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Natural (Brown) Kraft Linerboard

Natural Cardboard provides the perfect surface for an organic look. Made from 80% virgin wood fibre, Natural cardboard is 100% recyclable and biodegradable.

  • Recyclable and biodegradable
  • Available in different flutes
  • Organic texture
  • Overview

    Natural kraft board is made up of 80% virgin pulp fibre, making it up to 100% recyclable and biodegradable. This material is brown in color and offers optimal durability as well as tear and dust resistance, making it ideal for packaging products for shipping. Natural Kraft boards are in fact the industry standard for producing corrugated packaging, making this material readily available and fairly cost effective to produce. However, the brown color of this material may alter printing output to appear more muted or faded. Although, bleached white or Kemi white liner boards tend to be a little more costly, if your brand requires vibrant designs, considering the extra cost may be worth while.

    Corrugated Board Process

    Corrugated Board Process

    Flute Types & Formation

    Flute Types
    Flute Types
    Corrugated Formation
    Corrugated Formation

    Corrugated Board Performance

    Single Wall

    Min. Burst Strength
    (lbs/sq in)
    Min. Edge Crust Test
    (lbs/in)
    Min. Combined Weight of Facings
    (lbs/m sq ft)
    Max Weight of Box and Contents
    (lbs)
    Max Outside Dimensions
    (L + W + D in)
    125 lbs/sq in 23 lbs/in 52 lbs/m sq ft 20 lbs 40 in
    150 lbs/sq in 26 lbs/in 66 lbs/m sq ft 35 lbs 50 in
    175 lbs/sq in 29 lbs/in 75 lbs/m sq ft 50 lbs 60 in
    200 lbs/sq in 32 lbs/in 84 lbs/m sq ft 65 lbs 75 in
    250 lbs/sq in 40 lbs/in 111 lbs/m sq ft 80 lbs 85 in
    275 lbs/sq in 44 lbs/in 138 lbs/m sq ft 95 lbs 95 in
    350 lbs/sq in 55 lbs/in 180 lbs/m sq ft 120 lbs 105 in

    Double Wall

    Min. Burst Strength
    (lbs/sq in)
    Min. Edge Crust Test
    (lbs/in)
    Min. Combined Weight of Facings
    (lbs/m sq ft)
    Max Weight of Box and Contents
    (lbs)
    Max Outside Dimensions
    (L + W + D in)
    200 lbs/sq in 42 lbs/in 92 lbs/m sq ft 80 lbs 85 in
    275 lbs/sq in 48 lbs/in 110 lbs/m sq ft 100 lbs 95 in
    350 lbs/sq in 51 lbs/in 126 lbs/m sq ft 120 lbs 105 in
    400 lbs/sq in 61 lbs/in 180 lbs/m sq ft 140 lbs 110 in
    500 lbs/sq in 71 lbs/in 222 lbs/m sq ft 160 lbs 115 in
    600 lbs/sq in 82 lbs/in 270 lbs/m sq ft 180 lbs 120 in

    Triple Wall

    Min. Burst Strength
    (lbs/sq in)
    Min. Edge Crust Test
    (lbs/in)
    Min. Combined Weight of Facings
    (lbs/m sq ft)
    Max Weight of Box and Contents
    (lbs)
    Max Outside Dimensions
    (L + W + D in)
    700 lbs/sq in 67 lbs/in 168 lbs/m sq ft 240 lbs 111 in
    900 lbs/sq in 80 lbs/in 222 lbs/m sq ft 260 lbs 115 in
    1100 lbs/sq in 90 lbs/in 264 lbs/m sq ft 280 lbs 120 in
    1300 lbs/sq in 112 lbs/in 360 lbs/m sq ft 300 lbs 125 in

    E-Flute

    Min. Burst Strength
    (lbs/sq in)
    Min. Edge Crust Test
    (lbs/in)
    Min. Combined Weight of Facings
    (lbs/m sq ft)
    Max Weight of Box and Contents
    (lbs)
    Max Outside Dimensions
    (L + W + D in)
    150 lbs/sq in 26 lbs/in 66 lbs/m sq ft 35 lbs 50 in
    200 lbs/sq in 32 lbs/in 84 lbs/m sq ft 65 lbs 75 in

    Corrugated Strength Tests

    flute grades

    Edge Crush Test (ECT)

    Force is applied perpendicular to the edge of the corrugated board until it buckles. The results provide accurate representation of the material's strength, durability and stack resistance for heavier loads. The resulting value is shown in pounds per linear inch of load-bearing edge and is reported in ECT ratings.

    Note: 32 ECT is the most commonly used for corrugated material.

    Bursting Test

    The burst test, otherwise known as the Mullen Test, challenges the durability of the corrugated fiberboard’s surface. The burst test determines the amount of force required to puncture the liner board. The resulting value is given in pounds per square inch.

    Note: 200# means 200 pounds per square inch of force applied to the face of the liner board.

    Box Maker Certification

    The Box Maker’s Certification seal is usually printed on the bottom of a box and indicates how well your corrugated box did in the quality control testing process. Although not legally required, these seals act as a form of proof that the box has been properly tested and rated.

    flute grades

    Color Appearance On Kraft Board

    Ink Colors on Kraft Paperboard

    Ink Colors on Kraft Paperboard

    Darker paper stock may alter the color output when printing, making them appear less vibrant and more muted in tone.

    Colors on Kraft with White Ink Behind

    White Undercoat with Color

    White ink can be used as a base on kraft paperboard to ensure colors appear more vibrant while still maintaining the true texture of kraft paper.

    Ink Colors on Kraft Paperboard

    White Ink On Kraft Paperboard

    Using white ink on kraft paper creates a textured contrast on the material due to its natural fibers.