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Properties of Plastic Films for Use As Waterproofing Materials in Underground Heat Distribution Systems

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Properties of Plastic Films for Use As Waterproofing Materials in Underground Heat Distribution Systems c/ — °\'A ' %/ T~&~ * §f ur NATIONAL BUREAU OF STANDARDS REPORT 5967 Report on Project 4881 Properties of Plastic Films for Use as Waterproofing Materials in Underground Heat Distribution Systems by A. G. Roberts for Office of the Chief of Engineers bureau of Yards and Docks Headquarters U.S. Air Force U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS THE NATIONAL BUREAU OF STANDARDS Functions and Activities The functions of the National Bureau of Standards are set forth in the Act of Congress, March 3, 1901, as amended by Congress in Public Law 619, 1950. These include the development and maintenance of the national standards of measurement and the provision of means and methods for making measurements consistent with these standards; the determination of physical constants and properties of materials; the development of methods and instruments for testing materials, devices, and structures; advisory services to Government Agencies on scientific and technical problems; invention and development of devices to serve special needs of the Government; and the development of standard practices, codes, and specifications. The work includes basic and applied research, development, engineering, instrumentation, testing, evaluation, calibration services, and various consultation and information services. A major portion of the Bureau’s work is performed for other Government Agencies, particularly the Department of Defense and the Atomic Energy Commission. The scope of activities is suggested by the listing of divisions and sections on the inside of the front cover. Reports and Publications The results of the Bureau’s work take the form of either actual equipment and devices or published papers and reports. Reports are issued to the sponsoring agency of a particular project or program. Published papers appear either in the Bureau’s own series of publications or in the journals of professional and scientific societies. The Bureau itself publishes three monthly peri- odicals, available from the Government Printing Office: The Journal of Research, which presents complete papers reporting technical investigations; the Technical News Bulletin, which presents summary and preliminary reports on work in progress; and Basic Radio Propagation Predictions, which provides data for determining the best frequencies to use for radio communications throughout the world. There are also five series of nonperiodical publications: The Applied Matiiom Series, Circulars, Handbooks, Building Materials and Structures Reports, am! > .ancon Publications. Information on the Bureau’s publications can be found in NBS Circular 460. Publications of the National Bureau of Standards ($1.25) and its Supplement ($0.75), available from the Superin- tendent of Documents, Government Printing Office. Inquiries regarding the Bureau’s reports and publications should be addressed to the Office of Scientific Publications, National Bureau of Standards, Washington 25, D. C. NATIONAL BUREAU OF STANDARDS REPORT MBS PROJECT MBS REPORT 1003-12-4881 July 11 , 1958 5967 Properties of Plastic Films for Use as Waterproofing Materials in Underground Heat Distribution Systems by A. G. Roberts Plastics Section Organic and Fibrous Materials Division IMPORTANT NOTICE NATIONAL BUREAU OF ST progress accounting documents Intended fur use within the formally published It Is subjected Approved for public release by the He additional evaluation and i g, reproduction, or open-literature Director of the National listing of this Report, either Institute of tssion Is obtained in writing from She Oltke of the Director, Nr Standards and Technology (NIST) Such permission is not needed, however, by the Government prepared If that agency wlshee on October 9, 2015. y to reproduce additional copit U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS Properties of Plastic Films for Use as Waterproofing Materials in Underground Heat Distribution Systems by A. G. Roberts INTRODUCTION A difficult problem in the engineering of underground heat distribution systems is the long-term sealing of the system against external water and moisture that can impair or destroy the heat barrier property of the insulation. Water can also cause serious corrosion to the heat carrying pipe, or to the outer metal shell often used in such systems. In a typical heat* distribution system conforming to present recommended^) good engineering practice, the heat carrying pipe is surrounded by an adequate thickness of thermal insulating material held in place by a non-water tight wrapping which permits diffusion of water vapor from the insulation to a surrounding air space enclosed by a masonry