 1.68 1.74 1.80 *5ee page 12 for table of minimum total wall thicknesses necessary, depending on panel dimensions and operating temperature, to /imif effects of warpage resulting from expansion and shrinkage. tThe figures given above for the specified properties are average values obtained in accordance with accepted test methods. However, due to factors beyond our control, responsibility for the results obtained from the use of this information is not assumed. Ultimate strength figures must be modified by applying adequate factors of safety in arriving at working values, Standard Sizes and Thicknesses Material Marinite-23 Marinite-36 and Marinite-65 Sheet Sizes 36" x96" ' 42"x 96" 48"x 96" 48"X120"* 36"x 96" 42"x 96" 48"x 96" 48"x 120" Thicknesses 1", lV2"and 2"** %"f, Vz", %" and 1" *Can be furnished on request where volume warrants special run. **2" material furnished on request where volume warrants special run. tFurnished only in Marinite --65. Thickness, Inches Marinite-23 1 lVz 2 3 4 5 6 Marinite-36 2 3 4 5 6 100 25 10.6 7.63 5.98 4.17 3.19 2.59 2.18 13.4 7.84 6.09 4.29 3.50 2.96 Marinite*65--furnished on request. 200 125 53.9 38.9 30.4 21-1 16.2 13.2 11.1 68.2 39.4 28.0 21.6 17.6 14.9 Operating temperature-F 300 400 500 600 700 Difference between operating temperature and ambient air temperature- F 225 325 425 525 625 99.2 71.2 55.5 38.6 29.8 24.0 20.2 146 105 81.5 56.6 43.4 35.2 29.6 195 139 108 75.0 57.5 46.6 39.2 -- -- 136 94.0 72.0 58.3 49.0 -- -- 164 114 86.8 70.4 59.2 125 72.2 50.8 39.2 32.0 27.0 184 105 74.0 57.1 46.5 39.2 246 139 97.6 75.3 61.3 51.7 -- 174 122 93.7 76.2 64.3 -- 209 146 112 91.5 77.0 800 725 -- -- -- 133 102 82.6 69.5 -- 171 131 107 90.0 900 825 -- -- -- 154 118 95.3 80.1 -- 196 151 122 103 Use J-M Application Service for peak performance When you pay for top-quality insulation, back up your investment with the best installation service money can buy. Today, with high fuel and maintenance costs, it is especially important to place your insulation job in skilled hands. The scientific application of J-M quality insulations by J-M Insulation Contractors will assure you of the maximum return on your insulation investment for years to come. Moreover, you get un divided responsibility for all your insulation require ments. Johns-Manville has established J-M Insulation Techni cal Service Units and J-M Insulation Contract Units throughout the country to serve you--units staffed with men who understand insulation engineering and with skilled applicators who are thoroughly trained in proven Johns-Manville methods. Working with J-M materials and with J-M Insulation Engineers, these contractors know how to apply J-M insulation correctly to insure long, trouble-free per formance. You can have the utmost confidence in their ability to handle your insulation application from start to finish. And remember this important point: When your ar chitect or engineer specifies Johns-Manville insula tions any J-M Insulation Contractor in the country will be able to give you a quick, accurate bid, regard less of the size or location of the job. Johns-Manville General Headquarters 22 East 40th Street, New York 10, New York CANADIAN JOHNS-MANVILLE' COMPANT, 1TD. - ; ' MonWtninpnlip*sfeiUw'JintpanfoTiHorfof n;toj.,,t 1 tlkn in 1J & A MARINITE BAKING OVENS from a report presented by THOMAS R. LUGAR Vice President, Thomas L. Green & Company, Inc. Indianapolis, Indiana IND-3034 Annual Training Conference Biscuit Bakers Institute USI Johns-Manville THOMAS L. GREEN & COMPANY, INC. INDIANAPOLIS, IND. The following is an excerpt from a report'on "Ovens-Burners-Bands" presented by Mr. Thomas R. Lugar, Vice President, Thomas L. Green 8c Company, Inc., at an annual training conference of the Biseuit Bakers Institute,, "Having decided upon the size of oven required, and the amount of baked product required, the next most logical topic to investigate is oven construction and type of insulation used. This is very important to the oven builder, as well as the operator, as both are concerned with the cost of the unit, sturdiness of construction, and efficiency. "Basically, there are two types of insulation used, having taken for granted that the frames and supporting members of the oven body are made of suitable steels properly designed to support the various loads. These two types of insulation are Fiber Glass and Marinite. For purposes of illustration, I would like to refer to Figures 1 and 2. "Figure 1 illustrates a Thomas L. Green Steel Oven in which Fiber Glass is used as the insulating material. Fiber Glass is a multi purpose material for a wide range of industrial applications requiring a resilient, light weight, inorganic insulation for thermal control. This oven is insulated with this high temperature insu lation in a thickness o.f six inches, and is also equipped with re fractory above and below the band in the baking chamber for the purpose of producing a solid heat. Both out side walls of the oven are removable panel sections, assembled complete with both FIGURE 1 inner and outer sheets, burner port openings, and insulation assembled complete. These removable sections are held in place by clamping strips and are exact duplicates as to size and design. "Fiber Glass is an excellent insulating material, with an extremely low thermal conductivity factor. In this type of oven, however, whether it be ours or another manufacturer's, there still exists a large amount of 'through metal' which tends to increase heat losses to the extent that the benefits resulting from the lower conductivity factor of the insulation are, to a large degree, nullified. By 'through metal' I mean metal which extends from inner to outer wall, top or bottom surface, and which provides an easy path for heat to escape. 