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Hazard class 4.1

Class 4.1: Flammable solid

Solids that ignite readily or can cause fire through friction, plus self-reactive and desensitized explosive materials. Below is every Class 4.1 entry in 49 CFR §172.101 that has a UN/NA number — 126 entries.

IDProper shipping nameClassPG
NA0027Black powder for small arms4.1I
UN1309Aluminum powder, coated4.1II
UN1310Ammonium picrate, wetted with not less than 10 percent water, by mass4.1I
UN1312Borneol4.1III
UN1313Calcium resinate4.1III
UN1314Calcium resinate, fused4.1III
UN1318Cobalt resinate, precipitated4.1III
UN1320Dinitrophenol, wetted with not less than 15 percent water, by mass4.1I
UN1321Dinitrophenolates, wetted with not less than 15 percent water, by mass4.1I
UN1322Dinitroresorcinol, wetted with not less than 15 percent water, by mass4.1I
UN1323Ferrocerium4.1II
UN1324Films, nitrocellulose base, gelatine coated (except scrap)4.1III
NA1325Fusee (railway or highway)4.1II
UN1325Flammable solids, organic, n.o.s.4.1II
UN1326Hafnium powder, wetted with not less than 25 percent water (a visible excess of water must be present) (a) mechanically produced, particle size less than 53 microns; (b) chemically produced, particle size less than 840 microns4.1II
UN1328Hexamethylenetetramine4.1III
UN1330Manganese resinate4.1III
UN1331Matches, strike anywhere4.1III
UN1332Metaldehyde4.1III
UN1333Cerium, slabs, ingots, or rods4.1II
UN1334Naphthalene, crude or Naphthalene, refined4.1III
UN1336Nitroguanidine, wetted or Picrite, wetted with not less than 20 percent water, by mass4.1I
UN1337Nitrostarch, wetted with not less than 20 percent water, by mass4.1I
UN1338Phosphorus, amorphous4.1III
UN1339Phosphorus heptasulfide, free from yellow or white phosphorus4.1II
UN1341Phosphorus sesquisulfide, free from yellow or white phosphorus4.1II
UN1343Phosphorus trisulfide, free from yellow or white phosphorus4.1II
UN1344Trinitrophenol, wetted with not less than 30 percent water, by mass4.1I
UN1345Rubber scrap or shoddy, powdered or granulated, not exceeding 840 microns and rubber contend exceeding 45%4.1II
UN1346Silicon powder, amorphous4.1III
UN1347Silver picrate, wetted with not less than 30 percent water, by mass4.1I
UN1348Sodium dinitro-o-cresolate, wetted with not less than 15 percent water, by mass4.1I
UN1349Sodium picramate, wetted with not less than 20 percent water, by mass4.1I
UN1350Sulfur4.1III
UN1352Titanium powder, wetted with not less than 25 percent water (a visible excess of water must be present) (a) mechanically produced, particle size less than 53 microns; (b) chemically produced, particle size less than 840 microns4.1II
UN1353Fibers or Fabrics impregnated with weakly nitrated nitrocellulose, n.o.s4.1III
UN1354Trinitrobenzene, wetted with not less than 30 percent water, by mass4.1I
UN1355Trinitrobenzoic acid, wetted with not less than 30 percent water, by mass4.1I
UN1356Trinitrotoluene, wetted or TNT, wetted, with not less than 30 percent water by mass4.1I
UN1357Urea nitrate, wetted with not less than 20 percent water, by mass4.1I
UN1358Zirconium powder, wetted with not less than 25 percent water (a visible excess of water must be present) (a) mechanically produced, particle size less than 53 microns; (b) chemically produced, particle size less than 840 microns4.1II
UN1437Zirconium hydride4.1II
UN1517Zirconium picramate, wetted with not less than 20 percent water, by mass4.1I
UN1571Barium azide, wetted with not less than 50 percent water, by mass4.1I
UN1868Decaborane4.1II
UN1869Magnesium or Magnesium alloys with more than 50 percent magnesium in pellets, turnings or ribbons4.1III
UN1871Titanium hydride4.1II
UN1944Matches, safety (book, card or strike on box)4.1III
UN1945Matches, wax, Vesta4.1III
UN2000Celluloid, in block, rods, rolls, sheets, tubes, etc., except scrap4.1III
UN2001Cobalt naphthenates, powder4.1III
UN2213Paraformaldehyde4.1III
UN2254Matches, fusee4.1III
UN2304Naphthalene, molten4.1III
UN2448Sulfur, molten4.1III
UN2538Nitronaphthalene4.1III
UN2555Nitrocellulose with water with not less than 25 percent water, by mass4.1II
UN2556Nitrocellulose with alcohol with not less than 25 percent alcohol by mass, and with not more than 12.6 percent nitrogen, by dry mass4.1II
UN2557Nitrocellulose, with not more than 12.6 percent nitrogen, by dry mass mixture with or without plasticizer, with or without pigment4.1II
