| Material |
Minimum Cloud or Layer Ignition Temperature 1 |
°F |
|
°C |
| CLASS II, GROUP E METAL DUSTS |
|
|
|
|
|
|
|
| Aluminum, atomized collector fines |
1022 |
CI |
550 |
| Aluminum, A422 flake |
608 |
|
320 |
| Aluminum - cobolt alloy (60-40) |
1058 |
|
570 |
| Aluminum - copper alloy (50-50) |
1526 |
|
830 |
| Aluminum - lithium clloy (15% Li) |
752 |
|
400 |
| Aluminum - magnesium alloy (Dowmetal) |
806 |
CI |
430 |
| Aluminum nickel alloy (58-42) |
1004 |
|
540 |
| Aluminum - silicon alloy (12% Si) |
1238 |
NL |
670 |
| Boron, commercial-amorphous (85% B) |
752 |
|
400 |
| Calcium Silicide |
1004 |
|
540 |
| Chromium (97%) electrolytic, milled |
752 |
|
400 |
| Ferromanganese, medium carbon |
554 |
|
290 |
| Ferrosilicon (88%, 9% Fe) |
1472 |
|
800 |
| Ferrotitanium (19% Ti, 1% Fe, 0.06% C) |
698 |
CI |
370 |
| Iron, 98% H 2 reduced |
554 |
|
290 |
| Iron, 99%, Carbonyl |
590 |
|
310 |
| Magnesium, Grade B Milled |
806 |
|
430 |
| Manganese |
464 |
|
240 |
| Silicon, 96%, milled |
1436 |
CI |
780 |
| Tantalum |
572 |
|
300 |
| Thorium, 96%, O 2 |
518 |
CI |
270 |
| Tin, 96%, atomized (2% Pb) |
806 |
|
430 |
| Titanium, 99% |
626 |
CI |
330 |
| Titanium Hydride, (95% Ti, 3.8% H 2 ) |
896 |
CI |
480 |
| Vanadium Hydride, (93.6% Zr, 2.1% H 2 ) |
914 |
|
490 |
| Zirconium Hydride (93.6% Zr, 2.1% H 2 ) |
518 |
|
270 |
|
|
|
|
|
|
|
|
| CLASS II, GROUP F CARBONACEOUS DUSTS |
|
|
|
|
|
|
|
| Asphalt (Brown Petroleum Resin) |
950 |
CI |
510 |
| Charcoal |
356 |
|
180 |
| Coal, Kentucky Bituminous |
356 |
|
180 |
| Coal, Pittsburgh Experimental |
338 |
|
170 |
| Coal, Wyoming |
- |
|
- |
| Gilsonite |
932 |
|
500 |
| Lignite, California |
356 |
|
180 |
| Pitch, Coar, Tar |
1310 |
NL |
710 |
| Pitch, Petroleum |
1166 |
NL |
630 |
| Shale, Oil |
- |
|
- |
|
|
|
|
|
|
|
|
| CLASS II, GROUP G AGRICULTURAL DUSTS |
|
|
|
|
|
|
|
| Alfalfa Meal |
392 |
|
200 |
| Almond Shell |
392 |
|
200 |
| Apricot Pit |
446 |
|
230 |
| Cellulose |
500 |
|
260 |
| Cherry Pit |
428 |
|
220 |
| Cinnamon |
446 |
|
230 |
| Citrus Peal |
518 |
|
270 |
| Cocoa, Bean, Shell |
698 |
|
370 |
| Cocoa, Natural, 19% fat |
464 |
|
240 |
| Coconut Shell |
428 |
|
220 |
| Corn |
482 |
|
250 |
| Corncob Grit |
464 |
|
240 |
| Corn Dextrine |
698 |
|
370 |
| Cornstarch, commercial |
626 |
|
330 |
| Cornstarch, modified |
392 |
|
200 |
| Cork |
410 |
|
210 |
| Cottonseed Meal |
392 |
|
200 |
| Cube Root, South America |
446 |
|
230 |
| Flax Shive |
446 |
|
230 |
| Garlic, dehydrated |
680 |
NL |
360 |
| Guar Seed |
932 |
NL |
500 |
| Gum, Arabic |
500 |
|
260 |
| Gum, Karaya |
464 |
|
240 |
| Gum, Manila (copal) |
680 |
CI |
360 |
| Gum, Tragancanth |
500 |
|
260 |
| Hemp Hurd |
428 |
|
220 |
| Lycopodium |
590 |
|
310 |
| Malt Barley |
482 |
|
250 |
| Milk, Skimmed |
392 |
|
200 |
| Pea Fluor |
500 |
|
260 |
| Peach Pit Shell |
410 |
|
210 |
| Peanut Hyll |
410 |
|
210 |
| Peat, Spaghum |
