(b) Cans not exceeding 1 gallon capacity may be made of metal lighter than 28 gage, but must be of adequate thickness.

(c) Each completed can must be sealed air-tight and leak proof, must be tested by its manufacturer with interior pressure, and must show no leakage." [Par. 1]

72.2B-2 Metal cans; 2B. Cans must comply with specification 2A, except that the metal in cans of capacity over 1 gallon must be not lighter than 30 gage, United States Standard (commercial 107-pound tin plate).*+ [Par. 2]

72.2C-3 Corrugated fiberboard cartons; 2C. Inside containers prescribed under this specification must be made and packed as follows:

(a) They must be (1) double-slide carton of double-wall corrugated fiberboard, or (2) triple-slide carton of double-faced corrugated fiberboard.

(b) Each slide must be in one piece with joint secured with cloth sealing tape at least 2 inches wide.

(c) Outside containers for the foregoing inside containers must be lined throughout with double-wall corrugated fiberboard.

(d) Partitions and pads of double-wall corrugated fiberboard must be used to separate each inside container from each adjoining one. (e) Strength, Mullen or Cady test, of all fiberboard prescribed must be at least 275 pounds for double-wall board and 175 pounds for double-faced board.*+ [Par. 3]

72.2D-4 Duplex paper bags; 2D. (a) Bags must be made with two separate sheets of paper testing 1 point or over, Mullen, per pound of weight; either No. 1 kraft bag-paper stock, or rope paper, containing 35 percent or more of Manila rope fiber. Rope paper is permitted to be of 15 percent lighter weight than kraft paper under the following table:

(b) The side seams of the two tubes must be staggered, thoroughly glued or pasted, and the tube must be so folded as to have a pleat in each side. The width of the side (pleat extended) must not be more than three-fourths the width of the face of the bag.

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**For statutory and source citations, see note to § 72.1A–1.

(c) The bottom must be formed in one of the following ways: (1) Pasted bottoms: The pasted bottom must be formed in the following way: First, the two sheets comprising the cut-off or lip must be firmly glued or pasted together at the bottom; second, the cut-off must be so designed as to expose to the glue or paste the inside of the cut-off or lip for the full width of the bag; third, the two sheets of the tube on the back of the bag must be pasted together near the bottom; fourth, the whole tube must be folded over as if a single sheet of paper and thoroughly sealed with adhesive-the whole comprising a sift-proof bag; or

(2) The two sheets must be thoroughly glued on both top and bottom; second, the bottom cut and folded as if one sheet; third, bottoms to be of the satchel type and an ample supply of glue or paste must be used to make the bottom tight against sifting; fourth, over the pasted bottom must be applied a patch or double bottom which will cover all exposed or cut edges of the paper. This patch must be of No. 1 kraft stock of 60-pound weight basis or heavier on bags for 12 pounds of contents or less, and of No. 1 kraft stock of 70-pound weight basis or heavier on bags for more than 12 pounds of contents.

(3) Bags with satchel bottoms, not provided with the reinforcing patch as described above. Both the inner and the outer bag bottoms shall be separately formed and so pasted as to give a siftless bag when tested as prescribed herein.

(4) Stapled bottoms: The bottom of the tube must be triple folded, with two folds on one side and one fold on the other, securely stapled through all folds in a manner to make it dust proof. The staples must not be more than three-fourths inch apart.

(5) Sewed buttons: The bottom of the tube must be triple folded, with two folds on one side and one fold on the other, and securely sewed through all folds and rendered entirely dust proof by dipping in sodium silicate to fill the holes of the stitches.

(d) Paper bags made of 5-ply, 60-pound No. 1 kraft paper stock, and with sewed bottoms, may be used as inside packages for contents weighing 25 pounds or less, provided the bags after filling and closing are capable of passing the drop test prescribed.

(e) Paper bags made of 5-ply, 60-pound No. 1 kraft paper stock, and with satchel-pasted bottoms, may be used as inside packages for contents weighing 25 pounds or less, provided the bags, after filling and closing are capable of passing the drop test prescribed.

