INSULATION BOARD

Insulation Boa.rd. The panel products known as insulation board were the earliest commodity products made from fibers or particles in the composite panel area. These are fiber-base products with a density less than 500 kg/m. Early U.S. patents were obtained in 1915 and production began soon thereafter. The initial production used wood fiber as a raw material, but later products were made of recycled paper, bagasse (sugar cane residue), and straw. Schematics of the two major processes still ia use are shown ia Figure 4. 

Structural Insulation Boards. Stmctural iasulation boards are made by a process similar to that used for iasulation board, with the exception of another additive which provides additional weight, strength, and water resistance. The additive is normally asphalt, which is added ia a... 

Secondary Treatments and Uses. Insulation boards normally have few secondary treatments. Some boards may receive a coating of primer and others may be laminated into panels of several thicknesses. Insulation boards are used for economical, insulative wall paneling, ceiling tiles, bulletin boards, and similar uses. Laminated panels are used for insulative panels, usually as roof decking or insulation under built-up roofing. 

Stmctural insulation boards are used primarily for wall sheathing in constmctions where wall diaphragm racking resistance is provided by other means, such as stmctural panel corner bracing or metal strip bracing. Where allowed by building codes, these methods of constmction do provide more economical constmction. 

Economic Aspects. In 1994 there were 8 operational insulation board producers in the United States. These mills produced about 1.15 X 10 m (2). The number of mills and total production volume have also decreased in this industry, primarily as a result of changes in building codes and avadabihty of other competitive sheathing products. Both wood composite panels and plastic foam sheathings have captured a segment of these markets. 

Specifications, Standards, Quality Control, and Health and Safety Factors. Formerly, there was an Insulation Board Institute representing the insulation board industry, but the decline in the market and number of producers has led to its demise. Currently (ca 1997), the industry is represented by the American Hardboard Association (AHA). Specifications and standards are found in American National Standards Institute (ANSI) standard for CellulosicFiberboard (7). The standard includes descriptions of the various types and classes of ftberboard, as well as requirements for physical and dimensional stabiUty properties. QuaUty control tests are limited to a few basic strength and stabiUty tests, including bending strength, bond strength, and moisture resistance. 

Fig. 8. Small coreless-induction furnace, 500-kg high, frequency furnace with insulating board housing and cmcible.

Early laminates tended to be small because available presses were small, and their original uses were to replace small parts such as the natural mica insulator boards used in radio chasses. As decorative laminates evolved from industrial laminates and the size grew to serve markets such as tabletops, countertops, and wall paneling, laminate dimensions tended to fall into the typical building module ratio of about two length to one cross, such as 2 x 4s,... 

Work with asbestos insulating board (superseded by EH 71j Ozone health hazards and precautionary measures Occupational exposure limits (annual)... 

Training operatives and supervisors for work with asbestos insulation and coatings Enclosures provided for work with asbestos insulation, coatings and insulating board Removal techniques and associated waste handling for asbestos insulation, coatings and insulating board... 

EH 71 Working with asbestos cement and asbestos insulating board... 

Microporous insulation materials consist mainly of highly dispersed silica with a particle size of only 5-30 nm. The highly dispersed silica powder is pressed to plates, which receive heat treatment up to 800 °C, after which the plates are self-supporting and possess a micropore structure with pore diameter of 0.1pm. The addition of opacifiers to the highly dispersed silica starting material reduces the loss of heat by radiation. The dates for such insulation boards are shown in Table 18. 

COP3 Asbestos Work with asbestos insulation, asbestos coating and asbestos insulating board. 

EH37 Work with asbestos insulation board. 

EH51 Enclosures provided for work with asbestos insulation, coatings and insulating board. 

Work with asbestos insulating board (superseded by EH 71)... 

Foamed polystyrene - which is also known as expanded polystyrene - is used extensively in a variety of applications, ranging from packaging peanuts to insulation board and single-use cups and plates. We produce it by two processes foam extrusion and bead expansion. Both types of expanded polystyrene consist of closed cells, i.e., bubbles with continuous walls. We can visually distinguish the two types of foam by the fact that products made by the expanded bead process consist of discrete beads that are welded together... 

For a 12 mm insulating board with a thermal conductivity of about 0.38 kcal/m,h,°C (equal to 0.044 W/m°C) perpendicular to the sheet, the temperature difference between surface and thickness center under the conditions used was measured to be 10°C at a mean temperature of 190°C. For a hardboard with nearly three times this thermal conductivity it is negligible. For example, for a 3.2 mm hardboard it varies from 1 to 3°C over the 185° to 230°C range. 

Commercial Masonite and Asplund boards and the asphalt-impregnated insulation board were sampled before any commercial heat treatment. The corresponding "thermomechanical" pulps had been produced by pressurized refining of steamed chips. The higher pre-steaming temperature used in the Masonite process resulted In a yield of about 85% as compared to a fiber yield of about 94% of the Asplund pulps, the remainder being dissolved. 

Among lignocellulosic panel products, fiberboard (called fiber insulation board in earlier decades) seems to have caused more fires than the denser products hardboard, particleboard, and plywood. Fiberboard self-heats more because it conducts less of the generated heat out of the... 

Thomas, P. H. Self-Heating of Fihre Insulating Board. Fire Research Stn, Note 306 Boreham Wood, Herts., UR, 1957. 

Method B—This is the same as Method A except that 1 in (25 mm) thick mineral wool insulating board, with a density of 6 to 8 Ib/ft (96 to 128 kg/m ), should be glued to the bottom of each tray to separate the instrument lines from the sheet metal tray. Also, the outside of the tray should be coated with approved intumescent mastic (sin (4.8 mm) dry thickness. 

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