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Flameless ration heater

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129: 431: 166: 20: 250:(FAA) conducted testing and released a report which in summary states "... the release of hydrogen gas from these flameless ration heaters is of a sufficient quantity to pose a potential hazard on board a passenger aircraft." This testing was performed on commercial grade 'heater meals' which consisted of an unenclosed flameless heat pouch, a bag of salt water, a styrofoam saucer/tray and a meal in a sealed, microwavable/boilable bowl. 412: 2394: 174:
water is then added to the bag, using the line printed on the bag as a marker. The chemical reaction begins immediately, and takes about 12 to 15 minutes to heat a food pouch to about 60 °C (140 °F). It is recommended to place the bag within the cardboard carton the MRE is issued with to prevent injury, and to prop it upright so the water does not leak out and prematurely stop the reaction.
92:. This was slow, especially in cold weather, and was made more difficult in windy or wet conditions. It also produced a visible flame that was undesirable at night. Sometimes they heated the pouches by placing them on a hot vehicle's engine block or exhaust manifold. Because of these problems, service members frequently ate their meals cold due to a lack of a heating source or a lack of time or both. 672: 450: 266:. Un-activated MRE heaters pose a potential fire hazard if they become wet when turned in at a landfill site. MRE heaters must be disposed of in approved solid waste containers aboard the installation after they have been properly activated. The FRH can be disposed of as household waste after it is activated and cools down. 173:
The flameless ration heater is issued in a plastic bag with instructions printed on it. Inside the bag is a small quantity of metallic powders, which does the actual heating. To heat a meal, the bag is first torn open, and a sealed food pouch is placed inside. About 1 US fluid ounce (30 mL) of
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that can generate electricity. When water is added to a ration heater, it dissolves the salt to form a salt-water electrolyte, thereby turning each particle of magnesium and iron into a tiny battery. Because the magnesium and iron particles are in contact, they essentially become thousands of tiny
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fuel bar. 100% preferred the flameless ration heater: it was compact, disposable, and didn't require equipment to carry and clean. However, it was about twice as expensive as a trioxane fuel bar. Although, it was discovered that in cold climates, two or even three trioxane bars would be needed to
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The main disadvantage of the magnesium-based heaters is the production of hydrogen gas. While it is not often a risk when used in the field, it may pose a fire hazard for consumer use. Alternative formulations have been developed to eliminate the hydrogen gas, such as the combination of aluminum
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Other prototypes were developed, such as the Mounted Ration Heating Device (MRHD), an electrical device that could be powered from a vehicle's power supply and used to heat up to four rations at once. The MRHD was generally preferred over the Zesto-Therm pads, but not all vehicles had the proper
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One brand of self-heating rations uses 7.5 grams of a powdered magnesium-iron alloy, consisting of 95% magnesium and 5% iron by weight, 0.5 grams of salt, in addition to an inert filler and anti-foaming agent. Upon adding one US fluid ounce (30 ml) of water, this mixture can raise the
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was contracted to develop it into a prototype MRE heater, which was called the Dismounted Ration Heating Device (DRHD). The inventors later incorporated under the name Zesto-Therm Inc. and patented the meal heating product (now called the ZT Energy Pad), and began selling it for civilian use.
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evaluated the ZT Energy Pad and found that it did not always heat the food adequately and left a messy residue on the outside of the food pouches. A focus group of 26 soldiers was surveyed to compare heating an MRE with a Zesto-Therm pad compared to the canteen cup method heated with a
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A package needed to be developed to safely cook the food in while the chemical reaction was activated. Zesto-Therm already had a line of insulated cooking pouches on the market, but they were found to be too expensive and impractical to be issued with each MRE. A
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This reaction is analogous to iron being rusted by oxygen, and proceeds at about the same slow rate, which is too slow to generate usable heat. To accelerate the reaction, metallic iron particles and table salt (NaCl) are mixed with the magnesium particles.
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Once the design was finalized, the acquisition process was quickly completed. In May 1990, the FRH was approved for bulk issue. A process that normally takes four to six years to award contracts was instead completed in one year so the FRH could be used in
149:, would protect the chemical from accidental activation when stored, could withstand the temperatures required during cooking, and was transparent so the service member could easily measure a quantity of water by filling it to a line printed on the bag. 429:, Sergius S. Sergev, Stanley A. Black, James F. Jenkins, "Supercorroding galvanic cell alloys for generation of heat and gas", published 1981-04-28, assigned to The United States Of America As Represented By The Secretary Of The Navy 410:, Stanley A. Black & James F. Jenkins, "Powdered metal source for production of heat and hydrogen gas", published 1977-04-12, assigned to The United States Of America As Represented By The Secretary Of The Navy 132:
A Mounted Ration Heating Device, a prototype Flameless Ration Heater. Service members would power the device using the attached cable and a running vehicle. Up to four MRE pouches could be heated at once.
