Custom Box Service stocks many common grades of corrugated cardboard. For larger orders, we can obtain sheets cut to size so that there is no waste (“trim”), thus reducing the cost of the box. Also, for larger orders we can obtain grades of board not listed below. However, our machinery can’t handle material heavier than 275# single-wall or 350# double-wall.

Below is a list of the grades of material that we stock. The list indicates both the Mullen Test and the Edge Crush Test (ECT) values of the board, as well as the actual board combination that we order from our suppliers. During the past decade, the box industry has moved to ECT material as a standard, so we do stock some ECT board for our heavier materials. We’re big fans of Mullen board, however; it may cost a little more, but it’s also much higher quality. Unfortunately our access to Mullen board has become quite limited.

This is probably more information than you need, but we provide it for those that want to know. if you have questions or concerns.

Single-Wall Corrugated Cardboard

40 ECT Single-Wall (Kraft) [56-26-35]
200# Single-wall (White) [42-26-42]
Just as most people consider an RSC to be a "standard box", they consider 32 ECT single-wall to be "standard material". We can custom order 32 ECT board for higher square footage runs, but don't keep any of this material in stock. For our standard stock sheets, we carry either 40 ECT Kraft or 200# White single-wall material:

• 40 ECT C-flute natural Kraft
• 40 ECT B-flute natural Kraft
• 200# C-flute White (one-side)

Because we use more 32 ECT and 40 ECT single-wall than any other type of material, we receive favorable pricing on it from our suppliers. As a result, it's frequently less expensive for us to manufacture a box from 32 ECT or 40 ECT single-wall than to manufacture a box from a lighter grade of material.

44 ECT Single-wall [56-26-56]
275# Single-wall [69-26-69]
For some applications, 32 ECT, 200#, or 40 ECT single-wall is too light to adequately protect the items being shipped. In these cases, if a double-wall material isn't needed, 44 ECT and 275# single-wall are strong enough to protect the contents of the box. Because the liners are made with a heavier 56# paper (69# paper for 275# single-wall), these heavy-duty single-wall grades provide additional stacking strength and increased puncture resistance when compared with standard single-wall. We carry the following types of board in these weights:

• 44 ECT C-flute natural Kraft
• 44 ECT C-flute White (one-side)
• 275# C-flute natural Kraft

Double-Wall Corrugated Cardboard

51 ECT Double-Wall [35-26-35-26-35]
Many boxes require more protection than single-wall corrugated can provide. In these cases, double-wall corrugated is an ideal solution. Double-wall material features two layers of corrugated medium, producing a "double-decker sandwich" effect. With 51 ECT double-wall material, a box has increased stacking strength.

We carry two types of 51 ECT double-wall material:

• 51 ECT DW natural Kraft
• 51 ECT DW White (one-side)

This material is typically used for shipping heavy loads and for shipping items with sharp edges.

350# Double-Wall [42-26-42-26-42]
Do you need a material stronger than 275# single-wall or 51 ECT double-wall? For maximum strength and even better puncture resistance, consider 350# double-wall material. This material is used for the heaviest loads and the most demanding shipping conditions.

We only stock one type of this grade:

• 350# DW natural Kraft

Because the box industry has moved to ECT material during the past decade, this board type has limited availability. Contact us if you suspect 350# double-wall is right for you.