Specification met:
A-A-1507, chipboard sheet 
(Meets the following packaging codes)
HA = A-A-1507, chipboard sheet as a stiffener on one side of the item
HB = A-A-1507, chipboard sheet as a stiffener on both sides of item 
HD = A-A-1507, chipboard sheet used as pads, cells, die cuts or sleeves 
 
Click below to view the spec.
A-A-1507