UN2623Firelighters, solid with flammable liquid4.1III
UN2687Dicyclohexylammonium nitrite4.1III
UN2714Zinc resinate4.1III
UN2715Aluminum resinate4.1III
UN2717Camphor, synthetic4.1III
UN2852Dipicryl sulfide, wetted with not less than 10 percent water, by mass4.1I
UN2858Zirconium, dry, coiled wire, finished metal sheets, strip (thinner than 254 microns but not thinner than 18 microns)4.1III
UN2878Titanium sponge granules or Titanium sponge powders4.1III
UN2907Isosorbide dinitrate mixture with not less than 60 percent lactose, mannose, starch or calcium hydrogen phosphate4.1II
UN2925Flammable solids, corrosive, organic, n.o.s.4.1II
UN2926Flammable solids, toxic, organic, n.o.s.4.1II
UN29565-tert-Butyl-2,4,6-trinitro-m-xylene or Musk xylene4.1III
UN2989Lead phosphite, dibasic4.1II
UN3089Metal powders, flammable, n.o.s4.1II
UN3097Flammable solid, oxidizing, n.o.s4.1II
UN3175Solids containing flammable liquid, n.o.s.4.1II
UN3176Flammable solid, organic, molten, n.o.s.4.1II
NA3178Smokeless powder for small arms (100 pounds or less)4.1I
UN3178Flammable solid, inorganic, n.o.s.4.1II
UN3179Flammable solid, toxic, inorganic, n.o.s.4.1II
UN3180Flammable solid, corrosive, inorganic, n.o.s.4.1II
UN3181Metal salts of organic compounds, flammable, n.o.s4.1II
UN3182Metal hydrides, flammable, n.o.s4.1II
UN3221Self-reactive liquid type B4.1—
UN3222Self-reactive solid type B4.1—
UN3223Self-reactive liquid type C4.1—
UN3224Self-reactive solid type C4.1—
UN3225Self-reactive liquid type D4.1—
UN3226Self-reactive solid type D4.1—
UN3227Self-reactive liquid type E4.1—
UN3228Self-reactive solid type E4.1—
UN3229Self-reactive liquid type F4.1—
UN3230Self-reactive solid type F4.1—
UN3231Self-reactive liquid type B, temperature controlled4.1—
UN3232Self-reactive solid type B, temperature controlled4.1—
UN3233Self-reactive liquid type C, temperature controlled4.1—
UN3234Self-reactive solid type C, temperature controlled4.1—
UN3235Self-reactive liquid type D, temperature controlled4.1—
UN3236Self-reactive solid type D, temperature controlled4.1—
UN3237Self-reactive liquid type E, temperature controlled4.1—
UN3238Self-reactive solid type E, temperature controlled4.1—
UN3239Self-reactive liquid type F, temperature controlled4.1—
UN3240Self-reactive solid type F, temperature controlled4.1—
UN32412-Bromo-2-nitropropane-1,3-diol4.1III
UN3242Azodicarbonamide4.1II
UN3251Isosorbide-5-mononitrate4.1III
UN3270Nitrocellulose membrane filters, with not more than 12.6% nitrogen, by dry mass4.1II
UN33172-Amino-4,6-Dinitrophenol, wetted with not less than 20 percent water by mass4.1I
UN3319Nitroglycerin mixture, desensitized, solid, n.o.s. with more than 2 percent but not more than 10 percent nitroglycerin, by mass4.1II
UN3344Pentaerythrite tetranitrate mixture, desensitized, solid, n.o.s. or Pentaerythritol tetranitrate mixture, desensitized, solid, n.o.s. or PETN mixture, desensitized, solid, n.o.s., with more than 10 percent but not more than 20 percent PETN, by mass4.1II
UN3360Fibers, vegetable, dry4.1III
UN3364Trinitrophenol (picric acid), wetted, with not less than 10 percent water by mass4.1I
UN3365Trinitrochlorobenzene (picryl chloride), wetted, with not less than 10% water by mass4.1I
UN3366Trinitrotoluene (TNT), wetted, with not less than 10 percent water by mass4.1I
UN3367Trinitrobenzene, wetted, with not less than 10% water, by mass4.1I
UN3368Trinitrobenzoic acid, wetted with not less than 10% water by mass4.1I
UN3369Sodium dinitro-o-cresolate, wetted with not less than 10% water, by mass4.1I
UN3370Urea nitrate, wetted, with not less than 10 percent water by mass4.1I
UN33764-Nitrophenylhydrazine, with not less than 30 percent water, by mass4.1I
UN3380Desensitized explosive, solid, n.o.s.4.1I
UN34741-Hydroxybenzotriazole, monohydrate4.1I
UN3527Polyester resin kit, solid base material4.1—
UN3531Polymerizing substance, solid, stabilized, n.o.s.4.1III
UN3532Polymerizing substance, liquid, stabilized, n.o.s.4.1III
UN3533Polymerizing substance, solid, temperature controlled, n.o.s.4.1III
UN3534Polymerizing substance, liquid, temperature controlled, n.o.s.4.1III
UN3541Articles containing flammable solid, n.o.s.4.1—
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Source: 49 CFR §172.101 via eCFR.gov, current as of Oct 23, 2026. Reference only.