157:. 51 million FRHs were purchased for $ 25 million, and approximately 4.5 million FRHs were shipped to Southwest Asia for the Gulf War. Beginning in 1993, one FRH was packaged with each MRE. 222:
temperature of a 8-ounce (230 g) meal packet by 100 °F (38 °C) in about 10 minutes, releasing approximately 50 kilojoules (47 BTU) of heat energy at about 80 watts.
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began research into a chemical method to heating meals in 1973. The FRH was first issued in May 1990, and an FRH was included with each MRE since 1993.
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short-circuited batteries which quickly burn out, producing heat in a process the patent holders call "supercorroding galvanic cells".
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Before the development of the FRH, service members heated their meals by boiling the food pouches in a canteen cup heated over a lit
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had developed a magnesium-iron alloy powder for buoyancy devices and heated diving vests. This was more cost efficient, so the
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connections to power the device, and having a single device meant service members needed to take turns using it.
2198: 2067: 1666: 1086: 1056: 946: 495:"The Fire Safety Hazard of the Use of Flameless Ration Heaters Onboard Commercial Aircraft, DOT/FAA/AR-TN06/18" 108: 2228: 1851: 1771: 1631: 1159: 796: 379: 1947: 1656: 1359: 1091: 1071: 146: 128: 44: 553: 2376: 2326: 2306: 2253: 1586: 1536: 1259: 1254: 913: 903: 878: 735: 710: 705: 700: 695: 100: 2346: 2208: 1736: 1051: 883: 2233: 2042: 1841: 1681: 1561: 1021: 740: 631: 66: 2427: 2398: 2361: 2321: 2173: 2082: 2047: 1997: 1882: 1591: 1461: 1431: 1369: 1106: 1006: 986: 981: 888: 789: 730: 116: 104: 73: 47: 165: 19: 2366: 2351: 2223: 2143: 2138: 2052: 2027: 2012: 1992: 1962: 1942: 1821: 1791: 1626: 1199: 1081: 1041: 923: 908: 863: 838: 263: 2422: 2381: 2371: 2188: 2017: 1972: 1932: 1922: 1786: 1701: 1481: 1379: 1274: 1249: 1164: 1116: 1061: 893: 858: 843: 828: 575: 275: 2341: 2336: 2316: 2238: 2158: 2113: 2077: 2032: 1967: 1937: 1691: 1676: 1581: 1476: 1374: 971: 868: 687: 656: 636: 259: 186:
reaction. Water oxidizes magnesium metal, according to the following chemical reaction:
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powders and table salt. When a meal pouch is placed in the bag and water is added, an
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The instructions advise that the heater should rest against a "rock or something"
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The research and development into a flameless ration heater began in 1973 by the
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MRE heaters that have not been properly activated must be disposed of as
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Ration heaters generate heat in an electron-transfer process called an
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Bell, William L.; Copeland, Robert J.; Shultz, Amy L. (January 2001).
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Oleksyk, Lauren E.; Pickard, Donald; Trottier, Robert (April 1993).
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U.S. Army Natick Research, Development, and Engineering Center
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Popper, Richard; Kalick, Joan; Jezior, Barbara (April 1991).
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adequately heat the meal, making the FRH cheaper overall.
344:"Evaluation of Alternative Concepts for Remote Feeding" 230:/CaO) and diphosphorous pentoxide with calcium oxide (P 69:
occurs which rapidly boils the water to heat the food.
