Document dDqa63Vp4b0XYayVK1ReL8oa5

i MoftheR f. Afln Manager THE MAGNESIA INSULATION MANUFACTURERS ASSOCIATION I WASHINGTON 4, 0. C. 1317 F N.W. EXfr^ke 3*3008 PLAINTIFFS EXHIBIT 7 September 1955 WV-05907 MIKA 55-34 To: MIMA Technical Committee Members Attention: Mr. fftley W* Smith Subject: HH-M-61a Insulation: * Thermal, Magnesia Block, Pipe and Cement, Proposed Revision of Federal Specification. Enclosure: {1} Copy of Subject Proposal dated 1 Kay 1955. Dear Mr. Smiths . In the course of our follow-up with the Bureau of Federal Supply, it was learned that our original draft proposal together with certain changes has been coordinated with same of the member# of the Federal Task Group. However, in discussing the details of the draft with one of the membere, it was learned that all of the recoamended changes which we submitted by letter in Kay of this year were sot Included in the particular copy. . * <t After discussing the matter with Mr. Thomason, we agreed to furnish a sufficient nusbeF of copies of the com pletely revised .draft to ensure that consideratin:, is given to all of our recemendations* ' One of the major changes in the enclosed draft is contained in Paragraph 2, wherein applicable A3TM Specifica tions have' bees substituted' for Ccwsasrcial Standard C313X-49. As you will recall we objected to CS13W6 because of Its identity with industrial mineral wool requirements* The only point last may affect this change is that the "Federal Outline of Form for Specifications" states that most governmental and nongovernmental specifications other than federal specif1ca tions should not be referenced in federal product specifications. Quoting frcm the Outline the "reasons for limiting the use of both governmental, other than federal specificationa and non governmental specifications and publications are as follows: t flC 4224 96 hi $*33 i WV-05907 -2- Such acements are not controlled by, and are subject to change without reference to, the Federal Specificationa Board. Difficulty ie frequently encountered in securing copies of such documents to furnish bidders and inspectors* Many nongovernmental specifications contain contraeturel features relative to claims and settle ment of claims that may conflict with Inspection, administrative, or legal procedures of the federal government*" If our proposed Federal Specification for methods of testing, which we will shortly submit for your considera tion, is adopted it will overcome the above objection* Very truly yours, MFAiJR eno* Manager MC 422496 $ NOTE: This draft, dated 31 May 1955, prepared by the Technical Committee of The Magnesia Insulation Manufacturers Association, has not been approved by the Bureau of Federal Supply and is subject to modification. DO NOT USE FOR PROCURE MENT PURPOSES. 1953 SUPERSEDING HH-M-61a Amendment-2 4 December 1947 FEDERAL SPECIFICATION FOR INSULATION; THERMAL, MAGNESIA, BLOCK, PIPS AND CEMENT 1. SCOPE AND CLASSIFICATION 1.1 Scope,- This specification covers requirements for magnesia block, pipe and cement thermal insulation, which shall be satisfactory for use on surfaces at temperatures up to 600F. 1.2 Classification.- Mapiesia thermal insulation covered by this specification shall bo furnished in one grade only, and in the following types and classes, as specified. Type I - Block Class 1 - Flat Block. Class 2 - Curved Block. Type II - Pipe Type III - Cement 2. APPLICABIS DOCUMENTS 2.1 The following specifications, of the issue in effect on -2- date of invitation for bids, form a part of this specification* SPECIFICATIONS ASTM SPECIFICATIONS ASTM-Cl65 - Compressive Strength of preformed block type thermal insulation, standard method of test for. A3TM-C177 - Thermal conductivity of materials by means of the guarded hot plate, standard method of test for. ASTM-C302 - Density of preformed pipe covering - type thermal insulation, tentative method of test? for. ASTM-C303 - Density of preformed block type thermal insu lation, tentative method of test for. A3TM-C 335 - Thermal conductivity of pipe insulation, ten tative method of test for. (Copies of ASTM Specifications may be purchased from the American Soeiety for Testing Materials, 1916 Race Street, Philadelphia 5, Pennsylvania.) 