Coroplast® is an excellent material for reusable packaging. It can be converted into boxes, bins, totes, dividers. It is ideal for indoor and outdoor applications.
Coroplast® strength and durability have no direct relationship to corrugated fiberboard. The figures provided are offered as a guide and may vary with resin batch and production quality of the finished container. The USAF has established a specification MIL-P-83668 (USAF) for plastic corrugated packaging applications.
Packaging sheets have a 2,500 ft2 minimum per thickness, color, size and must run together.
Basic Colors for Packaging:
White, Light Blue and Black
Standard Colors for Packaging:
Natural and Gray
Premium Colors for Packaging:
Yellow, Green, Red, Orange, Silver, Purple, Brown, Medium Blue and Navy Blue
Advantages of Coroplast® Containers
- Usually designed to ship flat when empty
- Inert to nearly all acids, chemicals, detergents, grease & oils
- Withstands temperature extremes from -17F to 230F
- Decreases product damage better than corrugated paper
- Greatly reduces shipping costs
- Sanitary & maintenance free durability
- Maintains near new appearance for years
- 100% recyclable & environmentally friendly
Actual stacking loads on corrugated fiberboard cases are normally recommended to be the compression strength divided by a factor of 1.5 to 4.5, depending on the intended storage conditions. Tests on Coroplast® would indicate that a factor of 1.5 – 3.5 will probably be adequate over normal temperature ranges.
Extreme high temperatures will certainly have a negative effect on the stacking strength of Coroplast® boxes while very cool temperatures will increase the strength. Humidity will not cause any change in Coroplast® performance.
With corrugated fiberboard, the drop off in strength as humidity increases is dramatic.
A major performance test series has not yet been performed on Coroplast® boxes. Some independent preliminary test results are offered as a point of reference.
Compression of Other Weights/Densities of Coroplast® 10”x10”x10” Taped RSC
|Thickness||Weight||Compression Average of 6|
|4.0 mm||600gm Black||496 lb. sq. in.|
|4.0 mm||775gm Natural||598 lb. sq. in.|
|4.0 mm||800gm White||786 lb. sq. in.|
|4.0 mm||800gm Natural||694 lb. sq. in.|
|4.0 mm||1000gm Natural||1040 lb. sq. in.|
|5.0 mm||1000gm Natural||1272 lb. sq. in.|
|5.0 mm||1000gm Blue||1567 lb. sq. in.|
The rough handling characteristic of Coroplast® compares well against fiberboard. Tests have shown that Coroplast® has significantly higher burst, puncture and edge and flat crush properties than B flute fiberboard.
Coroplast® will not burst on the Mullen tester.
Test show puncture (Beach Impact) 3 – 4 times higher than corrugated fiberboard of similar stacking ability.
Impact Strength (lbs.sq.in.)
|Degrees F||2.0mm / 400gm||4.0mm / 700gm||4.0mm / 775gm||5.0mm / 1000gm|
Cushioning test show that prior to complete crushing of the Coroplast® flutes; the peak decelerations are in the range of 150 – 400 grams. The acceleration time pulses show that even when fully crushed on the preceding crop, the Coroplast® fluting still resists subsequent compression and provides cushioning Coroplast® is easily compressed under both static and dynamic conditions than fiberboard. A higher stress is needed to crush the flutes and a higher energy is absorbed. The would indicate that Coroplast® will cushion slightly heavier weights from higher drops.
Corrugated Comparison Test
The tests were conducted at 72 degrees Fahrenheit with 50% relative humidity. The test samples were standard 4mm (150lb) polypropylene corrugate and 250lb c-flute corrugated paperboard. No additives were the in samples tested.
|Weight for test||0.15 lbs./ sq ft.||0.15 lbs. / sq. ft.|
|Water Absorption in 24 hours||0.02%||75%|
|Edge Crush||45 lbs. sq. ft.||5 lbs. sq. ft.|
|Flat Crush||80 lbs. / sq. inch||3 lbs. / sq. inch|
|Tear Strength||1,700 grams||10 grams|
|Tensile Strength||4,000 lbs. / sq. inch||200 lbs. / sq. inch|
|Impact Dart||320 inches / lb.||32 inches / lb.|
|Heat Deflection load @ 66 lbs. per sq. inch||174 degrees||Not Applicable|
|Living Hinge||21,000 cycles||1,000 cycles|
The test results of same weight equivalent materials indicated that Coroplast® performance exceeds, in every area, the corrugate paper performance. This is especially true in the areas of the heat deflection load at 66 lbs. / sq. inch.
All strength test properties areas indicate a minimum ten-fold advantage (edge crush) with Coroplast® over the paper corrugate. In some instances, Coroplast® has a 3,750 fold (water absorption) advantage. It is also important to remember that comparison does not test contamination issues of the paper corrugate versus Coroplast® inert properties associated with chemicals, acids, detergents, greases and oil.
However, the result of water absorption test does give a hint of the expected test result of absorption of acids, chemicals, greases and oils. Thermal and hinge tests are an area that have unique properties addressed on by Coroplast®.
Overall, the end result is Coroplast® packaging protects your products better than corrugated paper.