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Terminology: Types of Corrugated Containers

RSC - Regular Slotted Container

RSC ( Regular Slotted Container )

RSC (Regular Slotted Container) are the typical everyday Corrugated boxes. The lengthwise flaps are one-half the container's width so they meet in the center when folded. The RSC box can be used for most products and is the most common box style.

HSC - Half Slotted Container

HSC ( Half Slotted Containers )

These boxes only have closing flaps on one open end of the box. These are for applications in which you would overload the box with goods or implement another top enclosure.

 FOL - Full Overlap Slotted Container

FOL ( Full Overlap Slotted Containers )

FOL (Full Overlap Slotted Containers) boxes have lengthwise flaps that are almost the width of the box. When these flaps are closed, the outer flaps come to within one inch of making a complete overlap. This style of box is especially resistant to rough handling. HD (Heavy Duty) and DW (Double-Wall) boxes provide even tougher choices.

What Is The Difference Between 32 Ect, 200 Lb. Test, and 275 Lb. Test Boxes?
Choosing the right cardboard box for shipping or packaging is will help your contents survive the perils of everyday handling.

Eliminate shipping damages and costly returns by choosing the right box for your application.

  • UPS recommends 200 lb. test boxes for standard shipping.
  • 200 lb. test boxes are the most commonly used boxes in industry and shipping.
  • 32 ECT boxes are a budget-friendly alternative for lightweight shipments.
  • For most lighter and general-purpose applications, 200# Test and 32ECT are interchangeable
  • However, 200 lb. test boxes are made with heavier paper and have 60% greater bursting strength than 32 ECT boxes.
  • Use 275lb. test boxes for heavier items and even greater protection.
  • 275 lb. test boxes are made with heavier paper and have 38% greater bursting strength than 200 lb. test boxes.

Still unsure of what to use? Call (800) 820-4722 To speak to one of our packaging experts who are standing by to answer your questions and help you choose the right corrugated cardboard box for your packaging requirements. 

Comparing Bursting Test vs. Edge Crush Test

There are currently two tests used throughout the corrugated industry to determine strength.

1. Bursting (Mullen) Test = A measure of the force required to rupture or puncture the face of corrugated board and is measured by a Mullen Tester. 

2. Edge Crush Test (ECT) =  ECT is a measure of the edgewise compressive strength of the corrugated board. It is measured by compressing a small segment of the board on edge between two rigid platens or plates perpendicular to the direction of the flutes until a peak load is established. This is measured in pounds per lineal inch of load-bearing edge (lb/in) but usually reported as an ECT value (for example, 44 ECT).   Information from

  Bursting Test Minimum Edge Crush Test Maximum Load Per Carton
Standard 200# 32 ECT 40 lbs.
Heavy Duty 275# 44 ECT 65 lbs.
Heavy Duty - Double Wall 275# 48 ECT 80 lbs.

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