3. REQUIREMENTS 3.1 Material.- The Magnesia thermal insulation materials covered by this specification shall be composed of heat resisting compounds suitable for the temperature conditions and the purpose intended* 3.2 Chemical Requirements*- The thermal insulation materials covered by this specification shall contain not less than 85 per cent of hydrated macesium carbonate UMgCOgM^OEOg-SHgO) rein- tlC 4224 96 h **34 - 5- forced with mineral fiber. She mixture of the magnesia and the mineral fiber shall be homogeneous throughout. 3.3 Physical Requirements.- The magnesia bloek and pipe thermal insulation furnished under this specification shall conform to the respective physical requirements prescribed in Table I. Table X - Physical Requirements Cha ra c ter i sties Method of Test,- Paragraph Retruiraments Density,Average,lbs./cu.ft., Maximum 4.5.3 14.0 Thermal Conductivity,Average, 4.5.4 B.t.u. in./hr./sq.ft./*F.maximum at mean temperatures of: 200 F.- - - - -......................... - 300 S\--------- --------------- ---- ------------400 P..................... -................................. 0.45 0.50 0.53 (2) Flexural Strength,Average,lbs./sq.in. ,Min (2) Compressive Strength,Average,lbs./sq.in., at 10% Reduction in 'thickness,&in. 4.5.5 4.5.6 (1) 50.0 Linear Shrinkage,Average,Percent,Max. 4.5.7 2.0 (IT Three times dens'!y (lbs. per cu. ft.) of Sample tested. " (2) If flexural strength or compressive strength values are re quired for magnesia pipe thermal insulation, approximate values may be secured by testing block frora the same produc tion run as the pipe insulation. NC 422496 w ym35 -4- 3,4 Form and 3men*lona.- 3.4.1 Type X - Slocks.- 3.4.1.1 Type I - Clasa I.- Flat blocks shall be furnished in rectangular pieces, not less than 6 inches wide, 18 inches or 56 inches long, and 1, 1-1/2, 2, 2-1/2 and 3 inches thick, as specified. 3.4.1.2 Type I - Clasa 2.- Curved blocks shall be furnished curved to inside radii of over 16j inches, not less than 6 in ches wide, 36 inches long and 1-1/2, 2, 2-1/2 and 3 inches thick, as specified. 3.4.2 Type IX - Pipe insulation shall be supplied a a seal- cylindrical sections, or as curved segments 36 inches long to properly fit standard pipe sizes. The thicknesses of Type II pipe insulation furnished for the various sizes of pipe shall be as shown in Table II. Table II, (a) Insulation Thickness - Copper Tubing Copper Tubing Size Nominal inches 0. D inches .3/8 1/2 . 3/4 1 1-1/4 1-1/2 2 2-1/2 3 .500 .625 .875 1.125 1.375 1.625 2.125 2.625 3.125 Nominal 1 inch thick Actual Thickness incha 7/8, 1-3/32 1 7/8 1-1/16 15/16 15/16 15/16 15/16 | HC 422496 fi 00 -5Tc.ble 11, (b) Insulation Thickness - Iron Pipe (Table II, (b), same as MIL-I-2781B) NOTE: a; On 7, 9til and IS inch pipe-slaes 3 inch thick pips insulation ro&y be furnished by the supplier in lieu of the 2-1/2 inch thick pipe insulation specified. -6- 3.4.2.1 - Pip insulation for sizes up to and including 10 inches shall be furnished in sections- Pipe insulation for sizes larger than 10 inches shall be furnished in curved segaents or sections. 3.4-2.2 - Pipe insulation may be furnished in two layers to form total required thickness. Sections may be furnished for all sizes. Where two layers are furnished, the inner layer for size a larger than 12, inches and the outer layer for sizes lar ger than 10 inches may be furnished in curved segments. 3.4.2.3 - Sectional pipe insulation for nominal pipe sizes of 10 Inches and under shall be furnished with a cotton sheeting jacket covering the entire length of the insulation. The jacket shall have a 1 inch, minimum, lap on one end. 3.4.2.4 - When specified in the invitation for bids, metal bands shall be furnished, five for every two sections of pipe insulation. 3.4.3 Tolerance.- k tolerance of 1/6 inch in length, width and thickness will be permitted. 3.4.4 Type III - Cement.