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NMFC Item 222

SPECIFICATIONS FOR FIBREBOARD BOXES
CORRUGATED OR SOLID
(Also applies in connection with Items 222-1, 222-2, 222-3, 222-4, 222-5 and 222-6)

Sec. 1. Ratings or Classes That Apply When Fibreboard Boxes Conform To This Item:
(See Item 222-6 for explanation of terms.) Subject to provisions of Item 680, and unless otherwise provided in separate descriptions of articles, or in the Code of Federal Regulations (CFR), Title 49 for the shipment of hazardous materials, when the following requirements and specifications are complied with, ratings or classes applying on articles 'in boxes' will apply on the same articles in solid or corrugated fibreboard boxes described in this rule, all hereinafter referred to as fibre boxes, or as fibreboard boxes.
Use of 'Other Than Item 222' Boxes:
Where the separate descriptions of articles provide for the use of fibreboard boxes which are different from those provided for in this rule, such provisions will also apply to those articles in such boxes when commodity tariffs or exceptions to the Classification provide that such articles may be shipped 'in boxes' without further qualifications as to the construction of the boxes.
Fibreboard boxes need not comply with this Item nor is the circular box manufacturer's certificate required to be shown on such boxes (Item 222-1) when: (a) the article's descriptive item does not reference any method, form or specific packaging requirement, or (b) the term 'loose' or 'in packages' (Item 680, Sec. 5) is authorized, or (c) separate numbered packages are complied with and utilized, in which case a rectangular Package Certificate is required.
Otherwise, boxes not complying with this Item will be subject to the penalties defined within Item 687.
Sec. 2. Description of Fibreboard:
(a) CORRUGATED FIBREBOARD. Boxes must be made of singlewall, doublewall or triplewall corrugated fibreboard having proper bending qualities, the facings being firmly glued to the corrugated medium at all points of contact and the outer facing having water resistance.
(b) SOLID FIBREBOARD. Boxes may be made of 3 or more plies (See NOTE) of solid fibreboard having proper bending qualities, all plies being firmly glued together and outer ply being water resistant.
NOTE-- Boxes may be made of two-ply solid fibreboard when maximum weight of box and contents does not exceed 40 pounds. Boxes may be made of one-ply solid fibreboard when the maximum weight of box and contents does not exceed 10 pounds.
Sec. 3. Maximum Size and Weight-Minimum Fibreboard Requirements:
Boxes must comply with the burst or puncture test and other requirements of Table A; or alternatively, must comply with the edge crush test and other requirements of Table B (see Notes 2 and 4).




NOTE 1-TEST PROCEDURES:
(a) BURST TEST:
(1) Tests to determine compliance with the bursting test requirements of Table A must be conducted in accordance with Technical Association of the Pulp and Paper Industry (TAPPI), Official Test Method T-810.
(2) A minimum of six bursts must be made, three from each side of the board, and only one burst test will be permitted to fall below the specified minimum value. Board failing to pass the foregoing test will be accepted if in a retest consisting of 24 bursts, twelve from each side of the board, not more than four burst tests fall below the specified minimum value. Disregard nonsimultaneous bursts.
(b) PUNCTURE TEST:
(1) Tests to determine compliance with the puncture test requirements of Table A must be conducted in accordance with Technical Association of the Pulp and Paper Industry (TAPPI), Official Test Method T-803.
(2) A minimum of four puncture tests must be made and only one puncture test will be permitted to fall below the specified minimum value.
(c) EDGE CRUSH TEST:
(1) Tests to determine compliance with the edge crush requirements of Table B must be conducted in accordance with Technical Association of the Pulp and Paper Industry (TAPPI), Official Test Method T-811.
(2) A minimum of six tests must be made and only one test is permitted to fall below the specified minimum value, and that one test cannot fall below the specified minimum value by more than 10%. Board failing to pass the foregoing will be accepted if in a retest consisting of 24 tests, not more than four tests fall below the specified minimum value and none of those tests fall below the specified minimum value by more than 10%.
NOTE 2-FULL TELESCOPIC STYLE BOXES:
Singlewall full telescopic style boxes may have gross weight and united inches increased to those of doublewall boxes as shown in Tables A and B. For doublewall and triplewall full telescopic style boxes, allowable gross weights and united inches of Table A or B may be increased by 10 percent. Special packages are not affected by this provision.
NOTE 3-SIZE EXTENSION FORMULA:
If weight of box and contents is less than the maximum weights shown in Tables A and B, the maximum outside dimensions for the box may be increased half the percentage that the actual weight is less than the maximum weight allowed by the Table. For boxes made to comply with this Note the words 'Size Extension Formula' must be printed below the certificate required in Item 222-1(a).
NOTE 4-NUMBERED PACKAGES-ALTERNATE REQUIREMENTS:
Where numbered package descriptions specify boxes, containers, trays and component parts thereof to be made of corrugated fibreboard having a minimum bursting or puncture test as shown in Column A below, boxes, containers, trays and component parts thereof may be made of corrugated fibreboard having a minimum edge crush test as shown in Column B below. These alternate provisions will exempt basis weight requirements.



