Cellular polystyrene

Physical Stabilization Process. Cellular polystyrene, the outstanding example polytvinyl chloride) copolymers of styrene and acrylonitrile (SAN copolymers) and polyethylene can be manufactured by this process, Chemical Stabilization Processes. This method is more versatile and thus has been used successfully for more materials than the physical stabilization process. Chemical stabilization is more adaptable for condensation polymers than for vinyl polymers because of the fast yet controllable curing reactions and the absence of atmospheric inhibition. Foamed plastics produced by these processes include polyurethane foams, polyisocyanurates. and polyphenols. 

Physical Stabilization Process. Cellular polystyrene, cellulose acetate, polyolefins, and poly(vinyl chloride) can be manufactured by this process, Chemical Stabilization Processes. Cellular rubber and ebonite are produced by chemical stabilization processes. 

Cellular Polystyrene. Composed principally of polymerized styrene resin processed to form rigid foam having a predominantly closed-cell structure. 

D 5113 Test Method for Determining Adhesive Attack on Rigid Cellular Polystyrene... 

The beginning of cellular polystyrene may be dated back to the time of the discovery of a material called styrene. Polystyrene is a clear, brittle, thermoplastic aromatic resin ... 

Table 10.1 Physical properties of commercial extruded polystyrene foams ASTM C578 - Standard for Rigid, Cellular Polystyrene Thermal Insulation... 

Extruded-Polystyrene Foam This material has been produced for over 40 years and is manufactured as billets and boards. It is made by extruding molten polystyrene containing a blowing agent, under elevated temperature and pressure, into the atmosphere, where the mass expands. The billets and boards can be used directly or can be cut into many different forms. Common tools for fabrication are bandsaws, hotwire cutters, planers and routers. Boards may have a cut or planed surface, or may have an integrally extruded skin of extremely small cells. Many sizes are available in extruded cellular polystyrene. BUlets can be... 

ASTM C S78-87a Standard Specification for Preformed, Cellular Polystyrene Thermal Insulation, 7 pp (DOD Adopted) (FSC 5640) (YD) (Comm C-16)... 

This specification covers the composition and physical properties of insulating boards composed of wood-fiber insulation board laminated to rigid cellular polystyrene insulation boards, flat or tapered, used principally above structural roof decks for thermal insulation as well as for a base for roofing in building construction. 

ASTM D 5113-90 Standard Test Method for Determining Adhesive Attack on Rigid Cellular Polystyrene Foam, 2 pp (Comm D-14)... 

This test method is useful in determining the effect of using adhesives on rigid cellular polystyrene (RCPS) foam in building construction. The method covers a practical means of measuring the degree of foam cavitation damage when an adhesive is used to bond these foam substrates. 

MIL-P-40619A Plastic Material, Cellular, Polystyrene (for Buoyancy Applications), 9 December 1968, 8 pp (FSC 9330) (SH) was cancelled by Notice 1 on 4 January 1988, but was then reinstated by Notice 2 on IS September 1988. Furthermore, the Army Missile Command (MI) has assumed Preparing Activity responsibility in lieu of the Naval Sea Systems Command (Ship Systems) (SH)... 

Another example would be those polymers designed for floatation. Here the cells are designed to be nonconnecting, and the polymer itself is preferably hydrophobic. A non-cellular polymer may well float, but its buoyancy properties would not be important. It is only when the upthrust of a fully enclosed cell is considered that the excellent buoyancy characteristics of, say, cellular polystyrene or PVC can be understood. 

Cellular polystyrene with Belgium 861,028 1978 ARCO Polymers... 

The last area of standardization in which the committee started to work was the development of standard specifications for the various GS materials. Although there was an initial resistance to move into this area, it was realized that to complete the loop in standards development, this was a necessary step. Examples of specifications developed thus far include a circular-knit GT for use in subsurface drainage applications, GCs for pavement edge drains and other high-flow apphcations, prefabricated bituminous GMs used as canal and ditch liners, nonreinforced PVC GM seams, non-reinforced PVC GMs used in buried applications, GS alternate daily covers, and rigid cellular polystyrene geofoam. 

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