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D146 – Standard Test Method Technical Guide
📐 Sampling Plan for Saturated Felts and Fabrics
ASTM D146/D146M provides a precise statistical method for roll selection to ensure representative testing. As outlined in Section 3, the number of rolls selected must equal one half the cube root of the total number of rolls in the lot, with a mandated minimum of five rolls. Fractional results are always rounded up to the next highest whole number.
| 📦 Total Rolls in Lot | 🧮 Calculated Half Cube Root | 📐 Rolls Selected for Test |
|---|---|---|
| 2 – 125 | 0.6 – 2.5 | 5 (Minimum) |
| 1,000 | 5.0 | 5 |
| 8,000 | 10.0 | 10 |
| 27,000 | 15.0 | 15 |
| 64,000 | 20.0 © 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence. 📥 Standard Documents Download |