Blowing agents organic

Other Uses. Other appHcations for sodium nitrite include the syntheses of saccharin [81-07-2] (see Sweeteners), synthetic caffeine [58-08-2] (22), fluoroaromatics (23), and other pharmaceuticals (qv), pesticides (qv), and organic substances as an inhibitor of polymerization (24) in the production of foam blowing agents (25) in removing H2S from natural gas (26) in textile dyeing (see Textiles) as an analytical reagent and as an antidote for cyanide poisoning (see Cyanides). 

Physical blowing agents are low boiling point organic compounds (e.g., dichloromethane or... 

These products are most usually formed by moulding or extrusion processes and have a solid outer skin around the cell structure. Organic blowing agents are used for this type of process. Extender... 

Uses Solvent recovery and extraction blowing agent for plastic foams low temperature thermometers natural gas processing plants production of olefin, hydrogen, ammonia fuel production pesticide manufacture of artificial ice organic synthesis. 

Uses Aerosol propellant refrigerant solvent blowing agent for polyurethane foams fire extinguishing chemical intermediate organic synthesis. 

Nonfluorine CFC substitutes have been considered, but few are fully satisfactory. For example, we could go back 50 years to the use of anhydrous ammonia as a refrigerant, but NH3 is as toxic now as it ever was. Cyclopentane could be used as a foam-blowing agent, but it is less effective than HCFC-141b and besides would contribute to the volatile organic compound load in the troposphere, which is the root cause of ozone pollution (Section 8.3.2). On the other hand, supercritical CO2 is emerging as an alternative to CFCs in various steps in the preparation of fluorocarbon polymers (Section 8.1.3). 

The upper temperature limit for safe operation depends on the onset decomposition temperatures of peroxides and blowing agents employed. Preferred chemical crosslinking agents are organic peroxides, such as dicumyl peroxide (8). 

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