... test results and consequently the derived kinetics and energetics parameters. In this work, six preparations each of a charring polymer, polyvinyl chloride (PVC), and noncharring polymer, polymethyl methacrylate (PMMA), were produced by varying the durations of cryogenic milling. The preparations were...

... Leveraging the experience and lessons learned from the National Center for Advanced Material Performance (NCAMP) and the Composite Materials Handbook–17 (CMH-17) composite material databases, a new qualification program for polymer materials for additive manufacturing (AM) has been developed...

... Some high-pressure oxygen-breathing gas components have been transitioning from predominantly halogenated (fluorinated or chlorinated) polymers to non-halogenated materials for seats and seals. The rationale for the material changes was related to reducing the risk associated with production...

... An approach for fire risk assessment of polymers in oxygen breathing systems is presented. The approach separates the fire risk of polymers into the probability of ignition and the consequence (severity) of ignition. Recommended methods for estimating the probability of ignition, the severity...

... mechanical impact oxygen compatibility polymers Journal of ASTM International, Vol. 3, No. 5 Paper ID JAI13547 Available online at www.astm.org David Hirsch,1 Sam Motto,2 Gary Peyton,3 and Harold Beeson4 Pro ciency Testing for Evaluating Aerospace Materials Test Anomalies ABSTRACT: ASTM G 86 Standard...

... formation. polishes polish properties polymers monomers metal crosslinking waxes dispersion particles solvent classifications coalescent plasticizer defoamer wetting agent leveling agent stabilizer biocide slip resistance gloss durability water resistance detergent resistance...

... NASA started evaluating compatibility of polymers with oxygen more than 30 years ago. New test methods and a systematic approach to evaluate oxygen system hazards were developed. The new methods were used extensively to acquire data on a large number of polymers. NASA's batch-lot control...

... During hazard analyses of oxygen-enriched systems, the flammability of polymers is commonly assessed by reviewing standard limiting oxygen index (LOI) data available in the literature and summarized in ASTM Standard Guide for Evaluating Nonmetallic Materials for Oxygen Service (ASTM G 63...

... clearly ranked the surface-active detergents and the less active dispersants. Frequency dependent EIS, and DETA, as well as CV can be easily used for characterizing chemical additives for engine oils. electrochemical impedance spectroscopy dielectric thermal analysis cyclic voltammetry polymers...

..., silicone, Zytel 42®, Viton A®, and Kel-F 81®. autoignition temperature breathing-air devices compatibility flammability mechanical impact oxygen oxygen compatibility polymers pressure effects promoted combustion safety upward flammability Coleman J. Bryan, l David B. Hirsch,2 Jon Haas...

... to their threshold temperatures at these conditions. particle impact oxygen flammability fire materials ignition resistance ignition mechanism polymers aluminum particles Elliot T. Forsyth,1Timothy D. Gallus,2 and Joel M. Stoltzfus3 Ignition Resistance of Polymeric Materials to Particle Impact...

... The theory of irreversible thermodynamics is applied to derive governing equations for history-dependent diffusion in polymers and polymer matrix composites from first principles. A special form for Gibbs free energy is introduced using stress, temperatures, and moisture concentration...

... and BS 3N 100 on Viton® 6 at 10.3 MPa. Statistically these results had a probability of less than 5 percent of occurring by chance. autoignition temperature oxygen compatibility polymers test methods David Hirsch,~Coleman Bryan,2Herr6 Barthrlrmy,3Ting Chou,4and Christian Binder5 An Analysis...

... temperature (AIT) testing was conducted per ASTM G 72. Polyethylene, polyoxymethylene, polytetrafluoroethylene (PTFE), polyamide, hexafluoropropylene/vinylidene fluoride copolymer, and silicone were the polymers used. After a fixed number of pneumatic impact tests was performed at set pressures, a plot...

... of their successes. Polysulfide Polymers Secondary Containment Primary Containment Sealants Coatings Michael J. Scherrer1 SEALANTS AND COATINGS FOR SECONDARY CONTAINMENT REFERENCE: Scherrer, M. J., "Sealants and Coatings for Secondary Containment," Science and Technology of Building Seals, Sealants...

... is reported. In addition, a qualitative description of the combustion mechanism and powder growth is suggested for each metal. In these experiments, the metals burned in heterogeneous reactions. oxygen flammability fire materials tested mechanisms tested alloys polymers 1 23 4 D. Bruce Wilson...

... The characterization of polymers can be a diverse process involving many different techniques. When dealing with an oxygen environment, the identification of compatible polymeric materials is essential, especially in an ever changing chlorofluorocarbon solvent-free world. At the Kennedy Space...

... polymers including TFE®, Kel-F® 81, Viton® A, Viton® A-500 and Fluorel® exhibited superior oxygen compatibility property. Specifically, they possessed relatively high autoignition temperatures and reasonably low heat of combustion values. Among them, TFE® possessed the best property by showing the highest...

... impact polymers oxygen concentration pressure effects 12 3 4 David Hirsch, Fu-Yu Hshieh, Harold Beeson, and Coleman Bryan IGNITIBILITY IN AIR, GASEOUS OXYGEN AND OXYGEN-ENRICHED ENVIRONMENTS OF POLYMERS USED IN BREATHING-AIR DEVICES REFERENCE: Hirsch, D., Hshieh, F., Beeson, H., and Bryan, C...

... Interactions between some water-soluble polymers used as spray drift control additives in spray tank mixes and a range of anionic, sulfonated surfactants were investigated. Changes in the shear viscosity of the solutions were used as an indicator of interactions. Anionic polymers showed...