464 |
|
240 |
| Pecan Nut Shell |
410 |
|
210 |
| Pectin |
392 |
|
200 |
| Potato Starch, Dextrinated |
824 |
NL |
440 |
| Pyrethrum |
410 |
|
210 |
| Rauwolfa Vormitoria Root |
446 |
|
230 |
| Rice |
428 |
|
220 |
| Rice Bran |
914 |
NL |
490 |
| Rice Hull |
428 |
|
220 |
| Safflower Meal |
410 |
|
210 |
| Soy Fluor |
374 |
|
190 |
| Soy Protein |
500 |
|
260 |
| Sucrose |
662 |
CI |
350 |
| Sugar, Powdered |
698 |
CI |
370 |
| Tung Kernels, Oil-Free |
464 |
|
240 |
| Walnut Shell, Black |
428 |
|
220 |
| Wheat |
428 |
|
220 |
| Wheat Fluor |
680 |
|
360 |
| Wheat Glutin, gum |
968 |
NL |
520 |
| Wheat Starch |
716 |
NL |
380 |
| Wheat Straw |
428 |
|
220 |
| Woodbark, Ground |
482 |
|
250 |
| Wood Fluor |
500 |
|
260 |
| Yeast, Torula |
500 |
|
260 |
|
|
|
|
|
|
|
|
| CLASS II, GROUP G CHEMICALS |
|
|
|
|
|
|
|
| Acetoacetanilde |
824 |
M |
440 |
| Acetoacet-o-phenetidide |
1040 |
NL |
560 |
| Adipic Acid |
1022 |
M |
550 |
| Anthranilic Acid |
1076 |
M |
580 |
| Aryl-nitrosomerhylanide |
914 |
NL |
490 |
| Azelaic Acid |
1130 |
M |
610 |
| 2.2 Azo-bis-butyronitrile |
662 |
|
350 |
| Benzoic Acid |
824 |
M |
440 |
| Benzotriazole |
824 |
M |
440 |
| Bisphenol-A |
1058 |
M |
570 |
| Chiloroacetoacetanilde |
1184 |
M |
640 |
| Diallyl Phthalate |
896 |
M |
480 |
Dicumyl Peroxide
(suspended on CaCO 3 ), 40-60 |
356 |
|
180 |
| Dicyclopentadiene Dioxide |
788 |
NL |
420 |
| Dihydroacetic Acid |
806 |
NL |
430 |
| Dimethyl Isophthalate |
1076 |
M |
580 |
| Dimethyl Terephthalate |
1058 |
M |
570 |
| 3.5-Dinitrobenzoic Acid |
860 |
NL |
460 |
| Dinitritoluamide |
932 |
NL |
500 |
| Diphenyl |
1166 |
M |
630 |
| Dietertiary Butyl Paracresol |
878 |
NL |
470 |
| Ethyl Hydroxyethyl Cellulose |
734 |
NL |
390 |
| Fumaric Acid |
968 |
M |
520 |
| Hexamethylebe Tetramine |
770 |
S |
410 |
| Hydroxyethyl Cellulose |
770 |
NL |
410 |
| Isotoic Anhydride |
1292 |
NL |
700 |
| Methionine |
680 |
|
360 |
| Nitrosoamine |
518 |
NL |
270 |
| Para-oxy-benzaldehyde |
716 |
CI |
380 |
| Paraphenylene Diamine |
1148 |
M |
620 |
| Para tertiary Butyl Benzonic Acid |
1040 |
M |
560 |
| Pentaerythritol |
752 |
M |
400 |
| Phenylbetanphthylamine |
1256 |
NL |
680 |
| Phthalic Anydride |
1202 |
M |
650 |
| Phthalimide |
1166 |
M |
630 |
| Salicylanilide |
1130 |
M |
610 |
| Sorbic Acid |
860 |
|
460 |
| Stearic Acid, Aluminum Salt |
572 |
|
300 |
| Stearic Acid, Zinc Salt |
950 |
M |
510 |
| Sulfur |
428 |
|
220 |
| Terephthalic Acid |
1256 |
NL |
680 |
|
|
|
|
|
|
|
|
| CLASS II, GROUP G DRUGS |
|
|
|
|
|
|
|
| 2-Acetylamino-5-nitrothiazole |
842 |
|
450 |
| 2-Amino-5-nitrothiazole |
860 |
|
460 |
| Aspirin |
1220 |
M |
660 |
| Guilasonic Acid, Diacetone |
788 |
NL |
420 |
| Mannitol |
860 |
M |
460 |
| Nitropyridone |
806 |
M |
430 |
| 1-Sorbise |
698 |
M |
370 |
| Vitamin B1, monoitrate |
680 |
NL |
360 |
| Vitamin C (Ascorbic Acid) |
536 |
|
280 |
|
|
|
|
|
|
|
|
