AAC triple wall: thickness, flutes per foot and strength

AAC triple wall stacks two A flutes and a C flute between four liners, about 0.53 in thick in Packgent's nominal sum. It is the board used for bulk bins and heavy unit loads.

Key numbers

Construction	Triple wall: three mediums, four liners
Plies	A flute + A flute + C flute
Nominal caliper	0.5313 in · 13.6 mm
OD minus ID, length and width	1.063 in
OD minus ID, depth	1.594 in
McKee strength vs C flute, same ECT	184%

Caliper is the sum of A flute (0.1875 in) and A flute (0.1875 in) and C flute (0.1563 in), computed by Packgent. Real board is slightly thinner after combining and converting.

Strength ratio = √(caliper ÷ C-flute caliper), from the McKee formula with ECT and perimeter held equal.

Trade-offs

By far the highest McKee estimate here, though McKee was fitted on smaller boxes, so treat bulk-bin numbers with care
Heavy and stiff; needs equipment that can score thick board
Common in gaylords rather than cases

Typical uses

Gaylords and bulk bins
Crates for heavy equipment

Estimated box compression at 10 sizes

Simplified McKee BCT, lbf, empty box, by inside size and ECT
Inside size, in	90 ECT	112 ECT
8 × 6 × 4	2,038	2,536
10 × 8 × 6	2,310	2,875
12 × 12 × 12	2,668	3,320
14 × 10 × 8	2,668	3,320
16 × 12 × 10	2,882	3,586
18 × 12 × 12	2,983	3,712
18 × 18 × 18	3,268	4,066
20 × 16 × 14	3,268	4,066
24 × 18 × 18	3,529	4,392
24 × 24 × 24	3,773	4,695

BCT ≈ 5.87 × ECT × √(caliper × perimeter), perimeter = 2(L + W) of the inside size. An estimate; confirm with ASTM D642. Grades shown are ECT values Packgent computes for this wall type, not a list of what mills sell.

Sources

Last reviewed 2026-10-27. See all sources and how Packgent computes.