Plastic roofing material

In the mid-to-late 1980s, growth estimates of the use of polystyrene and polyurethane ceUular plastic insulation materials and products were a healthy 10% per year and greater for phenoHc (40,41). The principal appHcation where strongest growth was forecast for these types was for roofing, especially single-membrane systems (42). 

Extruded Rigid Foa.m. In addition to low temperature thermal insulation, foamed PSs are used for insulation against ambient temperatures in the form of perimeter insulation and insulation under floors and in walls and roofs. The upside-down roof system has been patented (256), in which foamed plastic such as Styrofoam (Dow) plastic foam is appHed above the tar-paper vapor seal, thereby protecting the tar paper from extreme thermal stresses that cause cracking. The foam is covered with gravel or some other wear-resistant topping (see Roofing materials). 

The maximum heat radiation that people are exposed to from a flarestack should not exceed 4.7 kW/m (1,500 Btu/ft /hr), about three times the peak solar radiation in the tropics. Even this amount of radiation can be withstood without injury for only a minute or two. The maximum to which people may be exposed continuously is about 1.7 kW/m (500 Btu/ft-/hr). In the neighborhood of flarestacks (say, wherever the radiation could exceed 1.7 kW/m ), the temperatures reached by cables, roofing materials, and plastic equipment should all be reviewed to make sure they cannot be damaged [8, 9]. 

A great variety of PVC materials have been tested in the process thus far cable, cable trays, flooring material, window frames, artificial leather, packaging, pipes, flexible hoses, ring binders and roofing material. This indicates that the process is robust and can handle a broad range of PVC materials. In terms of chlorine content, there are no restrictions. With the completion of the pretreatment pilot plant, the contents of other plastics and metals may now be reduced significantly. 

Tin finds widespread use because of its resistance to corrosion, or as foil or to provide protective coats/plates for other metals. Properties of lead which make industrial application attractive surround its soft, plastic nature permitting it to be rolled into sheets or extruded through dies. In the finely-divided state lead powder is pyrophoric in bulk form the rapidly-formed protective oxide layer inhibits further reaction. It dissolves slowly in mineral acids. Industrial uses include roofing material, piping, and vessel linings, e.g. for acid storage. 

Plastic Foam Materials and Roofing Insulation, 1983-1989, Peter Sherwood Associates, Inc., White Plains, N.Y., Apr. 1984 Roofing/Siding/Insul. 61, 82 (Oct. 1984). 

About 36 percent of all titanium dioxide used in the United States goes into paper and plastic materials. Titanium dioxide gives body to paper and makes it opaque (unable to see through it). Other uses are in floor coverings, fabrics and textiles, ceramics, ink, roofing materials, and catalysts in industrial operations. A catalyst is a substance used to speed up a chemical reaction without undergoing any change itself... 

Teflon is used as thermal insulation in clothing, as a component in wall coverings, and as a protective coating on metals, glass, and plastics. Teflon s properties of very low chemical reactivity and very low friction make it valuable in the construction of artificial joints for human limbs. As you can see in Figure 9, Teflon is also used as a roofing material. 

The current market requires a roof which can perform 20 years. Many products are available to do this and more. However, it is becoming more common for warranties only being provided for a 5 year term. Among fillers, only carbon black is important in extending roof durability and it is used widely. Roof durability is related to the plastic behavior of many roofing materials. Efforts have been made to provide better reinforcement to prevent plastic flow and improve dimensional stability. 

Pesticides and antimicrobials (biocides) are used in a number of plastics construction materials, mainly to provide resistance to the growth of microorganisms. One common example is their use in a number of PVC and PU grades. PU is commonly used for roofing membranes in construction [22], and several plasticisers, lubricants, thickening agents and fillers that are used with it can support microbial growth effectively. 

HMIS Health 0, Flammability 2, Reactivity 0 Uses Plasticizer, softener, tackifier, processing aid for rubber and plastics raw material for paints and varnishes ore flotation roofing compositions tar soaps asphaltic compositions marine preservative laboratory reagent antidandruff agent in cosmetics plasticizer in food-contact rubber articles for repeated use medicine (cough syrups) Regulatory FDA 21CFR 177.2600... 

Thermoset membranes are compounded from rubber polymers. The most commonly used polymer is ethylene, propylene and a small amount of diene that is vulcanized with various accelerants. This polymer, referred to in the industry as EPDM, is commonly known as rubber roofing . Another thermoset rubber roofing material is neoprene, although this particular formulation is rapidly being replaced by EPDM. Finally, the rubber/plastic hybrid Hypalon is also considered as thermoset. Hypalon is unique in that it is manufactured as a thermoplastic but, because it cures over time, becomes thermoset. 

The problem is to decide on which standard corrugated roof material made of reinforced plastics (glass-reinforced polyester) is to be used in a roof design with specified snow, wind, and live loads. The spacing of the supports is also analyzed, the problem is reduced to the bending of a section of continuous beam 1 ft wide with the supports placed at a specified point. The sag of the roof is limited to 4 in. for a design life of 1000 hours which is assumed to exceed the snow season for the climate considered. 

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