(f) The tops of the bags must be closed after filling by either stapling or sewing, as specified above for the closing of the bottoms, or by machine sewing with filler cord and with crepe kraft tape over the mouth of the bag. [As amended Mar. 15, 1938, effective June 17, 1938, 3 F.R. 653]*+~ [Par. 4]

72.2E-5 Kits and pails; 2E. Containers must be of wooden or metal construction not over 10 gallons capacity each. Metal containers over 1 gallon capacity each must be made of metal not less than 30 gage, United States Standard." [Par. 5]

**For statutory and source citations, see note to § 72.1A-1.

Page 729

[729]

72.2F-6 Metal containers and liners; 2F. Containers exceeding 1 gallon capacity and metal box lining must be constructed of metal not lighter than 30 gage, United States Standard (commercial 107pound tin plate) and must be sealed leak proof.*+ [Par. 6]

72.2G-7 Fiber cans and boxes; 2G. (a) Fiber cans with metal tops and bottoms must have tops and bottoms an integral part of the container; rectangular or square all-fiber containers must have tops and bottoms thoroughly glued. Construction must comply with the following:

Material for fiber containers of 1 pound or less capacity, must be at least 0.026 inch thick in all parts; over 1 pound up to 3 pounds capacity, at least 0.036 inch thick; above 3 pounds, maximum 5 pounds, at least 0.05 inch thick. Jute board containers of 5 pounds or less capacity, at least 0.028 inch thick and 250 pounds test, Mullen or Cady. Chipboard rectangular or square all-fiber containers of 5 pounds or less capacity, at least 0.036 inch thick and 90 pounds test, Mullen or Cady. Chipboard containers shall be tightly wrapped with 60-pound No. 1 kraft paper fully pasted or glued thereon.

(b) Cylindrical all-fiber containers must have tops and bottoms thoroughly glued and must comply with the following:

(1) Material for containers of 1 pound or less capacity: Body (tube) at least 0.039 inch thick; top and bottom at least 0.026 inch thick, except for 14-pound containers, 0.021 inch thick.

(2) Material for containers over 1 pound up to 3 pounds capacity: Body (tube) at least 0.039 inch thick; top and bottom at least 0.036 inch thick.

(3) Material for containers over 3 pounds, maximum 5 pounds, capacity: Body (tube) at least 0.060 inch thick; top and bottom double manila pulp or sheet-lined strawboard at least 0.036 inch thick and 130 test, Mullen or Cady.*+ [Par. 7]

72.2H-8 Cartons; 2H. Cartons shall be made of double-face corrugated fiberboard testing at least 175 pounds, Mullen or Cady. Regular slotted, double-slide, or triple-slide types are authorized. All joints must be secured with glued cloth sealing tape.*+ [Par. 8] 72.2J-9 Paper-bag lining; 2J. (a) Paper bag lining shall be as follows:

(b) Paper must be No. 1 duplex, waterproof, crinkled paper, consisting of two sheets of No. 1 kraft paper, each 30 pounds or more per ream, cemented together with sufficient asphaltum so that the finished product shall be 90 pounds or more per ream.

(c) Paper when crimped must be impervious to water at 80° F. Test for imperviousness shall consist of folding paper into cones and filling with water at 80° F. to a depth of 2 inches. No water shall come through an acceptable paper within 24 hours.

(d) Paper must be crimped or crêped parallel to axis of bag, and such that paper will stretch 25 percent or more without tearing.

(e) Bags must be so constructed that when filled they will conform to interior surface of outside containers and fit the sides without stretching.

Page 730

*For statutory and source citations, see note to § 72.1A-1.

(f) Bag seam shall be turned over at least three-fourths inch and stitched midway between inner and outer edges. Stitches must be one-third inch or less in length.

(g) Bags must be of sufficient length so that when placed in the container, filled to capacity of container, and closed by tying, 3 inches or more of bag will extend above the tie.