- Magnesia insulating cement shall be furnished in a dry finely divided form which when mixed with water to proper troweling consistency shall fom a ligfct, in combustible thermal insulation suitable for application to pipe fittings, valves and other surfaces. 3. Workmanship.- The workmanship shall be first class in every respect. -7 - 4. SAMPLING, INSPECTION AND 1EST PROCEDURES 4.1 Inspection Procedures*- The thermal Insulation mater ials covered by this specification shall be Inspected in accord ance with the procedures specified in 4.4. 4.2 Test Procedures.- She physical requirements specified in Table I and the chemical requirements specified in paragraph 3.2 shall be determined in accordance with the tests specified in 4.5. 4*3 Sampling for Lot Acceptance. 4.3.1 Inspection Lot.- All blocks and half-sections and seg ments of pipe insulation and.magnesia cement presented at one time shall be considered a lot for purposes of acceptance, in spection, and tests. 4. 3.2 Sampling for Inspection and Lot Acceptance Teats. 4.3.2.1 . Types X and IX - Block and Pipe.- A random sample . of full-sizqd blocks and half-sections and segnents of pipe Insulation aha11 be selected and shall be representative of the inspection lot from which the samples are taken. VJhen a lot contains material of. more than one size, a representative selec tion of sizes and thicknesses shall be included among the samples. Table III gives the number of samples which shall be selected from each inspection lot. * MC 422496 A -8- Table III - Sampling for Inspection and Lot Acceptance Number of blocks, half sections or segments in inspec tion tot 40 or Under 41 to 110 111 to 500 501 to 1300 1301 and Over Number cf blocks, half sections or segments in sample 2 3 5 7 10 4.3.2.2 Type 111 - Cement.- Ftroa each inspection lot of Magnesia Cement, samples shall be taken at random, The amount shall very with the size of the inspection lot and sufficient shall be taken to thoroughly represent the material presented for inspection and test. At least 25 prams shall be taken frcta each inspection lot. 4.4 Inspection. 4.4.1 Types I and 11 - Slock and Pipe.- Several lengths of pipe half-sections, segments or blocks taken, from the sample shall be visually and dimensionally inspected and the density determined (see Far. 4.5.3) to verify compliance with this specification. 4.4.2 Type III - Cement.- A sample of the material which has been molded in a form and dried shall be subjected to a soaking heat of 600 F without baking hard, burning, or producing a flame. MC 422496 h ym4 ~9- 4, 5 Teat Procedures. 4.5.1 Conditioning Samples.- Tfest specimens fop inspection and lot acceptance tests shall be dried to constant weight by heating to 215 to 260 F before testing. 4.5.2 Chemical Analysis.- The, composition shall be determined by chemical analysis, in accordance with the following methods 4.5.2.1 Preparation of Sample.- Prepare a sample by taking at least ten small fragaents from each lot. Trim each frag ment to a smooth surface, leaving no fibers projecting from any / surface. Thoroughly crush the frafronts and, if necessary, quarter them down to a 25 srant sample. Store the sample in a rubber-stoppered glass bottle.. 4.5.2.2 Hygroscopic Moisture.- Place 2 grams of the sample on a weighed watch glass and dry to constant weight at 100C. Record the loss in weight as hygroscopic moisture. 4.5.2.3 Fiber.- Add 100 milliliters of Tester and 2 drops of methyl orange to 5 g?ams of the sample, then slowly add, with stirring, 1 N HC1 until a persistent pink color appears. {This will require about 125 milliliters.) Wash thoroughly with cold water and collect the asbestos by filtering through a weired Gooch crucible.1 Dry the crucible and its contents at 110 C, and welgi. (The weight of fiber so obtained may be corrected by a blank determination on the asbestos used in the product.) 4.5.2.4 Filtrate.- Make up the combined filtrate and wash- tlC 422496 ft &04 i i - 3.0 - ings, obtained a a prescribed in paragraph 4.5.2,3, to 1 liter in a standardized flask. One hundred milliliters of this solution are used for further analysis. 