National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPara... Second Revision No. 1-NFPA 53-2015 [ Section No. F.3.3.8 ] 1 of 16 6/5/2015 2:42 PM National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPara... F.3.3.8 2 of 16 6/5/2015 2:42 PM National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPara... The oxygen index test, ASTM D2863, and variations of it have come into wide use in the last few years for their characterizations of the flammability of materials. In the ASTM procedure, a small, vertically oriented sample is burned downward in a candle-like fashion in an oxygen-nitrogen mixture. The composition of the gas mixture is adjusted to determine the minimum percent of oxygen that will begin to support combustion of the sample. This minimum oxygen concentration is called the oxygen index (OI). Burning in an upward direction can take place more readily and produce a lower OI. The OI test, as determined by ASTM D2863, is limited to nonmetals (e.g., plastics) at ambient pressure. However, the OI concept is now utilized at elevated pressures (and temperatures) and for metals as well as nonmetals (see F.3.4 for the OI data of metals) . Other means of ignition have also been used, as have other oxidants and diluents. (44, 45) Conceptually, an OI is a flammability limit but is more complex than the flammability limit for gas mixtures. Therefore, the OI is only one of several criteria that can be utilized to evaluate the suitability of materials for a specific oxygen application. Data from three standard test methods, as shown in Table F.3.3.8 , are commonly used to evaluate the suitability of nonmetallic materials for oxygen service. The autogenous ignition temperature (AIT) determined by ASTM G72 (or equivalent) provides an indication of the sensitivity of a material to ignition in high-pressure oxygen. The AIT of a material indicates the temperature at which the material spontaneously ignites under the standard test conditions (~1500 psi). The material with the highest AIT, suitable for the application, is usually preferred. The heat of combustion (H of C) determined by ASTM D4809 (or equivalent) provides an indication of the intrinsic heat content of the material when fully consumed in an oxygen-enriched environment. The H of C of a material provides an indication of the damage potential when a material ignites and burns in an oxygen-enriched environment. The material with the lowest H of C, suitable for the application, is usually preferred. The oxygen index (OI) of a material determined by ASTM G125 or ASTM D2863 (or equivalent) indicates the percentage of oxygen (typically flowing in nitrogen) required for a material to self-sustain combustion after positive ignition at ambient pressure. The OI of a material provides an indication of the minimum percentage of oxygen necessary before the material would be expected to continue burning once ignited in an oxygen-enriched atmosphere. The material with the highest OI, suitable for the application, is usually preferred. Table F.3.3.8 provides some OI oxygen compatibility data for nonmetals at ambient pressure. Table F.3.3.8(a) Oxygen Index for Selected Materials (46) a Material Description OI Polyacetal 16 Loctite pipe sealant ® b Nuclear grade PST Anaerobic sealant (cured), cup test 17 b Type PS/T Anaerobic sealant (cured), cup test 20 Poly(methylmethacrylate) Plexiglas 18.5 ± 0.5 ECO/Rubber Epichlorohydrin rubber 18.5 Silicone rubber RTV 102 23 Silastic@ 732 25 SMS 2454 25 RTV 60 28.5 RTV 560 29 RTV 560 mixture User-added 50% glass 36 b Silicone grease Cup test 26 ± 1 ® Rectorseal #15 thread sealant <30.0 3 of 16 6/5/2015 2:42 PM National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPara... a Material Description OI Durabla gasket 28.0 ± 0.5 b Fluorosilicone grease #822 Cup test 30 ® Blue Gard gaskets Blue Gard 3000 Nonasbestos gasket 30.5 ± 0.5 Blue Gard 3200 Nonasbestos gasket 31 Blue Gard 3400 Nonasbestos gasket 52 Blue Gard 3200 Nonasbestos gasket 60 Blue Gard 3000 Nonasbestos gasket 62 Blue Gard 3300 Nonasbestos gasket 68 Nylon Nylon 66 30.5 Nylon 66 (glass-filled) 23.5 CYL-SEAL thread sealant 38 Polyvinylidene fluoride ® Kynar 39 Fluorocarbon rubber ® Viton Brown O-ring 40.5 ± 0.5 Viton, green Green O-ring 42 Viton A 57 Viton A 57.5 Viton E-60C 60.5 ® Viton B , #V494-70 DNP ® Balston filters Type— Epoxy Cut from cylinder 42.5 Type Q-fluorocarbon Cut from cylinder 47 ± 1 Type H-Inorganic Cut from cylinder DNI b ® MOS cup test 45 Molykote Z powder 2 b Bel-Ray greases Cup test 57 b FC1260 Cup test DNP FC1245 Halocarbon oil/graphite ® b Key Abso-Lute Cup test 67 CTFE lubricants b Fluorolube GR362 