Class Code: 4771

Per NCCI's Scopes Code Description:

Code 4771 is applied to employers that load bags with propellants such as black powder or smokeless powder. These bag propelling charges are used by other entities that load ammunition or many types of shell cases. Employers that load bags usually receive gun powders and bags from others. Code 4771 does include bag manufacturing in conjunction with Code 4771 operations, provided that the bag manufacturing takes place within an area exposed to gun powder. A separate bag manufacturing classification may be assigned to these operations if the conditions of Basic Manual Rule 1-D-3 are met. The loading operations are usually performed in small rooms with thick concrete walls and light glass doors opening to the outside. A limited number of persons may work in a room at any one time with only a small amount of powder. When three are allowed, they may work as follows: one fills cups with the powder and weighs the charges; the second checks the weight and pours the charges into bags; and the third closes the bags on a sewing machine. The filled bags are passed through chutes onto trucks, which move them to a packing area and storage prior to shipping. By analogy, the loading of ignition boosters is also assigned to Code 4771. These boosters are components for certain propellant charges used in shell case loading. The component is in the form of a small paper tube, received from others, which is loaded with smokeless powder.

Code 4771 is applied to employers that manufacture high explosives such as those enumerated in this classification’s footnote. Broad terms such as “fulminates” and “picrates” are used to describe materials used in the manufacturing process. Nitrocellulose blended with nitroglycerin to produce rocket powders (double-base powders) is assigned to this classification. Ingredients such as toluene, nitrotoluene, nitrocellulose, phenol, glycerol, diethylene glycol dinitrate, calcium carbonate, wood pulp, paraffin and sawdust are received from others. Employers that manufacture high explosives usually manufacture their own nitric and sulphuric acids and other chemical additives. Also, the recovery of chemicals from spent acids or solutions which are drawn off at various stages of high explosive manufacturing operations is included in Code 4771. High explosives, nearly all of which are products of nitration, employ nitric acid of a very strong concentration. Dinitrotoluol involves nitration of toluene with nitric and sulphuric acid. Picric acid involves nitration of phenolsulfonic acid obtained by heating phenol with concentrated sulphuric acid. The particular high explosives, after nitration, are separated by filtration, washed to remove any remaining acid, dried, ground, blended, screened and packed in sacks, kegs or fiber drums. Nitroglycerin is derived by dropping glycerol through cooled mixed acid and stirring, followed by repeated washing with water. The nitroglycerin is then poured into tin cans. Nitroglycerin is the principal explosive ingredient in dynamite. Diethylene glycol dinitrate, which is also an explosive, is often added as a freezing point depressant along with a dope such as wood pulp and an antacid such as calcium carbonate. The mixture is poured into paper shells after which the open end is rolled and crimped shut. The finished sticks are then immersed in hot paraffin, drained and packed into cases containing sawdust.

Code 4771 is applied to employers that manufacture smokeless powder and includes the manufacture of pyro- or nitro-cotton. The inclusion of the manufacture of pyro- or nitro-cotton serves as a basis for distinguishing between commercial pyroxylin, which has a nitrogen content of less than 12.5%, and the more highly nitrated products which serve as the base of smokeless powders.

Code 4771 further includes the manufacture of nitric and sulphuric acid and other chemical additives, provided that the production of the particular chemical or acid goes into the making of smokeless powder. Diphenylamine, which is a stabilizer, is usually produced by smokeless powder manufacturers. Nitrocellulose, waste cotton and cotton wool, received from others, are treated with highly concentrated nitric acid followed by washing, digesting and boiling. Diphenylamine is added to the nitro-cotton along with the dehydrating alcohol before going to the preliminary blocking press. The block of nitro-cotton, as it comes from the press, is torn apart in a breaker. The fragments are then mixed, pressed again, extruded, cut and taken in covered containers to a solvent recovery area where the alcohol is driven off by heat and recovered. The powder is then blended and poured into kegs or cans.

