so located that bolts fastening them to side of barrel will pass through stave and not between two staves. Holes bored for bolts should afford a driving fit to eliminate leakage.*+

72.35-6 Marking. Each barrel must be plainly and permanently marked on top of head with hot branding irons, in letters and figures not less than 34-inch high, as follows:

(a) ICC-35. This mark shall be understood to certify that the barrel complies with all specification requirements.

(b) Date of manufacture (month-year).

8 Initials or symbol of manufacturer. This must be recorded

with the Bureau of Explosives, 30 Vesey Street, New York City.** 72.35-7 Second-hand packages. Containers used more than once must be thoroughly inspected and recoopered and repaired when necessary. Badly bulged or warped staves or heads must be replaced.*†

SHIPPING CONTAINER SPECIFICATION 36A

TRIPLEX BAGS

72.36A-1 Maximum capacity. Maximum permitted net weight of shipment in this bag is 100 pounds.*t [Par. 1]

72.36A-2 Construction. (a) Bags must conform to one of the following types:

(1) Osnaburg cotton cloth weighing at least 812 ounces per square yard, lined with two sheets, each of No. 1 kraft crêped paper weighing 35 pounds or more per ream, cemented together with asphaltum and cemented to Osnaburg bag. Complete bag must have tensile strength not less than warp 100 pounds, fill 100 pounds. Bag must be securely sewn at bottom and side seams dust-tight. After filling, bag must be securely fastened by double tying with steel wires of No. 16 Birmingham wire gage, or heavier.

(2) Three separate bags, one within another, not cemented together. Inner bag must be made of crimped or crêped No. 1 kraft paper, weighing 45 pounds or more per ream. This bag must be placed within crimped duplex bag made of two sheets, each of No. 1 kraft paper, weighing at least 30 pounds per ream, cemented together with sufficient asphaltum to produce a weight of at least 90 pounds per ream. Duplex bags must be placed in Osnaburg cotton cloth bag of weight specified in paragraph (a) (1). Seams must be secure and dust-tight. After filling, inner bags must be closed by rolling edges down and cloth bag must be fastened as prescribed in paragraph (a) (1).

(b) In filling bags, care must be taken to prevent contents from getting on the outside thereof.

(c) The finished package must be capable of withstanding drop test of 4 feet without sifting of contents.** [Pars. 2-4]

72.36A-3 Marking. Each bag must be plainly marked, by print

ing in letters and figures at least 1 inch high, as follows:

(a) ICC-36A. This mark shall be understood to certify that the bag complies with all specification requirements.

(b) Name and address of manufacturer.*+ [Par. 5]

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

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SHIPPING CONTAINER SPECIFICATION 36B

LINED BURLAP BAGS

72.36B-1 Maximum capacity. Maximum permitted net weight of shipment in this bag is 100 pounds.*+ [Par. 1, as amended Nov. 1, 1934]

72.36B-2 Construction. (a) Bags must be made of 12-ounce, or heavier, burlap with inner liners consisting of 2 sheets of No. 1 kraft creped paper cemented together and cemented to the burlap, and must conform to the following:

(1) Burlap must be at least equal in quality and strength to burlap commercially known as 12-ounce, 40-inch (12/40), burlap, Calcutta  and/or B mill grade. Count must be at rate of porter 11 threads per 37/40 inch, and shot 12 threads per inch. All counts are to be made on the average of 6 unit counts in each of the porter and the shot.

(2) Each liner before creping must be of No. 1 kraft paper with basis weight of at least 25 pounds per ream (480 sheets, 24 by 36 inches).

(3) The stretch of the paper liners after they are cemented to the burlap must equal the stretch of the burlap in the direction of the warp and the filling, and must be equal to 10 percent in a direction diagonal to the warp and the filling.

(4) The adhesive between the two plies of paper must be asphalt of approximately 150° F. melting point and must be evenly coated over the entire area of paper at the minimum rate of 110 pounds per ream of paper after creping.

The adhesive between the paper and the burlap must be either:

(i) Curing rubber latex evenly distributed over the entire area of the paper, after creping, at a minimum rate of 40 pounds, dry weight, of rubber per ream of paper.

(ii) Asphalt of any desirable type, evenly distributed over the entire area of the paper, after creping, at a minimum rate of 110 pounds of asphalt per ream.

(5) All seams must be pasted with curing rubber latex and must overlap 1 inch; or, if taped, the tape must overlap at least 1 inch on both sides of the abutted edges. All seams and closures shall be joined so as to cause the burlap faces of the bag material to be cemented to each other. The tapped top and bottom closures must overhang onehalf inch beyond each side of the bag mouth and be securely cemented together to eliminate any sifting. All tape must be of the same construction as the bag body material, or of a type at least equal in strength and stretch. The strength of all seams must be at least equal to the strength of the bag material.

(b) The bag material and all seams and the closure must be sift proof. In filling bags, care must be taken to prevent the material shipped from getting on the outside thereof.