| CLASS II, GROUP G DYES, PIGMENTS, INTERMEDIARIES |
|
|
|
|
|
|
|
| Beta-napthalene-azo-Dimethylaniline |
347 |
|
175 |
| Green Base Harmon Dye |
347 |
|
175 |
| Red Dyr Intermediate |
347 |
|
175 |
| Violet 200 Dye |
347 |
|
175 |
|
|
|
|
|
|
|
|
| CLASS II, GROUP G PESTICIDES |
|
|
|
|
|
|
|
| Benzethonium Chloride |
716 |
CI |
368 |
| Bis (2-Hydroxy-5-chlorophenyl) methane |
1058 |
NL |
570 |
| Crag No. 974 |
590 |
CI |
310 |
| Diedrin (20%) |
1022 |
NL |
550 |
| 2.6-Ditertiary-butyl-paracresol |
788 |
NL |
420 |
| Dithane |
356 |
|
180 |
| Ferbam |
302 |
|
150 |
| Manganese Vancide |
248 |
|
120 |
| Sevin |
284 |
|
140 |
| Trithiobis (N,N-Diemethylthio-formamide) |
446 |
|
230 |
|
|
|
|
| CLASS II, GROUP G THERMOPLASTIC RESINS & MOLDING COMPOUNDS |
|
|
|
|
|
|
|
| Acetl Resins |
|
|
|
| Acetal, Linear (Polyformaldehyde) |
824 |
NL |
440 |
|
|
|
|
| Acrylic Resins |
|
|
|
| Acrylamide Polymer |
464 |
|
240 |
| Acrylonitrile Polymer |
860 |
|
460 |
| Acrylonitrile-Vinyl-Pyridine-Copolymer |
464 |
|
240 |
| Acrylonitrile-Vinyl-Chloride-Vinylidene Chloride Copolymer (70-20-10) |
410 |
|
210 |
| Methyl Methacrylate Polymer |
824 |
NL |
440 |
| Methyl Methacrylate-Ethyl-Acrylate Copolymer |
896 |
NL |
480 |
| Methyl Methacrylate-Ethyl Acrylate Styrene Copolymer |
824 |
NL |
440 |
| Methyl Methacrylate-Styrene-Butadiene Acrylonitrile Copolymer |
896 |
|
480 |
| Methacrylic Acid Polymer |
554 |
NL |
290 |
|
|
|
|
| Cellulosic Resins |
|
|
|
| Cellulose Acetate |
644 |
|
340 |
| Cellulose Triacetate |
806 |
NL |
430 |
| Cellulose Acetate Butyrate |
698 |
NL |
370 |
| Cellulose Propionate |
860 |
NL |
460 |
| Ethyl Cellulose |
608 |
CI |
320 |
| Methyl Cellulose |
644 |
|
340 |
| Carboxymethyl Cellulose |
554 |
|
290 |
| Hydroxethyl Cellulose |
644 |
|
340 |
|
|
|
|
| Chlorinated Polyether Resins |
|
|
|
| Chlorinated Polyether Alcohol |
860 |
|
460 |
|
|
|
|
| Nylon (Polyamide) Resins |
|
|
|
| Nylon Polymer (Polyhexa-methylene Adipamide) |
806 |
|
430 |
|
|
|
|
| Polycarbonate Resins |
|
|
|
| Polycarbonate |
1310 |
NL |
710 |
|
|
|
|
| Polyethylene Resins |
|
|
|
| Polyethylene, High Pressure Process |
716 |
|
380 |
| Polyethylene, Low Pressure Process |
788 |
NL |
420 |
| Polyethylene Wax |
752 |
NL |
400 |
|
|
|
|
| Polymethylene Resins |
|
|
|
| Carboxpolyethylene |
968 |
NL |
520 |
|
|
|
|
| Polypropylene Resins |
|
|
|
| Polypropylene (No Antioxidant) |
788 |
NL |
420 |
|
|
|
|
| Rayon Resins |
|
|
|
| Rayon (Viscose) Flock |
482 |
|
250 |
|
|
|
|
| Styrene Resins |
|
|
|
| Polystyrene Molding Compound |
1040 |
NL |
560 |
| Polystyrene Latex |
932 |
|
500 |
| Styrene-Acrylonitrile (70-30) |
932 |
NL |
500 |
| Styrene-Butadiene Latex (< 75% Styrene; Alum coagulated) |
824 |
NL |
400 |
|
|
|
|
| Vinyl Resins |
|
|
|
| Polyvinyk Acetate |
1022 |
NL |
550 |
| Polyvinyl Acetate Alcohol |
824 |
|
440 |
| Polyvinyl Butyrate |
734 |
NL |
390 |
| Vinyl Chloride-Acrylonitrile Copolymer |
