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Ignition temperature hydrogen

Figure 4. The temperature in units of 1000 K is given as a function of Lagrangian mass for models with L = 55,000 L , Teff = 15,500 K, R = 33.4 R and envelope composition X = 0.7, Y - 0.295, Z = 0.005, fora range of total masses. This luminosity corresponds to original main sequence mass of about 15 M and a helium core mass of 4 M . Note that for smaller total mass and hence smaller envelope mass the temperature rises rapidly to exceed the hydrogen ignition temperature well outside the core. Figure 4. The temperature in units of 1000 K is given as a function of Lagrangian mass for models with L = 55,000 L , Teff = 15,500 K, R = 33.4 R and envelope composition X = 0.7, Y - 0.295, Z = 0.005, fora range of total masses. This luminosity corresponds to original main sequence mass of about 15 M and a helium core mass of 4 M . Note that for smaller total mass and hence smaller envelope mass the temperature rises rapidly to exceed the hydrogen ignition temperature well outside the core.
The self-ignition temperature of PVF film is 390°C. The limiting oxygen iadex (LOI) for PVF is 22.6% (98), which can be raised to 30% ia antimony oxide-modified film (99). Hydrogen fluoride and a mixture of aromatic and aUphatic hydrocarbons (100) are generated from the thermal degradation of PVF. Toxicity studies, ie, survival and time to iacapacitation, of polymers, ceUulosics (101,102), and airplane iaterior materials (103) expose... [Pg.381]

Zirconium powder reacts exothermically with many other elements, including hydrogen, boron, carbon, nitrogen, and the halogens, although the ignition temperature is usually above 200°C. The reaction between zirconium powder and platinum is especially violent. [Pg.432]

The substitution of one hydroxyl radical for a hydrogen atom in propane produces propyl alcohol, or propanol, which has several uses. Its molecular formula is C3H7OH. Propyl alcohol has a flash point of 77°F and, like all the alcohols, bums with a pale blue flame. More commonly known is the isomer of propyl alcohol, isopropyl alcohol. Since it is an isomer, it has the same molecular formula as propyl alcohol but a different structural formula. Isopropyl alcohol has a flash point of 53 F. Its ignition temperamre is 850°F, while propyl alcohol s ignition temperature is 700 F, another effect of the different stmcture. Isopropyl alcohol, or 2-propanol (its proper name) is used in the manufacture of many different chemicals, but is best known as rubbing alcohol. [Pg.198]

Fire Hazards - Flash Point (deg. F) 252 OC Flammable Limits in Air (%) Not pertinent Fire Extinguishing Agents Water Fire Extinguishing Agents Not To Be Used Not pertinent Special Hazards of Combustion Products Toxic fumes include oxides of phosphorous, sulfur and hydrogen chloride Behavior in Fire Containers may rupture Ignition Temperature (deg. F) 338 Electrical Hazard No data Burning Rate No data. [Pg.40]

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