4.5.2.5 Iron and Alumina*- Dilute a 100-milliliter portion of the solution desoribed in paragraph 4.5.2.4 to 200 milli liters, add 10 milliliters of HC1 (specific gravity 1.19} and heat the solution to boiling temperature. Slowly add dilute NH^OH to slight excess, and then boil the solution for a min ute or two to coagulate the precipitate and to expel the excess ansnonia. Filter off the precipitate,, which consists of the hydroxides of aluminum and iron, wash with hot water, and, if desired, ignite and weight as FegOj J* AI2O3, 4.5.2.6 Dime. - Kbat to boiling temperature the combined fil trate and washings obtained as prescribed in para^aph 4.5.2,5, . and make sligitly acid with HC1. Add about 10 milliliters of a saturated solution of aasnoniura oxalate, and make- the solution sli^itly alkaline with KH^CK. .After boiling for 5-minutea, al low the solution, to cool, and, when thoroughly cold, decant the bulk of the solution through a filter and wash the precipitate in the beaker two or three times by decantation with cold water, using abput 50 milliliters of water each time.,. Dissolve the precipitate on the filter in dilute BG1 and return to the beaker In which the precipitation was made. Add sufficient BC1 to redissolve the entire precipitate, heat the solution to boil- MC 422496 * *564 11 - ing, add a Tew milliliters of arononium oxalate solution, and then add dilute Hk40H in alight excess. Vvhen ooldj collect the precipitate of calcium oxalate on a filter, wash with cold water and, if desired, ignite and rreigh as CaO. It is especially im portant that the double precipitation of lime be carried out in order that the occlusion of magnesia with the lime shall be avoided. 4.5.2.7 Magnesia*- Acidify the combined filtrates, but not the washings, from the last lime precipitation with HC1, and . evaporate on a hot plate to about 500 milliliters. Add a.suf ficient quantity of a saturated solution of sodium ammonium phosphate to precipitate all of the magnesia, an a considerable excess of ammonia. Ihoroughly stir the solution until precipi tation is complete, and allow to stand at least 12 hours in the cold. Decant the bulk of the liquid through the. filter, wash the precipitate on the filter back into the beaker, and dissolve in the least possible amount of dilute HC1. Add a few drops of phosphate solution and then ammonia in slight excess, with stir ring, as before. After standing at least 6 hours, filter,off the precipitate and wash with dilute ammonia (ItlO). Dry, de tach the precipitate frees the paper, and burn the paper on a platinum wire above the crucible containing the bulk of the , precipitate, adding the ash to the contents of the crucible. Heat the covered crucible, gently at first, and then, when ammonia is no longer evolved, increase the heating to a full HC 422496 w 004 3 - 12 - blast until constant weight is obtained. The residue is mag nesium pyrophosphate (Mg2Ps07). The following formula may bo used to determine the wei$tt of the basic magnesium carbonate: Mg2Pg07 X 0.8783 4MgC03Mg(OH)2'5K20 (In place of 0.8723, the fraction ^.349 be used.) 6.4" 4.5.2.8 boss of Xmitton.- Place about 2 grams of the sam ple in a weighed covered crucible, and heat slowly to redness and then at the full temperature of the blast for 15 minutes. After weighing, blast for $ minutes more to insure constant weigit, The loss in weight includes water and OOg from the magnesium carbonate and loss due to heating the asbestos. 4.5.2.9 Carbon Dioxide.- Place about 1 gram of the sample in a weighed Schroedter alkalineter. Allow dilute HC1 (1*1) to run in on the sample and, when the main reaction is over, boil the solution gently for 2 minutes. V.hen cold, draw air through to displace the COg, and weigh the apparatus. The loss in weight is C02. This method is subject to errors of pre cision of as much as 0.5 per cent. 4.5.3 Density. 4.5.3.1 Tvne I - Block.- The density of Type X, block insu lation shall be determined in accordance with the method speci fied in ASTM Specification C303. 