Corrugated Materials

GRETO offers various types of corrugated items:

Corrugated Regular Slotted Carton:

All flaps are the same depth, and the two outer flaps are one-half the container’s width so that they meet at the center of the box when folded. The regular slotted container (RSC) can be used for most products, and is the most common box style.

Corrugated Overlap Slotted Carton:

All flaps are the same depth, and the outer flaps overlay by one inch or more. This style of container is used when the length of the box is considerably greater than the width, resulting in a long gap between inner flaps.

Full-Overlap Slotted Packaging Carton:

All flaps are the same depth, and their depth equals the width of the box. When closed, the outer flaps come within one inch of complete overlap. The style is especially resistant to rough handling.

Corrugated One-Piece Folder Boxes:

One piece of board is cut so that it provides a flat bottom, with flaps forming the sides and ends, and extensions of the side flaps meeting to form the top. One, two, and three-piece folders are used for books and other items shipped in a single unit. 

Corrugated Two-Piece Folder Boxes:

Two rectangular scored pieces provide a double unbroken layer for the bottom, and a double layer for the top. Flaps of one piece form the sides, and flaps of the second piece form the ends.

Corrugated Self-Locking Five-Panel Folder Boxes:

A single cut and scored piece features a fifth panel used as the closing flap, completely covering a side panel. The closed box has several thicknesses in each end, providing stacking strength and protection for long articles of small diameter, which might be damaged, or damage the box, if pushed through ends.

GRETO also supplies corrugated pads:

Single Face Corrugated:

A corrugated medium with a linerboard facing adhered to one side. It can be manufactured in sheets or rolls. Single face is principally used as a wrapping material, and occasionally for interior packing or padding.

Single Wall Corrugated:

A corrugated medium with a linerboard adhered to both sides. It is also referred to as “Double Face.” This popular and versatile 3-ply construction is converted into a wide variety of containers and packaging components.

Double Wall Corrugated:

Two corrugated mediums with a linerboard facing adhered between them and to both sides. This 5-ply construction is most applicable for packing heavy items where high rigidity and protection is required.

Triple Wall Corrugated:

Three corrugated mediums and four linerboard facings. This 7-ply construction is used where large container sizes are involved, such as pallet packs.

GRETO provides flutes, wave shaped cardboard material that makes up a board’s corrugation. Larger flutes provide greater strength and cushioning, while smaller flutes have better printability and foldability.


The highest flute size, and when combined with an inner and outer facing is the thickest. There are 36 flutes to a foot. 


This flute has lower arch heights than the A-flute and more flutes per foot, being 50 flutes per foot. There are 49 flutes to a foot. 


The C-flute is thinner than the A-flute but thicker than the B-flute. An estimated 80% of today’s corrugate is made of C-flute board. There are 41 flutes to a foot.


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