2 "Figure 2 illustrates a Thomas L. Green Marinite Oven. Since the term 'Marinite1 may be unfamiliar to some of you, I would like to explain a little about it, since it is now being used in many ovens of different manufacturers in the baking industry today. FIGURE 2 "Marinite is an insulating sheet material composed of asbestos fiber, diatomaceous silica, and an inorganic binder. Because it is both a struc tural and an insulating material, it offers major economic advantages in the construction of ovens requiring a housing for retention and control of heat. Marinite is one of the few insulations available that can be erected without the metal sheathing necessary when mineral-fiber type or similar insulating materials are employed. "Marinite combines great structural strength with light weight and excellent thermal properties. It is fireproof and has a low thermal ex pansion coefficient. Marinite is completely noncorroding, and can be used either in its natural state or by adding enamel, stainless or aluminum sheets to the exposed surface areas of the side walls and top panels of the oven. "Naturally, there are many published charts and specification sheets available on the properties of Marinite which I would be happy to send to any of you who are particularly interested in this type of data. Generally speaking, however, we have found this type of insulation in the construction of our ovens to provide a more uniform temperature control in the oven, considerably less maintenance, and greater ease in the erection of the entire unit. Especially in plants where a variety of different products is being baked, I believe we will see a much greater use of Marinite as an insulation. In addition, the requirements for greater flexibility of control will tend to reduce to a minimum the use of refractory material which tends to store heat, and will lead to a greater emphasis on convection as the mode of heat transmission in the baking chamber." In addition to the foregoing, Mr. Lugar furnished the following perform ance comparison between Marinite and insulated metal panels: Performance Comparison Marinite vs. Insulated Metal Panels Two gas-fired band ovens, for baking cookies, stand side by side. The same dough is fed to both, machinery merely being moved from one to the other. Marinite Oven Insulated Metal Panel Oven Oven Details: Insulation Thickness 3" Marinite-36 8-1/4" Mineral Felt Inside Dimensions Width of Band Same Inside Dimensions in Both Oven 38" 38" Effective Baking Width 36" 36" Length of Oven 100' 200' Product - Oatmeal Raisin Cookies: Baking Time 6 min. 9 min. Weight of Product Baked Fuel (Propane) Consumed 1285 lb/hr 12 gal/hr 1755 lb/hr 18 gal/hr Weight of Product Baked per Gallon of Fuel Consumed 107 lb/gal 97.5 lb/gal Quality Excellent Texture; Uniform Bake Hard Texture; Imoerfect Bake Advantages of Marinite Indicated by the Performance Comparison: 1. Economical in fuel usage. Almost 10$ more cookies were baked with the same amount of fuel. 2. Better than 33$ less baking time. 3. Shorter oven required, occupying less space. While the insulated sheet metal oven has a 37$ greater rate of production, it is 100% longer. For equal production rates, the Marinite oven would be almost one-third (32$) shorter or, conversely, the insulated sheet metal oven would be practically one-half (47$) longer. Thus the total cost of the Marinite oven would be lower even if it happened to cost up to 47$ more per linear foot. Conversely, the total cost of the insulated sheet metal oven would be higher unless it happene to cost at least 32$ less per linear foot. None of this takes into account the 9$ fuel savings of the Marinite oven and its more economical use of space. 4. Produces baked goods of superior quality. *** JOHNS-MANVILLE Greenwood Plaza Denver, Colorado 80217 Suite 1500 11 South LaSalle Street Chicago, Illinois 60603 (312) 750 9500 Telecopier: (312) 750-9520 FREEBORN & PETERS Attorneys at Law Suite 510, 950 South Cherry Street Denver, Colorado 80222 (303) 757-0933 Telecopier: (303) 756-0091 November 2, 1989 VIA FACSIMILE Thomas W. Tardy, III, Esq. THOMAS, PRICE, ALSTON, JONES & DAVIS 121 North State Street Post Office Drawer 1532 Jackson, Mississippi 39215-1532 RE: ASBESTOS-FREE MARINITE PRODUCTS Dear Mr. Tardy: In response to your October 31, 1989 letter to Helen Marsh, I am submitting the following information: Asbestos-containing Marinite 23, 36 and 65 were replaced by Marinite XL in 1976. Marinite XL was described in the product literature as an asbestos-free fireproof structural insulation that builds and insulates in one operation. Consisting of calcium silicate with inert fillers and reinforcing agents, it is suitable for temperature applications to 1200F and is used in construction of ovens, driers, bag-houses, marine panels, and other insulated housing for the retention and control of heat. In December 1978, Marinite XL was replaced by an improved asbestos-free Marinite designated as Marinite XLO. Marinite XLO was subsequently renamed and is now identified as Marinite I for industrial applications and Marinite M for marine service. The product description for Marinite I is essentially the same as Marinite XL above. The description of Marinite M states: Coast Guard and Maritime Administration approved for marine use, Marinite M is asbestos-free and formed from calcium silicate with inert fillers and reinforcing agents. It is designed to provide structural strength and high thermal and acoustical insulating values in a variety of interior marine applications. In 1980 Marinite C Fireproof Structural Insulation and Marinite P Structural Insulation Board and Pallet were introduced, both consisting of calcium silicate with inert fillers and reinforcing agents. Marinite C is used specifically for casting Thomas W. Tardy, III, Esq. November 2, 1989 Page 2 of non-ferrous molten metals up to approximately 1350F. Marinite P is used primarily for insulating platen presses or other applications requiring high compressive strength with a temperature limit of 1200F. I hope the above information will prove helpful. be of further assistance, please advise. If we can Sincerely, lb