(c) Bags are to be closed with tape at least 23/4 inches wide, of type described in paragraph (a) (5), and cemented with curing rubber latex in the manner described in paragraph (a) (5). Bags may be cemented closed by any other method, or by the use of any other adhesive, which can be demonstrated by tests to be equally effective.

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

Tensile strength of closure must be at least equal to tensile strength of bag material.

(d) The finished package must be capable of withstanding one 4-foot drop on the butt without causing sifting of contents or rupture of burlap or liners.*† [Pars. 2-5, as amended Nov. 1, 1934]

72.36B-3 Marking. Each bag must be plainly marked by printing in letters and figures at least 1 inch high, as follows:

(a) ICC 36B. This mark must be understood to certify that the bag complies with all specification requirements.

(b) Name and address of bag manufacturer.* [Par. 6, as amended Nov. 1, 1934]

SHIPPING CONTAINER SPECIFICATION 42B

ALUMINUM DRUMS

72.42B-1 Maximum capacity; material. (a) Containers must be of at least 5-gallon capacity. [As amended Jan. 13, 1934]

(b) Body and heads of aluminum at least 99 percent pure, or an aluminum base alloy of equivalent corrosion resistance and physical properties. [As amended July 23, 1935]*+ [Pars. 1, 2]

72.42B-2 Construction—(a) Outage. Two percent of rated_capacity, plus a maximum tolerance of 1 quart. [As amended Jan. 13, 19341

(b) Seams. Welded, including attachment of flanges for closures and other devices. Circumferential seams at least 3 inches from top of chime; chime seams not permitted. [As amended Jan. 13, 1934] (c) Rolling hoops and thickness of metal. (1) As follows:

(2) Rolling hoops must be firmly secured in place and not over 19 inches apart; bearing under hoops not permitted. [As amended Jan. 13, 1934]

(d) Closures. (1) Of screw-thread type or secured by screwthread device; openings over 2.3 inches not authorized; suitable gaskets required. [As amended Jan. 13, 1934]

(2) Threaded plugs, or caps, and flanges must be close fitting with gasket surfaces which bear squarely on each other when without

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

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gasket; they must have not over eight threads per inch, with five complete threads engaged when gasket is in place, or not over four threads per inch, with two complete threads similarly engaged; two 516-inch drainage holes are authorized in flange. Thread form shall be similar to that shown by drawing in specification 5A. [As amended Nov. 1, 1934]

(e) Projections. Closing devices and other parts must not project beyond chime or rolling hoops. [As amended Jan. 13, 1934]** [Pars. 3-7]

72.42B-3 Marking. (a) By embossing with raised marks on top head, or plate attached by welding, as follows:

* *

(1) ICC * the stars to be replaced by specification number under which container was made (for example, ICC-42B, ICC42C, etc.).

This mark shall be understood to certify that the container complies with all specification requirements.

(2) Gage of metal, Brown and Sharp, in thinnest part; rated capacity in gallons; year of manufacture (for example, 5-55-32).

(3) Manufacturer's mark: This must be registered with the Bureau of Explosives, 30 Vesey Street, New York City.

(b) Prescribed marks must be at least one-half inch high for 30 gallon and smaller containers, three-fourths inch for over 30 and not over 55 gallons, and 1 inch for over 55 gallons.*+ [Pars. 8, 9, as amended Jan, 13, 1934]

72.42B-4 Tests. (a) The type of container, closed as for use, must be capable of withstanding without leakage the type tests prescribed. These tests must be made, by any company starting production, on samples taken at random of each type and size of container, and must be repeated every 4 months or less during production; samples last tested must be retained until further tests are made. Type tests are as follows:

(1) Test by dropping of container filled with water to 98 percent capacity, from height of 6 feet onto solid concrete so as to strike diagonally on chime; also additional test on any other parts which might be considered weaker than the chime.

(2) Hydrostatic pressure test of 60 pounds per square inch sustained for 5 minutes.

(b) Each container must be tested, either under water or with all seams covered with soapsuds or heavy oil, by interior air pressure of at least 15 pounds per square inch. Containers must be carefully examined while under pressure and must withstand test without leaking.*+ [Pars. 10, 11, as amended Jan. 13, 1934]

SHIPPING CONTAINER SPECIFICATION 42C

ALUMINUM DRUMS

72.42C-1 Compliance with specification 42B; exceptions. (a) Containers must comply with all provisions of specification 42B except as follows:

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

(b) In place of table, § 72.42B-2 (c) (1), the following:

72.42D-1 Compliance with specification 42B; exceptions. (a) Containers must comply with all provisions of specification 42B except as follows: [As amended Jan. 13, 1934]

(b) In place of table, § 72.42B-2 (c) (1), the following:

(c) Vented closing devices of type approved by the Bureau of Explosives are authorized when specified by the purchaser. [As amended Nov. 1, 1934]

(d) Distance of drop, under the conditions of § 72.42B-4 (a) (1), is 4 feet. [As amended Jan. 13, 1934]

(e) Hydrostatic pressure, under the conditions of § 72.42B-4 (a) (2), is 40 pounds. [As amended Jan. 13, 1934]

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

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