For polyurethane one component of the mixture is polyisocyanate and the other component is a blend of polyol, surfactant, catalyst, and blowing agent.
12.
It was developed as a " fourth generation " refrigerant to replace R-134a and as a blowing agent for foam and aerosol applications.
13.
Otherwise excessive exothermic heat because of high loading of a physical blowing agent can cause thermal degradation of a developing thermoset or polyurethane material.
14.
Once formed the low molecular weight compounds will never revert to the original blowing agent ( s ), i . e . the reaction is irreversible.
15.
The availability of chlorofluoroalkane blowing agents, inexpensive polyether polyols, and methylene diphenyl diisocyanate ( MDI ) allowed polyurethane rigid foams to be used as high-performance insulation materials.
16.
Because of its high vapor pressure, it is used for quick-drying finishes and as a blowing agent for some polyurethane foam applications and as a replacement for HFCs.
17.
"Expandable microspheres " are polymer microspheres that are used as a blowing agent in e . g . puff ink, automotive underbody coatings and injection molding of thermoplastics.
18.
The warehouse contains sodium borohydride, which is used as a bleaching agent for wood pulp, and blowing agent for plastics, among other uses, fire spokesman Hector Torres said.
19.
The report determined that the external fuel tank, ET-93, " had been constructed with BX-250 ", a closeout foam whose blowing agent was CFC-11 and not the newer HCFC 141b.
20.
"' 1, 1, 1, 3, 3-Pentafluoropropane "'( "'HFC-245fa "') is a hydrofluorocarbon used primarily for closed-cell blowing agents formerly used for this purpose, it has no ozone depletion potential and is nearly non-toxic.
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