Code 4771 is applied to employers that load shell cases of 20mm and over with loose or bagged powder received from others. It is a common practice in shell case loading plants to load 20mm cannon shell cases on the same loading line used for loading 37mm shell cases since the loading of both types of cases is identical. Shell cases, loaded projectiles, loaded igniter boosters and loaded primers are received from others. The powder is weighed and filled or packed into the shell cases. In some instances, an igniter booster may be used for certain propellant charges. The assembly of the loaded shell cases with loaded projectiles and loaded primers is also included in this classification.

Code 4771 also is applied to employers that charge cartridges or load ammunition for small arms up to and including .50 caliber rounds for machine guns. Refer to Code 4766 for these operations in AL, AZ, ID and IN. The classification includes all operations involving the handling of explosives or mixing of fulminate. Cartridge components, brass-butted paper shells, charges such as smokeless powder and fulminate and loaded percussion caps are received from others. The charges are determined, weighed and mixed. The material is then filled or packed into cartridges and assembled with percussion caps.

The loading of shell-type boosters also is included in this classification. The component is in the form of a brass-butted paper shell. Such shells are loaded with smokeless powder and assembled with percussion caps. These boosters are used for lobbing gas and explosive bombs for trench mortars.

Code 4771 is applied to employers that load projectiles, bombs, mines or grenades. This operation involves the use of explosives such as amatol, TNT, double-base powders and other high explosives, which are received from others along with projectiles or shells, and loaded primers, fuses, boosters or detonators. The particular explosive is melted and poured into the projectiles and allowed to solidify. A hole is then bored into the solid charge to form a pocket for the loaded component, e.g., boosters, primers, fuses or detonators, whose function is to detonate the principal charge in the particular projectile, bomb, mine or grenade.

Code 4771 is applied to employers that assemble caps, primers, fuses, boosters or detonators including the mixing of charges or loading. All components are received from others along with initiating explosive charges such as lead azide, black powder and tetryl, which may be received in metal or paper containers, or the charges may be received in bulk and stored in specially constructed buildings or magazines. The operations involve the loading of the components, staking the detonators into the fuse assemblies, and attaching primers. In some cases, adapters and boosters are involved. If the charges are received in bulk, usually a day’s supply is delivered from the magazine and placed in a vault to be distributed as required in the assembly room. The particular charge is mixed, weighed and, in some cases, may be compressed into pellets. The material is then filled or packed into the particular device being loaded. Sealing discs are inserted and the units are crimped and then packed for shipment.

Code 4771 also is applied to employers that manufacture fireworks. Refer to Code 4761 for fireworks manufacturing in CO. No distinction is made as to the type of fireworks. This classification applies to the manufacture of military pyrotechnics such as flares, star shells, rockets and signals and includes the mixing of pyrotechnic and incendiary powders. Barium nitrate, strontium nitrate, electrolytic copper dust, potassium perchlorate, powdered magnesium, black powder and linseed oil are received from others along with components such as metal and cardboard tubes, aluminum cylinders, main parachutes, small pilot parachutes, umbrellas of spun colored glass, sheet steel carrying shells, wax and glue. The operations involve mixing (where powdered magnesium is used, it must be coated with linseed oil prior to compound production), repeated screening, drying, blending and aging. The particular composition is then automatically weighed into pellet charges, which pass through continuous presses in which the charge is pressed into aluminum cups. The pyrotechnic pellet then passes to assembly operations to be combined with the particular device that forms the completed unit.

The manufacture of slow-burning railroad fuses and highway flares does not fall within the scope of this classification. However, railroad torpedoes and magnesium flares for aerial photography work are assigned to Code 4771.

Code 4771 is applied to employers that manufacture black powder and mixtures in which black powder is the principal ingredient. Sodium nitrate or saltpeter, sulphur and charcoal, received from others, are mixed, ground, screened and blended in varying proportions. The powder, either mealed, superfine grain, fine grain, large grain or mammoth is filled into kegs, special fiber containers or tin cans.

Rate per $100. of Renumeration: $ 1.66

Construction Exemption Required: No