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D2658-18 – Standard Test Method Technical Guide
ASTM D2658-18 (Reapproved 2023) provides the definitive methodology for determining the interior and exterior dimensions of fiberboard boxes. Administered by ASTM Subcommittee D10.27 on Fiberboard Shipping Containers, this standard is a cornerstone of packaging quality control. It covers regular slotted (RSC) and special slotted styles manufactured from single-wall corrugated, double-wall corrugated, and solid fiberboard, ensuring consistent measurement practices across the industry.
📐 Scope, Types, and Terminology
This test method is specifically designed for regular slotted or special slotted styles of single-wall corrugated, double-wall corrugated, and solid fiberboard boxes (Section 1.1). Precise terminology is critical for consistent application. The standard defines a blank as a flat sheet of containerboard that has been cut, scored, and slotted. The thickness of the combined board is defined as its caliper. The three principal axes are strictly defined to eliminate ambiguity during measurement.
| 🟦 Dimension / Term | 📏 Definition (per D2658) |
|---|---|
| Length | The longer dimension of the opening face of the box. |
| Width | The shorter dimension of the opening face of the box. |
| Depth | The distance between the innermost surfaces measured perpendicular to the length and width. |
| Exterior Dimensions | The measurement of the outermost surfaces of the length, width, and depth. |
| Interior Dimensions | The measurement of the innermost surfaces of the length, width, and depth. |
⚙️ Measurement Methodology and Conditioning
The core of the test method differentiates between exterior and interior measurements. Exterior dimensions are critical for shipping density and pallet patterns. Interior dimensions define the usable cubic capacity of the box. A key feature of this standard is its specific definition of depth — it is universally considered an interior measurement, taken between the innermost surfaces perpendicular to the length and width. This standardizes how box capacity is interpreted across the industry.
Environmental conditioning is non-negotiable for reproducible results.