or metal outer shell. Waterproofing of the outer shell against earth has generally been best accomplished by use of coal tar bitumastic materials. While these materials are excellent waterproofers as long as they remain in place, difficulties arise from their tendency to flow at elevated temperatures, such as might occur in the event of a heat pipe break or if seepage of external moisture reduced the insulating value of the insulation. Also, the adhesion of the bitumen (or other material) is sometimes poor because of the difficulty of obtaining in the field the cleanliness of surface required for good adhesion. The use of tapes or sheet wrappings of pressure sensitive polyvinyl chloride or polyethylene sheeting materials has 1 been considered an adequate alternative' ' to the use of the bituminous or other coating materials. Here also, trouble has been encountered because of the limitations of these plastic sheet materials at the elevated temperatures often met with in service and because of adhesion and bonding problems in the field. The rapid technical advances that have characterized the plastics field raise the possibility that new plastic sheet materials may be developed, or may already be available, having improved properties making them more suitable for use as exterior waterproof membranes in heat distribution systems. *Numbers in parentheses refer to the Bibliography at the end of this report. 2 To determine the present status of plastic film or_ sheet materials in relation to the waterproofing requirements of modern underground heat distribution systems, an extensive survey was made of the available literature and technical information on the physical and chemical properties of plastics. The results of this study are summarized in this report. Asphalts, coal tar pitches, and impregnated felts, although good waterproof ers within certain temperature limits, were outside the scope of the present survey on plastic films. Adhesives are considered only to the extent that they constitute essential adjuncts to the use of plastic film. Pressure-sensitive tapes, since they consist of a film plus adhesive, also are treated as secondary to the basic problem of developing a suitable film material. Concise descriptions are given of the test methods generally employed in evaluating the properties of plastic films. Application techniques for plastic film materials are discussed. An extensive, selected bibliography is given. Chief emphasis has been placed, however, on the most important properties of the plastic materials themselves. Indications are that among the new materials that have or will soon become available, there are several which give excellent promise of fulfilling, at reasonable cost, the rigorous requirements of application in underground heat distribution systems. PROPERTIES OF FILM MATERIALS The film properties considered to be of greatest importance for the intended application in underground heat distribution systems are as follows: WATER RESISTANCE Water vapor permeability Water absorption TEMPERATURE RESISTANCE Flow temperature or melting point Maximum service temperature (220°F required) Minimum service temperature ( 0°F required) Heat seal temperature - 3 - RESISTANCE TO SOIL CONDITIONS Acids, bases, and salts Fungi and bacteria Rodents and insects NATURAL WEATHERING RESISTANCE Resistance to oxygen and ultraviolet radiation STRENGTH Tensile strength Elongation Bursting strength Folding endurance TOUGHNESS Abrasion resistance Puncture resistance Tearing strength ELECTRICAL RESISTIVITY Volume resistivity SPECIFIC GRAVITY or DENSITY COST In considering the above properties in relation to available plastics, it was possible immediately to eliminate a large number of materials as unsatisfactory, so that attention could be concentrated only on potentially suitable materials. Thus, thermosetting plastics in general were' ruled out because of their rigidity and non-availability in film form. Elastomeric materials were not considered because rubber-like stretch is not an advantageous property in the present application. Among thermoplastic materials, the cellulose derivatives were eliminated either because of poor moisture resistance, poor fungal resistance, or poor resistance to elevated temperatures. Vinyl chloride-acetate copolymers are unsuitable because they soften at relatively low temperatures. Polyvinyl alcohol is soluble in water. Rubber hydrochloride film (Pliofilm) has a rather high water absorption and softens at moderately elevated temperatures. After due consideration, the following types of plastics were selected as worthy of detailed study for purposes of their possible usefulness in underground heat distribution systems. Those marked with an asterisk (*) are new and highly promising materials: ) - 4 - Polyester (Mylar) Polyethylene (conventional type) *Polye thylene (high-density type) *Polypropylene ^Polycarbonate
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