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The United States Department of Transportation (DOT)
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(June 2006). 248:Federal Aviation Administration 2058:Radio-frequency identification 378:. Chem Matters. 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cutting 2006: 2004: 2001: 1999: 1996: 1994: 1991: 1989: 1988:Hermetic seal 1986: 1984: 1981: 1979: 1976: 1974: 1971: 1969: 1966: 1964: 1961: 1959: 1956: 1954: 1951: 1949: 1946: 1944: 1941: 1939: 1936: 1934: 1931: 1929: 1926: 1924: 1921: 1919: 1916: 1914: 1911: 1909: 1906: 1904: 1901: 1899: 1896: 1894: 1891: 1889: 1886: 1884: 1881: 1880: 1878: 1874: 1868: 1865: 1863: 1860: 1858: 1855: 1853: 1850: 1848: 1845: 1843: 1840: 1838: 1835: 1833: 1830: 1828: 1825: 1823: 1820: 1818: 1815: 1813: 1810: 1808: 1805: 1803: 1800: 1798: 1797:Security tape 1795: 1793: 1790: 1788: 1785: 1783: 1780: 1778: 1775: 1773: 1770: 1768: 1767:Polypropylene 1765: 1763: 1760: 1758: 1755: 1753: 1750: 1748: 1745: 1743: 1740: 1738: 1735: 1733: 1730: 1728: 1725: 1723: 1720: 1718: 1715: 1713: 1712:Packaging gas 1710: 1708: 1705: 1703: 1700: 1698: 1695: 1693: 1690: 1688: 1685: 1683: 1680: 1678: 1675: 1673: 1670: 1668: 1665: 1663: 1660: 1658: 1655: 1653: 1650: 1648: 1645: 1643: 1640: 1638: 1635: 1633: 1630: 1628: 1625: 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1216: 1213: 1211: 1208: 1206: 1203: 1201: 1198: 1196: 1193: 1191: 1188: 1186: 1183: 1181: 1178: 1176: 1173: 1171: 1168: 1166: 1163: 1161: 1158: 1157: 1155: 1153: 1149: 1143: 1140: 1138: 1135: 1133: 1130: 1128: 1125: 1123: 1120: 1118: 1115: 1113: 1110: 1108: 1105: 1103: 1100: 1098: 1095: 1093: 1090: 1088: 1085: 1083: 1080: 1078: 1075: 1073: 1070: 1068: 1065: 1063: 1060: 1058: 1055: 1053: 1050: 1048: 1045: 1043: 1040: 1038: 1035: 1033: 1030: 1028: 1025: 1023: 1020: 1018: 1015: 1013: 1010: 1008: 1005: 1003: 1000: 998: 995: 993: 990: 988: 985: 983: 980: 978: 975: 973: 970: 968: 965: 963: 960: 958: 955: 953: 950: 948: 945: 944: 942: 936: 930: 927: 925: 922: 920: 917: 915: 912: 910: 907: 905: 902: 900: 897: 895: 892: 890: 887: 885: 882: 880: 877: 875: 874:Package theft 872: 870: 867: 865: 862: 860: 857: 855: 854:Overpackaging 852: 850: 847: 845: 842: 840: 837: 835: 832: 830: 827: 826: 824: 818: 814: 807: 802: 800: 795: 793: 788: 787: 784: 772: 769: 768: 766: 762: 752: 749: 747: 744: 742: 739: 737: 734: 732: 729: 728: 726: 724: 720: 712: 709: 707: 704: 702: 699: 698: 697: 694: 693: 691: 689: 685: 682: 678: 673: 663: 660: 658: 655: 653: 650: 648: 645: 643: 642:Jungle ration 640: 638: 635: 633: 630: 628: 627:5-in-1 ration 625: 623: 620: 618: 615: 613: 610: 608: 605: 603: 600: 599: 597: 595: 591: 587: 583: 578: 559: 555: 549: 546: 533: 532: 524: 518: 515: 503: 496: 489: 487: 483: 467: 460: 457: 447: 441: 438: 428: 422: 419: 409: 403: 401: 397: 381: 374: 367: 365: 361: 345: 338: 335: 319: 312: 310: 308: 306: 304: 302: 300: 298: 296: 294: 292: 288: 281: 277: 274: 273: 269: 267: 265: 261: 253: 251: 249: 241: 239: 223: 219: 216: 215:galvanic cell 212: 207: 189: 188: 187: 185: 177: 175: 167: 160: 158: 156: 150: 148: 144: 138: 130: 126: 123: 118: 113: 110: 106: 102: 98: 93: 91: 87: 79: 77: 75: 70: 68: 64: 60: 55: 53: 49: 46: 45:U.S. military 42: 38: 34: 30: 21: 2288:Environment, 1903:Blow molding 1832:Stretch wrap 1762:Polyethylene 1752:Plastic wrap 1742:Plastic film 1727:Paper pallet 1662:Living hinge 1567:Coated paper 1447:Spray bottle 1427:Security bag 1420:Water sachet 1410:Salvage drum 1405:Retort pouch 1310:Glass bottle 1205:Blister pack 1170:Aluminum can 1137:Water bottle 1037:Gas cylinder 1012:Field ration 909:Shelf-stable 750: 746:Soldier Fuel 723:Field ration 562:. Retrieved 557: 548: 536:. Retrieved 529: 517: 505:. Retrieved 473:. Retrieved 459: 440: 421: 389:12 September 387:. Retrieved 380:the original 351:. Retrieved 337: 325:. Retrieved 257: 245: 224: 220: 208: 204: 181: 172: 151: 139: 135: 115:In 1986 the 114: 94: 83: 71: 56: 54:since 1993. 