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D228 – Standard Test Method Technical Guide
ASTM D228/D228M-21 is the definitive standard for evaluating the quality, durability, and composition of asphalt-based steep roofing materials, including roll roofing, cap sheets, and shingles. Covering everything from initial field sampling to detailed chemical analysis, this standard provides a consistent framework for manufacturers, specifiers, and testing laboratories to ensure products meet rigorous performance criteria.
📐 Specimen Selection and Preparation
The testing regime begins with proper sampling (Section 7) and mass and area determination (Section 8). A minimum area of 0.5 m² [5 ft²] is typically required to represent the product. Section 9 outlines the critical process of selecting representative specimens, while Section 15 details the preparation of small test specimens for subsequent chemical analyses. The physical dimensions of the test specimens are strictly dictated by the specific test method being performed.
| 🟦 Test Procedure | 📏 Section | 📐 Specimen Requirements | 🎯 Key Conditions | ⚡ Measured Property |
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