20 x 20 x 4" Corrugated Boxes

200 LB TEST VS 32 ECT (EDGE CRUSH TEST):
Compared to their closest ECT equivalent, # test boxes have:
 * Overall stronger/thicker box.
 * Greater stacking strength.
 * Up to 30% more bursting strength.
Pound test refers to bursting strength:
 * True & more consistent paper/box weight.
 * Much greater side wall strength.
ECT refers to stacking strength:
 * Overall lighter box.
 * Tendency to show fluting through the liner.

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
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.
 * Recycled Material:
   Liner: 42lb paper, 20-30% recycled material
   C Flute: Medium 26 lb paper, 100% recycled material

FLUTE:
 * Definition: Wave shapes pressed into the middle of the
   corrugated wall of the box.  Most of Uline 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