Corrugated fiberboard is a paper-based material consisting of a fluted corrugated sheet and one or two flat linerboards. It is widely used in the manufacture of corrugated boxes and shipping containers.

Plastic corrugated, which is usually formed by extrusion but may also be laminated from separate plys of high density plastic, is also available from Alta Max.

Corrugated is described by various designations depending on the application and specifier, but usually is identified by at least grade, class, variety, and flute.

Grade is a measure of strength and may be stacking strength (ECT grades) or burst strength (Mullens grades).

Class refers to protective properties such as weather resistance, water vapor resistance, and fire retardance. Alta Max stocks all classes including WR/WWVR classes such as V3C and W5C.

Variety refers to the number of fluted mediums in a sheet. The three most common varieties are SW (singlewall), DW (doublewall) and TW (triplewall). A singlewall sheet consists of two liners and one medium. Doublewall has two mediums and three liners, and so on.

Flute size refers to the number of flutes per lineal foot and result in the thickness of the finished material.  Measuring the number of flutes per lineal foot is a more reliable method of identifying flute size than measuring board thickness but the approximate thickness for singlewall flutes are:

1. A-Flute - 1/4"
2. B-Flute - 1/8"
3. C-Flute - 3/16"
4. E-Flute - 1/16"

Corrugated is available in 'kraft' or natural colored tan sheets, white, and other colors including decorative foil laminated sheets such as those used by bakeries. It can also be coated with a variety of functional coatings such as non-slip, fire retardancy, electrostatic, and water/weather resistance.

Alta Max works with all grades and specifications of corrugated – some examples include:

1. All classes and grades per ASTM-D4727 and ASTM-D5118.
2. All classes and grades per PPP-F-320 and PPP-B-636.
3. Fire retardant corrugated including domestic (D/FR) and weather-resistant fire-retardant (WR/FR)
4. Single faced, single-wall, double-wall, and triple-wall from any combination of flutes.
5. Static-protective and static-dissipative corrugated.
   

Please contact us today – we are excited to speak with you and learn about your specific needs!