Test System to Study the Ignition of Metals by Polymers in Oxygen PDF Download
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Author: J. Stoltzfus
Publisher:
ISBN:
Category : Fire hazards
Languages : en
Pages : 13
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Book Description
A new test system that uses laser energy to ignite a polymer promoter has been developed at the NASA White Sands Test Facility (WSTF). It will facilitate the study of kindling chain ignition, such as the spread of fire from a burning polymer material to surrounding metal. The test system can be used to answer questions regarding configurational effects on ignition and combustion.
Author: J. Stoltzfus
Publisher:
ISBN:
Category : Fire hazards
Languages : en
Pages : 13
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Book Description
A new test system that uses laser energy to ignite a polymer promoter has been developed at the NASA White Sands Test Facility (WSTF). It will facilitate the study of kindling chain ignition, such as the spread of fire from a burning polymer material to surrounding metal. The test system can be used to answer questions regarding configurational effects on ignition and combustion.
Author: Theodore Aaron Steinberg
Publisher: ASTM International
ISBN: 0803128711
Category : Technology & Engineering
Languages : en
Pages : 532
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Book Description
Author: J. Dees
Publisher:
ISBN:
Category : Carbon steel
Languages : en
Pages : 9
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Book Description
When contaminant particles are present in oxygen systems they can be entrained in the flowing oxygen and collide with system components causing ignition and burning. This particle impact ignition mechanism has been the cause of many fires in oxygen systems and has been systematically studied in the laboratory. For the laboratory studies, materials for particles and targets are generally classified into three groups: metals, oxides (inert), and polymers. Of the three groups, metallic particles and targets have been tested most frequently. Oxide (inert) particles and targets have been studied occasionally. Polymers, however, have not been systematically studied either as particles or as targets.
Author: JM. Stoltzfus
Publisher:
ISBN:
Category : Aluminum particles
Languages : en
Pages : 16
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Book Description
Particle impact ignition has been the primary cause of numerous fires in oxygen systems. This ignition phenomenon is known to occur where particles are present in high-velocity gas and where impact occurs on a flammable material. The particle impact ignition behavior of many metals has been widely studied, but the particle impact ignition behavior of polymeric materials is relatively unknown. Particle impact ignition in polymeric materials is a concern because these materials are commonly used in component seat and seal applications where high-velocity particle impacts can occur. This study evaluates several polymeric materials and compares the threshold temperature, which is the minimum temperature required for ignition, of these materials: Kel-F 81® (CTFE), Teflon® (TFE), polyetheretherketone (PEEK), and Vespel SP-1®(polyimide). The materials were configured as targets in the high-velocity particle impact test system at the NASA White Sands Test Facility. Gaseous oxygen was flowed at 27.5 MPa (4000 psig) and sonic velocity, and the targets were impacted with 2000-?m (0.078-in.) aluminum 2017 particles. This paper discusses the results of these tests and ranks the materials according to their threshold temperatures at these conditions.
Author: Dwight D. Janoff
Publisher: ASTM International
ISBN: 0803120044
Category : Fire testing
Languages : en
Pages : 274
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Book Description
Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 151
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Book Description
Author: F. Benz
Publisher:
ISBN:
Category : Auto-ignition
Languages : en
Pages : 17
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Book Description
Two newly developed methods are discussed that examine ignition and flammability characteristics of polymers in oxygen-enriched environments. These methods were tested with three types of polymers (acrylonitrile butadiene, high-density polyethylene, and polytetrafluoroethylene). The first method comprises a tube furnace assembly and a quartz tube through which a test gas is flowed over a polymer sample located in a combustion boat. The combustion gas flowing through the infrared test cell is analyzed for pyrolysis products using a Fourier transform infrared (FTIR) spectrometer. By measuring the spectral characteristics of the reactant products (spectral absorption bands) as a function of the sample temperature, it is possible to determine some of the pyrolysis properties of the materials. Inspection of the sample while the temperature increases is made possible by viewing the sample through an oblique field-of-view angle to the quartz sampling tube. The sample is monitored visually or recorded with a video camera. Visual monitoring for flame emissions allows for positive identification of the auto-ignition temperature (AIT). With the exception of the high-density polyethylene, the AIT results were in good agreement with previously published values. The FTIR spectrometer was demonstrated to be extremely sensitive for characterizing the compatibility of polymer materials with oxygen. The second method discussed is a modification to a Differential Scanning Calorimeter (DSC). This device, which utilizes a silicon photodiode coupled to the DSC chamber via a light pipe assembly, is used to detect radiative flame emissions from a polymer test sample, The modification provides a method of identifying the AIT threshold, while simultaneously measuring endothermic and exothermic responses. The photodiode detector assembly has been adapted for use with the high-pressure DSC cell configuration. The visible wavelength bandpass of the silicon photodiode has a weak response to the radiation heat of the sample or DSC chamber for temperatures under 500 K. Thus, flames with temperatures in excess of 500 K are easily distinguished from the radiative response of the chamber or slow reaction rates (no visible flame emissions). The testing of the DSC demonstrated the merit of using the radiative flame emissions as the primary signature for the identification of the auto-ignition condition. The method reduces or eliminates ambiguity associated with interpretation of exothermic reactions. Thus, the new instrumentation provides viable methods of determining the AIT for polymers in oxygen-enriched environments.
Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 2540
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 538
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: B. E. Newton
Publisher: ASTM International
ISBN: 9780803134706
Category : Technology & Engineering
Languages : en
Pages : 408
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Book Description