Sec. 4. Manufacturers' Joint:
The provisions of Sec. 4 also apply to joints effected on wrap-around blanks by processors other than blank manufacturers.
(a) SINGLEWALL OR DOUBLEWALL CORRUGATED FIBREBOARD:
Boxes must have manufacturers' joints formed by lapping the sides of the box forming the joint not less than 1 1/4 inches and fastening the joint by one of the following methods:
(1) With metal staples or stitches spaced not more than 2 1/2 inches apart, except that staples or stitches must be spaced not more than one inch apart when weight of box and contents is 140 pounds or more.
(2) By firmly gluing the joint throughout the entire area of contact with a water resistant adhesive.
(3) By fitting abutting edges forming joint close together and securing with sealing strips firmly glued to the box and extending the entire length of the joint. Sealing strips must be of sufficient strength that rupture of the joint occurs with fibre failure of one or more of the facings.
Sealing strips for boxes not exceeding 65 pounds gross weight or for two complete singlewall corrugated boxes must be not less than two inches wide and must be of not less than 60 pounds per 3,000 square feet basis weight and have a bursting strength of not less than 60 psi. Sealing strips may be reinforced with glass fibres or other natural or synthetic fibres.
Sealing strips for boxes exceeding 65 pounds gross weight, excepting two complete singlewall corrugated boxes, must be of two or more plies, not less than three inches wide, of not less than 150 pounds per 3,000 square feet basis weight and have a bursting strength of not less than 150 psi. Lesser basis weight is permissible if the sealing strips are reinforced with glass fibres or other natural or synthetic fibres. All plies must be firmly glued together.
(b) TRIPLEWALL CORRUGATED FIBREBOARD:
Boxes must have manufacturers' joints formed by one of the following methods:
(1) By lapping the sides of the box forming the joint not less than two inches and fastening the joint with metal staples or stitches spaced not more than one inch apart. Both sides of the joint must be crush-rolled in area of contact before stapling or stitching.
(2) By lapping the sides of the box forming the joint not less than three inches. The joint must be firmly glued with 100% glue coverage in the area of contact with glue, or adhesive which cannot be dissolved in water after the film application has been dried under pressure. Glued manufacturers' joints for triplewall must be suitable for the application in which the packaging is intended.
(c) SOLID FIBREBOARD:
Boxes must have manufacturers' joints formed by one of the following methods:
(1) By lapping the sides of the box forming the joint not less than 1 1/4 inches and fastening the joint with metal staples or stitches spaced not more than three inches apart. When length of joint exceeds 18 inches, staples or stitches must be spaced not more than 2 1/2 inches apart.
(2) By lapping the sides of the box forming the joint not less than two inches with extensions of the lap not less than three inches beyond the top and bottom score lines and firmly gluing the joint throughout the entire area of contact with a water resistant adhesive.
(3) By fitting abutting edges forming joint close together and securing with sealing strips firmly glued to the box and extending the entire length of the joint. Sealing strips must be of sufficient strength that rupture of the joint occurs with fibre failure of one or more of the facings.
Sec. 5. Articles Liable to Sifting or Leaking:
Articles liable to sifting or leakage, not in inner containers, must be so prepared within the box as to prevent sifting or leakage.
Sec. 6. Hand Holes, Ventilating Holes, Easy-Opening Devices, Perforations:
Provided the carrying ability of the box is not materially impaired:
1. Boxes may have hand holes or ventilation holes.
2. Boxes may have perforations, slits or slots, but not to be located closer than one inch to adjacent or parallel score lines, except as below.
3. Boxes containing rigid, self-supporting articles or inner containers may have score lines perforated providing the united inches (length, width and depth added) do not exceed 40 inches.
Sec. 7. Box Closure:
Unless otherwise provided, boxes must be securely closed. Method of closure must be of adequate strength and quantity so as to maintain boxes properly assembled and closed during transportation.
Self-locking closure systems, whereby fasteners or closing devices are not used, must be capable of successfully passing the performance requirements of ASTM D4169, Element A, Assurance Level II, or ISTA Project 1A drop test.