49 CFR 172 Special Provision A20 (A-Codes)

These provisions apply only to transportation by aircraft.

Code	A20
Description	Plastic bags as inner receptacles of combination packagings are not authorized for transportation by aircraft.
HazMat with this Code	UN 3317 - 2-Amino-4,6-Dinitrophenol, wetted with not less than 20 percent water by mass UN 3376 - 4-Nitrophenylhydrazine, with not less than 30 percent water, by mass UN 1390 - Alkali metal amides UN 1394 - Aluminum carbide UN 1395 - Aluminum ferrosilicon powder UN 1396 - Aluminum powder, uncoated UN 1923 - Calcium dithionite or Calcium hydrosulfite UN 1868 - Decaborane UN 1320 - Dinitrophenol, wetted with not less than 15 percent water, by mass UN 1321 - Dinitrophenolates, wetted with not less than 15 percent water, by mass UN 1322 - Dinitroresorcinol, wetted with not less than 15 percent water, by mass UN 2545 - Hafnium powder, dry UN 1326 - Hafnium 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 microns UN 2805 - Lithium hydride, fused solid UN 1417 - Lithium silicon UN 2004 - Magnesium diamide UN 2624 - Magnesium silicide UN 1336 - Nitroguanidine, wetted or Picrite, wetted with not less than 20 percent water, by mass UN 1337 - Nitrostarch, wetted with not less than 20 percent water, by mass UN 1369 - p-Nitrosodimethylaniline UN 1483 - Peroxides, inorganic, n.o.s UN 1339 - Phosphorus heptasulfide, free from yellow or white phosphorus UN 1340 - Phosphorus pentasulfide, free from yellow or white phosphorus UN 1341 - Phosphorus sesquisulfide, free from yellow or white phosphorus UN 1343 - Phosphorus trisulfide, free from yellow or white phosphorus UN 2257 - Potassium UN 1929 - Potassium dithionite or Potassium hydrosulfite UN 1491 - Potassium peroxide UN 1382 - Potassium sulfide, anhydrous or Potassium sulfide with less than 30 percent water of crystallization UN 2466 - Potassium superoxide UN 1420 - Potassium, metal alloys, liquid UN 3403 - Potassium, metal alloys, solid UN 1428 - Sodium UN 2835 - Sodium aluminum hydride UN 1348 - Sodium dinitro-o-cresolate, wetted with not less than 15 percent water, by mass UN 1384 - Sodium dithionite or Sodium hydrosulfite UN 2318 - Sodium hydrosulfide, with less than 25 percent water of crystallization UN 1504 - Sodium peroxide UN 1385 - Sodium sulfide, anhydrous or Sodium sulfide with less than 30 percent water of crystallization UN 2547 - Sodium superoxide UN 1871 - Titanium hydride UN 2546 - Titanium powder, dry UN 1352 - Titanium 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 microns UN 1437 - Zirconium hydride UN 2008 - Zirconium powder, dry UN 1358 - Zirconium 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 microns

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