(h) Closure of bags must be by sewing, tying, or stapling, made secure against sifting of contents.** [Par. 9] 72.2K-10 Paper-bag lining; 2K. Bags as liners for wooden kits must be constructed of No. 1 kraft paper, 45 pounds or more per ream (500 sheets 24 by 36 inches). Paper shall be crimped and conform to interior surface of kit when contents is inserted. Closure shall be made secure and sift proof by sewing, tying, or stapling.** [Par. 10]

72.2L-11 Paraffined-paper lining; 2L. (a) Box lining of strong paraffined paper must be without joints or other openings at the bottom or at sides of box, and shall fully protect contents in contact with top of box.

(b) Tensile strength of paper must be at least 35 pounds with the grain and 17 pounds across grain, tested by direct pull on strips measuring 3 inches by 1 inch. Average results of three or more tests with the grain and three or more across grain shall be used.

(c) Paper shall be impervious to water and nitroglycerin at 77° F. Test for imperviousness shall consist of folding paper into cones, loosely to avoid breakage at creases. Cones tested for nitroglycerin shall be filled to 1 inch depth; those for water to 2 inches. No leakage of liquid shall occur during 24 hours' exposure.

(d) Paper must transmit no oily or greasy stain to unglazed paper. Test shall consist of placing one thickness of paraffin-saturated paper, with two thicknesses of unglazed paper on each side, in an oven at 104° F. for 24 hours, under pressure of a lead disk 11⁄2 inches thick and of 10 pounds weight resting edgewise on the paper.

(e) Saturating paraffin shall have melting point of 125° F. or above. Test shall consist of extracting paraffin from 1 ounce or more of paper with ether. After evaporation of all ether, paraffin shall be melted and poured upon the surface of water contained in a hemispherical dish approximately 334 inches in diameter. Dish shall be three-fourths full of water above melting point of paraffin. Thermometer shall be placed with bulb three-fourths immersed in center of dish. Water and paraffin shall be allowed to cool until paraffin upon the surface of water commences to solidify. Temperature shall then be read and recorded as melting point of paraffin.*+ [Par. 11] 72.2M-12 Waterproofed-paper lining; 2M. Waterproofed paper for box lining must be strong, folded or constructed without joints or openings at sides, bottoms, or ends, and shall fully protect contents at top of box.** [Par. 12]

72.2N-13 Metal cans; 2N. (a) Cans must be not over 6 inches diameter, or 13 inches long, or 14 pounds water capacity (388 cubic inches).

**For statutory and source citations, see note to § 72.1A-1.

Page 731

(b) Material must consist of tin plate of good quality, and dimensions must conform to the following:

(c) Side seams must have at least 1/4-inch lap soldered, or be a lock seam soldered. Head seams must be lined with a suitable material and must be actual double seams.

(d) The completed can must have its outer surface protected against rust by the use of enamel or lacquer.

(e) The can, when closed as for shipment, must be capable of standing a 40-pound interior pressure without leakage.*t [Par. 13]

SHIPPING CONTAINER SPECIFICATION 3A

SEAMLESS STEEL CYLINDERS

72.3A-1 General. (a) Purchasers are permitted to impose additional requirements not inconsistent with these specifications.

(b) For cylinders made in foreign countries, a chemical analysis of material and all tests as specified must be carried out within the limits of the United States under the supervision of a competent and disinterested inspector.*+ [Pars. 1,2]

72.3A-2 Inspection. (a) Purchaser must provide for inspection by a competent and disinterested inspector.

(b) Inspector must carefully inspect all material and reject that not complying with § 72.3A-3. Inspector must stamp his official mark on each plate and billet accepted by him for use in making hot-drawn cylinders and must verify the proper application of heat numbers to such material by occasional inspections at the rolling mill.

(c) Inspector must verify chemical analysis of each heat of material by analysis or by obtaining certified chemical analysis: Provided, That for seamless tubing, or for plates for cold-drawn cylinders, a certificate from the manufacturer thereof, giving sufficient data to indicate compliance with these specifications, may be accepted when verified by check analysis of samples taken from one cylinder out of each lot of 200 cylinders or less.

(d) Inspector must fully verify compliance with specifications, inspect all billets after nick and cold break operation, verify heat treatment of the cylinder as proper, obtain samples for all tests and check chemical analysis, witness all tests, and report volumetric

Page 732

*For statutory and source citations, see note to § 72.1A-1.