21 x 12 x 12" Corrugated Boxes

200# TEST VS 32 ECT (EDGE CRUSH TEST):
 * 200# test: 30-50% stronger bursting strength.
              Recommended by UPS for shipping up to 40 lbs.
 * 32 ECT: Recommended by UPS for shipping up to 30 lbs.
Pound test refers to bursting strength:
 * 200# test boxes withstand 200 lbs/sq.in. of side wall
   pressure before bursting.
ECT refers to stacking strength:
 * 32 ECT boxes withstand 32 lbs/linear inch of stacking
   weight before crushing.
 * An alternative for lightweight shipments.

Closest equivalents:
 * 32 ECT - 200# test
 * 42 ECT - 200# test DW
 * 44 ECT - 275# test
 * 48 ECT - 275# test DW
 * 51 ECT - 350# test DW
 * 82 ECT - 600# test DW

BOX STRENGTH GUIDELINES: (Maximum weight per box)

                           FIBER BOX        UPS
                            HANDBOOK     GUIDELINES
   32 ECT Single Wall       65 lbs         30 lbs
   200# Single Wall         65 lbs         40 lbs
   275# Single Wall         95 lbs         65 lbs
   350# Single Wall        120 lbs         80 lbs
   200# Double Wall         80 lbs         60 lbs
   275# Double Wall        100 lbs         80 lbs
   350# Double Wall        120 lbs        100 lbs

GENERAL BOX SPECIFICATIONS AND REGULATIONS:
 * All boxes open along the length (first dimension).
 * Seams are glued.

FLUTE:
 * Definition: Wave shapes pressed into the middle of the
   corrugated wall of the box.  Most of Uline single wall
   boxes are C-flute.
 * Approximate thickness:
   A flute 3/16"
   C flute 9/64"
   B flute 3/32"
   E flute 3/64"

SPECIFICATIONS:
 * Meets ASTM D3951