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The most common box style is the Regular Slotted Container (RSC)

Board Grades

The strength of a corrugated box starts with its material. A corrugated sheet consists of two major components - linerboard and medium. Linerboard is the flat paper that covers both sides of the sheet and the medium is the "fluted" or arched paper found between both liners. The flute, when anchored to the linerboards with a starched-based adhesive (glue), resists bending and pressure from all directions.


Flutes come in five basic heights and shapes. Here at Caesar Pac we produce the following flutes:

  • F
  • E
  • B-Flute (used for die-cut boxes)
  • C-Flute (used for RSCs)
  • A



B-flute is compressed and appears thinner, but it is made with more paper to provide stronger side wall protection from blows and punctures. C-flute is taller, with more air space, but offers enhanced stacking strength. For excellent graphic reproduction, consider E-flute.


Board grades are a combination of 3-ply layer or 5-ply layer, the color has to be either white or brown.



Each board type is selected according to the specific use of the box, i.e. whether it will be stored in the fridge, what is the amount of storage load above it, etc…

The most effective way to choose a grade isn’t what the box will contain, but what will be stored above the box. That is why we have and use the compression test machine to determine the board grade you require for the optimal storage of your product.

Each different ply of paper type changes the type of board grade.

There are infinite board grades, to determine which board grade is best suited for you, our quality department & sales representative will arrange for a meeting with you to help determine which board grade is best for you.