878 |
|
470 |
| Polyvinyl Chloride-Dioctyl Phthalate Mixture |
608 |
NL |
320 |
| Vinyl Toluene-Acrylonitrile Butadiene Copolymer |
936 |
NL |
530 |
|
|
|
|
| CLASS II, GROUP G THERMOSETTING RESINS & MOLDING COMPOUNDS |
|
|
|
| Allyl Resins |
|
|
|
| Allyl Alcohol Derivative (CR-39) |
932 |
NL |
500 |
| Urea Formaldehyde Molding Compound |
860 |
NL |
460 |
| Urea Formaldehyde-Phenol Formaldehyde Molding Compound (Wood Fluor Filler) |
464 |
|
240 |
|
|
|
|
| Epoxy Resins |
|
|
|
| Epoxy |
1004 |
NL |
540 |
| Epocy - Bisphenol A |
950 |
NL |
510 |
| Phenol Furfural |
590 |
|
310 |
|
|
|
|
| Phenolic Resins |
|
|
|
| Phenol Formaldehyde |
1076 |
NL |
580 |
| Phenol Formaldehyde Molding Compound (Wood Fluor Filler) |
932 |
NL |
500 |
| Phenol |
554 |
|
290 |
|
|
|
|
| Polyester Resins |
|
|
|
| Polyethylene Terephthalate |
932 |
NL |
500 |
| Styrene Modified Polyester-Glass Fiber Mixture |
680 |
|
390 |
|
|
|
|
| Polyurethane Resins |
|
|
|
| Polyurethane Foam, No Fire Retardant |
824 |
|
440 |
| Polyurethane Foam, Fire Retardant |
734 |
|
390 |
|
|
|
|
|
|
|
|
| CLASS II, GROUP G SPECIAL RESINS & MOLDING COMPOUNDS |
|
|
|
| Alkyl Ketone Dirner Sizing Compound |
320 |
|
160 |
| Cashew Oil, Phenolic, Hard |
356 |
|
180 |
| Chlorinated Phenol |
1058 |
NL |
570 |
| Coumarone-Indene, Hard |
968 |
NL |
520 |
| Ethylene Oxide Polymer |
662 |
NL |
350 |
| Ethylene-Maleic Anhydride Copolymer |
1004 |
NL |
540 |
| Lignin, Hydrolized, Wood-Type, Fines |
842 |
NL |
450 |
| Petrin Acrylte Monomer |
428 |
NL |
220 |
| Petroleum Resin (Brown Asphalt) |
932 |
|
500 |
| Rosin, DK |
734 |
NL |
390 |
| Rubber, Crude, Hard |
662 |
NL |
350 |
| Rubber, Synthetic, Hard (33% S) |
608 |
NL |
320 |
| Shellac |
752 |
NL |
400 |
| Sodium Resinate |
428 |
|
220 |
| Styrene-Maleic-Anhydride Copolymer |
878 |
CI |
470 |
|
|
|
|
| 1 Since the minimum ignition temperture of a layer of a speciific dust is not always lower that the minimum temperature of a cloud of dust, the lower of the two minimum ignition temperatures is listed. If no symbol appears between the two temperature columns, then the layer ignition temperature is shown. " CI " means the cloud ignition temperature is shown. " NL " means that no layer ignition temperature is available and the cloud ignition temperature is shown. " M " means that the dust layer melts before it ignites and the cloud temperature is shown." S " means that the dust layer sublimes before it ignites and the cloud ignition temperature is shown. |
| 2 Certain metal dusts may have characteristics that require safeguards beyond those required for atmospheres containing the dusts of aluminum, magnesium and commercial alloys. As an example, thorium, uranium and zirconium dusts have extremely low ignition temperatures (as low as 20°C) and minimum ignition energies, lower than any material classified in any Class I or Class II Groups. |
