Heat insulation materials

Table 11. Properties of heat insulation materials obtained by synthesis of PE on perlite [ 18]...

The superhigh-filled composite materials obtained by PE polymerization on formed perlite particles present in the amount of 80 to 95% by mass can be used to advantage as heat insulation materials (see Table 11). 

The low conductivity of heat insulating materials, such as cork, glass wool, and so on, is largely accounted for by their high proportion of air space. The flow of heat through such materials is governed mainly by the resistance of the air spaces, which should be sufficiently small for convection currents to be suppressed. 

A removable layer of heat-insulating material applied to any process vessel to reduce heat... 

Several amphiboles are fibrous and fibers from them can be processed to give heat-insulating materials. Among these are tremolite and crocidolite. These minerals are also used as fibers in composites. 

The process of preparing compositions based on high-porosity aminoresins that can be used as heat-insulating materials for buildings is reported in Ref. [13]. 

When plastic foam is intended for use as a heat insulating material it is desirable to reduce the contribution of each of the above components to the total value X. 

Garalevicius R Medzevicius V, Roshchupkin V.I., Faintsimer R.Z., Yakolvev, D.A. Romanauskas, A. (1978) Composition for Preparing a Heat-Insulating Material. USSR Patent SU 339173. 

In using heat-insulating materials it is necessary to realize that insulation necessarily raises the mean temperature of the wall between the surface exposed to the heat and the insulation to a point far above that applying to ordinary conditions. The damming up of the heat thus raises especially the temperature of the surface of the firebrick. It is inevitable therefore that insulation requires the use of materials which are more heat resisting. Many instances are on record where firebrick have failed soon after insulation was applied. Heat insulation may thus be said to have increased the necessity for superior refractories. 

The body and crucible of the furnace (see Fig. 33) will be considered first. The body is made from half a standard brick of some good heat-insulating material of considerable refractory endurance. There are several good brands of refractory bricks on the market, such as Sil-O-Cel, Nonpareil, Osceola, etc. A hole lx/2... 

Extruded foam polystyrene (EFPS) is used in construction as heat insulation material, leave-in-place forms, and so on. However, insufficient temperature resistance prevents its widespread use as a structural building material. 

The flammability of plastics can be a useful tool in their identification, but the additives present have an influence on their ability to bum. A clear test to indicate the presence of chlorine, mainly found in PVC and poly(vinylidene chloride) is the Beilstein test. A clean, copper wire 30-40 cm long, with a cork or other heat-insulating material at one end as a handle, is heated with a Bunsen burner to clean it of residual impurities, heating it until the flame is colourless. The hot, cleaned wire is placed in contact with the plastic to be analysed so that a small piece is melted onto it. The wire is returned to the flame and the colour noted a green or blue-green flame denotes the presence of chlorine while other colours suggest the plastic to be other than PVC or poly(vinylidene chloride). 

Adhesives Tile adhesives, adhesives for floorings, walling materials and heat-insulating materials, adhesives for Joining new cement concrete or mortar to old cement concrete or mortar, etc. 

The Beiktein or copper wire test clearly indicates the presence of chlorine, bromine and iodine and was developed by Friedrich Konrad Beiktein (1838— 1906) (Vogel, 1978). It is widely used to identify PVC. A clean, copper wire 30—40 cm long with a cork, or other heat-insulating material, at one end as an insulating handle, is heated with a Bunsen burner or other flame source until the flame k colourless to clean it of residual impurities and to develop a coating of copper (U) oxide. The hot copper is then placed in contact with the... 

Zr02 Heat insulation Heat-insulating materials... 

The foaming process widens the spectrum of applications of polyurethanes. It can be induced by addition of a blowing agent or by a slight excess of isocyanate and addition of a little water. In this case, CO2 is split off from the isocyanate, then forms fine, evenly distributed bubbles. Polyurethane foam can be produced with either hard or elastic properties. The former type is used in applications such as heat insulation material in refrigerators, the latter for furniture and car seat upholstery. 

Long period heated insulating material can become pulverulent. In that case, insulating material and iron sheet should be dismantled in the same time. The system is then isolated from premises and ventilated. Insulating material is wrapped into vinyl. 

Total diameter (pipe + heat insulator material and alinninium sheet) 0,30 m. 

Yi A-h, Liu J-y, Zhao X, Yang Z. Study of the combustion performance of three kinds of organic heat insulation materials. Procedia Eng 2011 11 614—619. 

Anticondensation paint n. Coating designed to minimize the effects of condensation of moisture under intermittently dry and humid conditions. Such a material normally has a matt textured finish and firequently contains heat-insulating material as a filler. 

INSULATION [see also SUPERINSULATION] Performance of Heat Insulating Materials Down to 20 K (1) 212 Vacuum-Powder Insulation (1) 216 Styrofoam (Expanded Polystyrene) Insulation at Low Temperatures (1) 230 The Effect of Some Variables in Low Temperature Processes (1) 342 Characteristics of Some Insulations for Liquid Oxygen Transfer Lines (2) 156 A Comparison of Insulating Materials (3) 416... 

Again, granite is recommended due to its lower mass. The front and back surfaces of each solid-form steel block square are recessed and fitted with a heat-insulating material, to avoid heat transfer and hence expansion when handled. 

Heaters not suitable for use on wood floors shall not be set directly upon them or other combustible materials. When such heaters are used, they shall rest on suitable heat insulating material or at least 1-inch concrete, or equivalent. The insulating material shall extend beyond the heater 2 feet or more in all directions. 

Kiln Car. A car for the support of ware in a tunnel kiln or bogie kiln the car has four wheels and runs on rails. In a tunnel kiln, through which a number of these cars are moved end-to-end, the metal undercarriages are protected from the hot kiln gases by continuous sand-seals. The car deck is constructed of refractory and heat-insulating material. 

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