Rigid integral skin foam

Rigid, flexible/slabstock foam, microcellular plastomers,and integral skin foam Rigid, flexible, integral skin, flexible molded,microcellular foam, coatings, and elastomers... 

Flat parts with sufficient draft angle on the side do not require additional demolding aids. Flexible and semirigid integral skin foam parts can be ejected using compressed air. Rigid PUR integral skin foam products are ejected with mechanically or... 

Rigid integral skin polyurethane foams are used to make seat pans, office equipment housings, tanning beds, water skis, and surfboards, all of which must be light and stiff. 

The European Parliament has adopted phase-out dates for the use of HCFCs in rigid foam applications which are basically in line with those in the USA and Japan. From 1 January 2000, the use of HCFCs for integral skin PU and PE foams is prohibited. From 1 January 2002, the use of HCFCs in expanded PS foams is prohibited. From 1 January 2003, the use of HCFCs in flexible-faced PU foam laminates, appliances and sandwich panels is prohibited. EUROPEAN PARLIAMENT... 

The rigid urethane foam concept with integral skins has also found considerable interest in the automotive industry for exterior body parts, such as engine or trunk compartment lids, fenders and even full roofs. These parts can be reinforced with metal inserts where necessary or hinges and fasteners can be molded in for ready mounting. 

Semi-flexible foams (or semi-rigid foams) are sometimes classified as subdivisions of flexible foam because the foams have higher load-bearing properties and good compression recovery. Microcellular flexible foams and integral-skin flexible foams may also be classified in this category. In some classifications, however, microcellular foams are classified as elastomers. 

Integral-skin urethane foams are classified into two types, flexible and rigid. The former foams will be described here, and the latter will be described in the rigid-foam section. 

High-density rigid foam, 5—15 Ib/ft (0.08-0.24 g/cm ), is used for furniture items such as TV and stereo cabinets, chair shells, frames, arms, and legs, cabinet drawer fronts and doors, and mirror and picture frames. RIM-molded, integral-skin, high-density foams with core densities of 10—20 Ib/ft (0.16—0.32 g/cm ) and skin densities of 55-65 Ib/ft (0.88—1.04 g/cm are used in electronic, instrument, and computer cabinets. 

The glass transition temperature lies considerably above the temperature of use with rigid foams and considerably below the temperature of use with flexible foams. The cellular structure may be open, closed, or mixed. All cells are open to each other with open cellular structures. In contrast, each cell is sealed off or encapsulated from the other cells by a plastic wall in closed-cell structures. Structural foams are foams with a dense outer skin and an interior of lower density they are also called integral foams or self-skinning foams. In contrast to normal foams syntactic foams do not directly enclose the gas but contain small hollow bodies of glass, ceramics, or plastics which are under vacuum or are filled with a gas. 

In flexible slabstock and molded polyurethane foam production, methylene chloride, CO2 (liquid or gas injection), and water are used as ABAs. In rigid insulation foams CFCs have been replaced with HFC-134a (sometimes blended with HFC 152a) or liquid CO2. In integral skin polyurethane products, CO2, water, and hydrocarbons are used for the purpose. 

Oldodur Integral-skin-rigid foams Buesting Fasch Co. 

The chemical components (Table II) in integral skin, rigid urethane foams are similar to those used in conventional, high density, rigid urethane wood foams, and include polymeric isocyanates catalysts blowing agents surfactants and polyols. 

Rigid integral skin structural foams are produced in polyurethane materials by the reaction injection moulding (RIM) process. Components of the polymer are metered via a mixing chamber to give a measured short shot in a tool cavity where the polymerisation and the foaming action, which expands the material to fill the cavity, take place. At the cavity-moulding interface the bubbles formed by the... 

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