grease Cup test 67 ± 4 b Halocarbon 25-20 oil Cup test 75 b Halocarbon 11-14S oil Cup test DNP Fluorocarbon FEP Tubing 77 Fluorocarbon PFA 100 Fluorocarbon TFE DNP PFPE grease b Fomblin RT15 Cup test DNP 4 of 16 6/5/2015 2:42 PM National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPara... a Material Description OI ® b Krytox 283AC Cup test DNP b Krytox GPL 225 Cup test DNP b Krytox GPL 205 Cup test DNI b Tribolube 13C Cup test DNP PFPE fluid b Fomblin Y25 Cup test DNI b Krytox GPL 105 Cup test DNP CTFE plastic ® Kel-F 81 15% glass-filled DNP Kel-F 81 Nonplasticized DNP Perfluoroelastomer ® Kalrez 1045 O-ring DNP Kalrez 1050 O-ring DNP Kalrez 4079 O-ring DNP b Silica gel Cup test DNI b Blue drierite Cup test DNI Kaowool insulation Alumina-silica DNI Cerawool paper DNI Fiberglass/cement board DNI ® b Kwik Flux #54 Cup test DNI Asbestos cement board ® Transite DNI ® Sindanyo CS51 DNI ® Turnalite TI 150 DNI 2 Asbestos paper 32 lb/100 ft DNI a DNP: Did not propagate. DNI: Did not ignite. b Cup test performed as described by Nelson, G. L., and Webb, J. L. “Oxygen Index of Liquids, Techniques and Application.” Journal of Fire and Flammability , Vol. 4, July 1973, pp. 210–226. Table F.3.3.8 Oxygen Compatibility Data for Selected Materials (33, 46, 64–74) Trade Name or Generic AIT H of C Material Description (°C) (cal/grm) OI (%) Plastics Chlorotrifluoroethylene ACLAR 22 and 23 349–390 See PCTFE 95–100 (PCTFE) ABS Acrylonitrile-butadiene-styrene 243 8500 18–39 Delrin, Acetal Poly(acetyl) 178–195 4029 14.2–16.1 Copolymer of ethylene and ® 171 3254–3900 52 Halar chlorotrifluoroethylene Hypalon Sheet 0.60 in. Chlorosulfonated polyethylene 6800 25.1 5 of 16 6/5/2015 2:42 PM National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPara... Trade Name or Generic AIT H of C Material Description (°C) (cal/grm) OI (%) Kel-F 81 PCTFE plastic 388 2300 DNP Kynar Polyvinylidene fluoride (PVDF) 268 3277 39–43.7 Lexan Polycarbonate 286 7407 27 Mylar Polyethylene terephthalate 181 2300 22.7 Neoflon, M400H- PCTFE plastic (Daikin Japan) 382 1220 DNP amorphous Neoflon, M400H- PCTFE plastic (Daikin Japan) 377 1230 DNP crystalline Polyphenylene oxide blended with Noryl 348 6615 33.3 polystyrene Nylon Nylon 66, polyamide 178–259 7400–7900 23.5–30.5 PEEK Polyetheretherketone 305–325 7775 35 Plexiglas Poly(methyl methacrylate) 230 6000 17–18.5 Polycarbonate, generic Polycarbonate, generic 300–340 7400–9400 22.5–27.4 Polyester Polyester resin 4300 41.5 Polyethylene (PE) Polyethylene plastic 176 11100 17.5 PPS Polyphenylene sulfide 285 6853 43 PP Polypropylene (PP) 174 11000 17–18 PS Polystyrene, hard plastic 250 9900 17–23 PVC Polyvinyl chloride 239 4300 42–65 PVDC Polyvinylidene chloride 5000 60 Rulon A, E, J, LD Filled TFE fluorocarbon 360–427 1400–2100 DNP Teflon FEP Fluorinated ethylene-propylene 378 2500 77 Teflon PFA Perfluoroalkoxy tetrafluoroethylene 424 1250 100 Teflon TFE Polytetrafluoroethylene 427+ 1700 95–100 ETFE, copolymer of tetrafluoroethylene Tefzel 243 3538 30 and ethylene Ultem Polyetherimide 385 7026 47 Vespel SP21 Polyimide with 15% graphite 328–347 6002–6318 53–65 Zytel Zytel, polyamide 259 7708 36 Lubricants and Sealants PTFE pipe tape (clean) TFE-fluorocarbon tape thread sealant 427+ See TFE 83–100 Bel-Ray FC1245 PCTFE oil/graphite 3709 DNP Bel-Ray FC1260 PCTFE oil/graphite 1117 57 Braycote 667 Perfluoroalkyl polyether grease 427+ Christo-Lube MCG111 Perfluoroalkyl polyether grease 470 1049 DNI CYL-Seal Thread sealant 3294 38 Everlube 6711 Colloidal graphite powder 363 MoS in sodium silicate Everlube 811 (cured) 2 427+ Fluorolube GR362 PCTFE/filler 4994 67 Fluorolube LG160 PCTFE 382 2516 Fluorosilicone grease FS grease 30 #822 Fomblin RT15 Perfluoroalkyl polyether grease 427+ 995 DNP Fomblin Y25 oil Perfluoroalkyl polyether oil 427+ 706 DNI 6 of 16 6/5/2015 2:42 PM National Fire Protection Association Report http://submittals.nfpa.org/TerraViewWeb/ContentFetcher?commentPara... Trade Name or Generic AIT H of C Material Description (°C) (cal/grm) OI (%) Gore-Tex joint sealant 0.25- in. thick white 91 Halocarbon PCTFE oil PCTFE oil (various grades) 385–410 1047–1994 75- DNP Halocarbon PCTFE PCTFE grease (various grades) 427+ 1600–2366 67- DNP grease Kel-F-1, 3, 10 PCTFE oil 374–385 Key Abso-Lute Thread sealant 5155 67 Krytox 240 AB Perfluoroalkyl polyether grease 427+ Krytox 240 AC Perfluoroalkyl polyether grease 427+ 900–1000 DNP Krytox GPL 105 Perfluoroalkyl polyether grease DNP Krytox GPL 205 Perfluoroalkyl polyether grease DNI Krytox GPL 225 Perfluoroalkyl polyether grease DNP Loctite pipe sealant Anaerobic sealant (cured) 170–260 4204–7600 17–20 MoS fluorocarbon spray Molykote