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3l APPENDIX C DUSTS WITH CLOUD IGNITION TEMPERATURES LOWER THAN THEIR LAYER IGNITION TEMPERATURES Bureau of Mines Report of Investigations Reference Number 8 8 8 8 8 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 5 5 Line Nunber in Reference 59 9 59 70 88 l49 60 93 l22 l43 l82 and l83 20l 208 228 273 l 5 6 7 8 l2 29 33 35 84 l23 l24 Material Ignition Tem- perature, °C Asphalt, blown petroleum resin Dextrin, USP Detergent Soap powder Anthracene and potassium perchlorate Aluminum Monochlorotrifluoroethylene polymer Styrene-hydrocarbon monomer copolymer Vinyl multipolymer contain- ing monomeric vinylidene cyanide Urea-formaldehyde molding compound Phenol-formaldehyde deriv- ative Gum, manila Sodium resinate Styrene-maleic anhydride copolymer Para oxybenzaldehyde Aluminum, atomized atomized atomized Aluminum, Aluminum, Aluminum, atomized Aluminum, atomized Aluminum, atomized Aluminum, atomized Aluminum, atomized Aluminum, atomized Aluminum, fluid milled Iron, carbon reduced Iron, carbon reduced Cloud 5l0 4l0 540 430 530 550 600 460 500 490 460 360 380 470 380 650 550 700 640 640 790 830 700 700 550 450 450 Layer 550 440 570 600 700 660 720 470 5l0 530 480 390 480 490 430 760 840 740 770 750 860 900 830 900 630 500 530
32 Bureau of Mines Report of Investigations Ignition Tern- Reference Line Number perature , °c Numoer in Referenoa Cloud Layer 5 l67 Manganese, electrolytic 450 470 5 l76 Silicon, milled 780 950 5 l77 Silicon 850 900 5 l90 Thorium 270 230 5 l94 Titanium 330 5l0 5 l95 Titanium 470 480 5 202 Titanium 380 660 5 204 Titanium, hydride 440 500 5 205 Titanium, hydride 480 540 5 24l Aluminum-iron alloy 870 900 5 249 Aluminum-magnesium alloy, 430 480 milled 5 266 Calcium silicide 690 800 5 28l Ferrotitanium, low carbon 370 400 5 3ll Manganese ore, sulfide 330 350 7 4 Aluminum acetate 560 640 7 7 Benzoic acid 560 680 7 44 Stearic acid 420 440 7 55 Sulfur 2l0 260 7 56 Sulfur l90 220 7 6l Alkylarylsulfonate, sodium 540 570 7 63 Amino acids 670 700 7 77 2-Amino-5-nitrothiazole 400 4l0 7 83 Duomycin fermentation residue 550 600 7 l0l Vitamin B2 powder 500 5l0 7 ll2 Diazotized meta-nitro-para 380 4l0 7 7 7 7 3 3 3 l32 l40 l7l l74 l78 l79 l80 toluidine coupled with beta naphthol Benzethonium chloride 380 4l0 Dichlorodiphenyltrichloro- 650 700 ethane (DDT) Sodium 2, 4-dichlorophenoxy- 580 600 ethyl sulfate 3,4,5,6-Tetrahydro-3,5-di- 3l0 330 methyl-2H-l,3,5-thiadia- zine-2-thione Sucrose, chemically pure 420 470 Sugar, powdered 370 400 Sugar, raw, light brown 350 460