4.5.3.2 Type IX - Pipe.- The density of Type XI, pipe insu lation shall be determined in accordance with the method speei- HC 4224*6 hi 0044 - 13 - fled in ASOW Specification C202. 4.5*4 Conductivity. 4.5.4.1 Type I - Block.- She thermal conductivity of Type I, block insulation shall be determined in accordance with the method specified in AS1*1 Specification CX77. 4.5.4.2 Type II - Pine.- The thermal conductivity of Type II, pipe insulation shall be determined in accordance with the method specified in ASTit Specification C33S. 4.5.5 Flexural Strength. 4.5.5.1 Type I - Block.- The flexural strength of Type I, block insulation shall be determined in accordance with the fol lowing method: 4.5.5.1.1 Apparatus.- The apparatus shall consist of any form of standard testing machine capable of applying and meas uring the required load with an accuracy of plus or minus 2 per cent. The cylindrical bearing edges shall be 1-1/4 * 1/4 inches in diameter and shall be straight and self-aligning so a's to maintain full contact with the specimen throughout the test. They shall have a length at least equal to the width of the specimen'. 4.5;5.1.52 Test Specimens.- The teat specimens shall be pre ferable 5 inches but not less than 3 inches in width and shall be approximately 12 inches in length. If. the teat specimen is cut to obtain a narrower width than ao-roceived, the cut shall be MC 422496 H 0*1? 4 5 - 14 - sade lengthwise of the block- the spec linons shall be cut from larger blocks or irregular shapes in such a manner as to preserve as many of the original surfaces as possible* Only one specimen shall be cut from a single block or shape* 2fce bear ing faces of the test specimen shall bo approximately parallel planes* (i.hen the original surfaces of the block are substan tially plana and parallel, no special preparation of the sur faces will visually be necessary. In preparing specimens from pieces of irregular shape, any means such a band saw, or any method involving the use of abrasives such as a high-speed ab rasion wheel or a rubbing bed, that will produce a specimen with approximately plana and parallel faces without weakening the structure of the specimen may be used. 4*5*5.1*3 Test Procedure* 4.5.5.1.5.1 At least four specimens shall be tested. The test specimens shall be dried in a ye.nfced oven for not less than 16 hours at 215 to 250 P. 4.5.5* 1.5.2 The bearing edges shall be placed so as to pro vide a span of 10 inches* A test specimen shall be placed flat wise on the bearing edges and the load applied at mid-span, ac ross the width and perpendicular to the top face ot the specimen, 4.5.5.1*3.3 The speed of the moving head of the testing machine, during the application of the load, 9hall be not more than 0.5 inches per minute, or the rate of loading shall be not tIC 422496 R *J046 - 15 - more than S00 pounds per minute* ' 4,5.5.1;3,4 The load shall he applied until definite failure occurs, and the maximum lead in pounds as indicated by the test ing equipment shall be recorded. The average value of the flex ural strength shall be reported in pounds per square inch. 4,5.5.1.4 Calculation.- The flexural strength shall be cal culated as follows.* wherex R SWl. SES2 K 2 Flexural strength in pounds per square inch, V s Load in pounds at which the specimen failed, 1 Distance between the supports in inches, b * Width of the specimen in inches, and d Thickness of the specimen in indies 4.5.5.2 Type IX - Pipe.- If the flexural strength of Type II, pipe insulation is required, approximate values may be secured by testing block, from the same production run as the pipe in sulation furnished under this specification. The method of test ing block is specified in paragraph 4.5.5.1. 4,5.6 Corneresalvo Strength. 4.5.6.1 Trt>e I - Block.- The compressive strength of Type I, block insulation shall be determined in accordance with the method specified in.A5TM-Specification C165. 4.5.6.2 Type II - Pipe.