43:included in 36: 32: 28: 26: 2184:Heat sealer 2149:Case sealer 2023:Papermaking 1943:Die cutting 1908:Calendering 1812:Shrink wrap 1687:Molded pulp 1672:Meat diaper 1637:Kraft paper 1617:Foam peanut 1607:Double seam 1577:Coextrusion 1547:Bubble wrap 1527:Bail handle 1472:Thermal bag 1395:Plastic bag 1210:Boil-in-bag 1142:Wine bottle 1127:Spray paint 1082:Popcorn bag 1077:Oyster pail 962:Beer bottle 373:"Hot Meals" 211:electrolyte 2412:Categories 2264:Staple gun 2244:Palletizer 2134:Can seamer 2003:Lamination 1928:Converting 1817:Slip sheet 1732:Paperboard 1597:Cushioning 1557:Cellophane 1532:Bioplastic 1510:components 1497:Wooden box 1467:Tetra Brik 1390:Paper sack 1365:Multi-pack 1315:Gunny sack 1185:Bag-in-box 1152:Containers 1017:Flour sack 1002:Egg carton 977:Coffee bag 957:Banana box 899:Shelf life 652:MCI ration 647:LRP ration 564:16 October 538:16 October 475:8 February 353:6 February 327:6 February 282:References 194:O → Mg(OH) 37:MRE heater 2428:Packaging 2357:Recycling 2164:Drum pump 2107:Machinery 1958:Extrusion 1876:Processes 1847:Tear tape 1837:Susceptor 1827:Strapping 1782:Screw cap 1757:Polyester 1602:Desiccant 1506:Materials 1487:Unit load 1442:Skin pack 1385:Paper bag 1255:Clamshell 997:Drink can 929:Wrap rage 813:Packaging 213:, form a 147:food safe 117:U.S. Army 105:U.S. Navy 74:U.S. Army 59:magnesium 2290:post-use 2179:Heat gun 2129:Calender 2038:Printing 1867:Velostat 1862:Tinplate 1697:Overwrap 1622:Gel pack 1612:Flip-top 1517:Adhesive 1452:Squround 1355:Mesh bag 1340:Jerrycan 1285:Envelope 1225:Bulk box 1102:Sand bag 1067:Milk bag 1052:Juicebox 967:Box wine 940:packages 711:M Option 706:A Option 662:Mess kit 617:K-ration 612:D-ration 607:C-ration 270:See also 254:Disposal 122:trioxane 2423:Heaters 2013:Molding 1918:Coating 1913:Canning 1572:Coating 1562:Closure 1320:Inhaler 1175:Ampoule 1047:Growler 938:Product 820:General 584:of the 582:Rations 507:9 March 238:/CaO). 190:Mg + 2H 88:gel or 80:History 52:rations 2397:  2332:Litter 2174:Filler 1717:Pallet 1415:Sachet 1280:Endcap 1245:Carton 1240:Carboy 1215:Bottle 1195:Barrel 822:topics 452:  433:  414:  86:Sterno 50:(MRE) 1722:Paper 1642:Label 1542:BoPET 1265:Crate 764:Misc. 526:(PDF) 498:(PDF) 469:(PDF) 383:(PDF) 376:(PDF) 347:(PDF) 321:(PDF) 161:Usage 1552:Bung 1492:Vial 1482:Tube 1380:Pail 1275:Drum 1250:Chub 1235:Case 1230:Cage 566:2023 540:2023 509:2008 477:2024 391:2014 355:2024 329:2014 72:The 63:iron 61:and 1647:Lid 1508:and 1350:Keg 1345:Jug 1335:Jar 1220:Box 1190:Bag 198:+ H 99:in 33:FRH 2414:: 556:. 528:. 500:. 485:^ 399:^ 363:^ 290:^ 27:A 805:e 798:t 791:v 568:. 542:. 511:. 479:. 393:. 357:. 331:. 236:5 234:O 232:2 228:3 200:2 196:2 192:2 31:(

Index


self-heating food packaging
U.S. military
Meal, Ready-to-Eat
rations
magnesium
iron
exothermic reaction
U.S. Army
Sterno
portable stove
U.S. Army Natick Research, Development, and Engineering Center
Natick, Massachusetts
U.S. Navy
University of Cincinnati
U.S. Army
trioxane

high-density polyethylene
food safe
Operation Desert Storm

oxidation-reduction
electrolyte
galvanic cell
Federal Aviation Administration
hazardous waste
United States law
Active packaging

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