- If the compressive strength of Type II, pipe insulation is required, approximate values may be MC 422496 ft 004? - 16 - secured by testing block from the same production run and the pipe insulation furnished under this specification. 'The method of testing block is specified in paragraph 4.5.6.1. 4,5.7 Linear Shrinksge.- The linear shrinkage of the sample, after soaking heat shall be determined by placing carefully sized specimens {minimum size 5x2x1 inches) in an electrical ly heated oven. 'Six* specimens shall be heated at the manufac turer's recommended temperature limit plus or minus 10 F for 24 hours. After removal from the oven, the specimens shall be ex amined to determine linear shrinkage. 4,6 Rejected Lota.- If the sample lot fails to conform to the requirements of this specification, a second sample from the same lot shall be examined and tested. The results of the re test shall bo averaged with the results of the original test to determine compliance with this specification. Rejected lota may be offered again for Goverrmeht inspection provided the con tractor has repaired or removed all non-conforming aamples. Samples shall again be selected and examined to verify compliance with this specification. 5. PREPARATION FOR DELIVER* 5.1 -Packaging,- Unless otherwise specified, commercial pack ages are acceptable under this specification, 5.2 Packing.- Unless otherwise specified, the subject com modity shall be packed in substantial comercial containers of the type, size, and kind commonly used for the purpose, eo con NC 4.224 9* R 0049 17 - s trueted as to insure acceptance and safe delivery by correnon or other carriers, at the lowest rate, to the point of delivery called for in the contract or purchase order, 5,6 Markins.- Unless otherwise specified, shipping contain ers shall be narked with the name of the material, the, size, the type, and the quantity contained therein, as defined by the con tract or order under which the shipment is made, the name, of the contractor and the mother of the contract or order. 6, DEPARTMENTAL REQUIREMENTS 6.1 The following departmental specifications of the issue in effect on date of invitation for bids, and special requirements shall form a part of this specification, and shall be applicable to purchases made under this specification by the respective de partments. 6.8 Army.- The U. 5. Army Specification No. 100-2, Standard Specification for Marking Shipment. Copies of this specifica tion may be obtained without cost upon application to the agency issuing the proposal for bids. 6.3 Navy.- rtC 422496 h 004 9 18 - 6.3.1 Applicable specifleations and other publications FEDERAL SPECIFICATIONS NN-B-591--Boxe a 5 Jood-Cleated-Fiberboard. NN-3-601--Boxes; Wood-Cleated-Plywood (Tor Domestic Shipments)* M-B-621--Boxes; Wood, Nailed and Lock Corner. NN-B-631--Boxes; Wood, Wire-Bound, (tor Domestic Shipment*) m~S-48--Sacks; Paper, Shipping* LLL-B-631--Boxes; Fiber, Corrugated (for Domestic Shipment*) MILITARY JAN-P-10S--Packaging and Packing for Overseas Shipment--Boxes, Wood, Cleated, Plywood JAN-P-106--Packaging and Packing for Overseas Shipment. 6.3.2 Packing. 6.3.2.1 For. Domestic Shipment. 6.3.2.1.1 Pipe and Block Insulation.- Pipe and block insula tion shall be packed in substantial commercial containers of the type, size, and kind commonly used for the purpose, so construc ted as to insure acceptance and safe delivery by common or other carriers, at the lowest rate, to the point of delivery. When MC 422496 A *j A 5 # 19 - wood-cleftted fiberboard boxes, wood-cleeted plywood boxes, nailed wood boxes, wire-bound wood boxes, corrugated fiber boxes, or solid fiber boxes are used, they^shall confora to the require ments of Federal Specifications NN-B-S91, NN-B-601, HN-B-621, M-B-631, BLL-B-631, and LDL-B-636, respectively* The gross weight of wood boxes shall not exceed approximately 200 pounds? of flberboard boxes, 70 pounds. 6.3.2.1.2 Cement.- Dry cement shall be packed in multi-wall paper sacks conforming to the requirements of Federal Specifi cation OU-S-48. 5.3.2.2 For Overseas Shipment.6.3.2.2.1 Pipe and Block Insulation.- Pipe and Block Insula tion shall bo packed in cleated-plywood boxes, nailed wood boxes, wire-bound wood boxes, fiberbo&rd boxes, or fiberboard-lined wood boxes conforming to the requirements of Joint Army-N&vy Speci fications JAN-P-10S, JAN-P-106, JAN-P-107, JAN-P-108, and JAN-P-138, respectively. Shipping containers shall be lined with a sealed waterproof bag, or its equivalent, made frees material conforming to the requirements of Joint Army-Navy specification JAN-P-125. Ihe seams and closures shall be sealed with waterresistant adhesive conforming to the requirements of Joint ArmyNavy Specification JAN-P-140. 3he gross weight of wood boxes shall not exceed approximately 200 pounds; of fiberboard boxes, 70 pounds. 6.3.2.2.2 Cement.- Dry cement shall be packed in multi-wall MC 422496 h G & 51 - 20 - papa? sacks conforming to the requirements of Joint Army-tfavy Specification JAN-V-116 barrels conforming to She requirement* of Joint Army-Navy Specification JAft-P-222* S.3.5 Marking- In addition to any special marking required by the contract or order, marking of interior packages and ship ping containers shall be in accordance with the requirements of the Navy Shipment Marking Handbook, 6.3.4 Ordering Inforaafcion*- Bequests, requisitions, sched ules, and contracts or orders should specify whether the sub ject commodity is to be packed and shipping containers marked tor domestic or overseas shipment. 6.3.5 Purchases. 6.3.5.1 For other than the Bureau of Aeronautics - For ad ministrative reasons, such purchases will be made under the is sues in effect, on date of invitation for bids of the following Havy Department Specifications. 6.3.5.2 For Bureau of Aeronautics - Such purchases will be made under this Federal Specification. 7.. NOTES 7.1 Purchasers should exercise any desired options offered herein, and should specify the type and thickness of the block and pipe insulation required. If metal bands are required they should be specified in the invitation for bids. (See Par. 1.2, 3.4.1.1, 3.4.1.2, 3.4.2, 3.4.2.4). 11C 422496 H 0052 21 7.1*1 If a cotton sheeting jacket for sectional insulation for nominal pipe sizes larger than 10 inches is required, it should be so stated in the invitation for bids. 7.2 This material is intended for insulation where the tem perature does not exceed 000 F. 7.3 It is believed that this specification adequately de scribes the characteristics necessary to secure the desired material and that normally no samples will be necessary prior to award to determine compliance vd.th this specification. If, for any particular purpose, samples with bids are necessary, they should be specifically asked for in the invitation for bids, and the particular purpose to be served by the bid sample should be definitely stated, the specification to apply in all other res pects. 7.4 Federal specifications do not include all types, classes, grades, etc*, of the commodities indicated by the titles of the specifications, or which are ccornierdaily available but are in tended to cover the types, etc., which are suitable for Federal Government requirements. 7.5 An true* of Federal Specifications may be purchased as noted in paragraph below, price to be obtained from Che Superin tendent of Documents, Government Printing Office, Washington 25, D. C. Price 5 cents. ' Notice,- When Government drawings, specifications or other MC 422496 A *53 22 - l \ dafcft are used for any purpose other than In connection with a definitely related Government procurement operation, the TTnited States Government thereby incurs no responsibility nor any ob ligation whatsoever; and the fact that the Government may have formulated, furnished, or in any supplied the said drawings, specifications, or other data, is not to be regarded by the im plication or otherwise as in any manner licensing the holder or any other person or corporation, or conveying any rights or per mission to manufacture, use, or sell any patented invention that may in any way be related thereto. t )4 ' i* MC 422496 f) '054