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D1327 – Standard Test Method Technical Guide
📐 Materials and Manufacture
The fabric specified in this standard must be composed of 100% jute fiber, with two cotton threads permitted in each selvage. If a selvage is present, it must not exceed 6 mm [¼ in.] in width. The minimum fabric construction is a burlap weight of at least 180 g/m² [5.4 oz/yd²]. During manufacture, the dry burlap fabric is saturated with bitumen—either asphalt or refined coal-tar—as specified by the purchaser. Asphalt-saturated fabric is intended for use with asphalt-based plying cements (e.g., those conforming to D312/D312M or D449/D449M), while coal-tar-saturated fabric is used with coal-tar-based plying cements (e.g., D450/D450M) or appropriate solvent-bearing bituminous materials.
⚙️ Physical Properties and Requirements
The saturated fabric must meet the physical property requirements outlined in the standard’s Table 1. It must be capable of being unrolled without cracking or becoming excessively sticky within the temperature range of 10 °C to 60 °C [50 °F to 140 °F]. Resistance to rotting is a critical performance measure: after one week of exposure as prescribed in AATCC Method 30‑1974, the retained strength of the saturated product must be at least 1.75 times that of the unexposed control sample.
| 🟦 Property | 📏 Specification |
|---|---|
| Fiber Composition | 100% Jute (except cotton suture threads in selvage) |
| Selvage Width | ≤ 6 mm [¼ in.] |
| Minimum Burlap Weight | 180 g/m² [5.4 oz/yd²] |
| Unrolling Temperature Range | 10 °C to 60 °C [50 °F to 140 °F] |
| Rot Resistance (strength retention ratio) | ≥ 1.75 × control sample |
⚠️ The saturant must thoroughly stain every fiber uniformly. Incomplete saturation can lead to delamination or weak spots in the roofing or waterproofing membrane system.
💡 For best results, always match the saturant type (asphalt or coal‑tar) with the corresponding plying cement specified by the manufacturer. Compatibility ensures long‑term membrane integrity.
❓ Frequently Asked Questions
🔍 What is the primary application of bitumen-saturated burlap fabrics?
These fabrics are used in built‑up roofing and waterproofing membrane systems. They provide reinforcement and waterproofing when combined with hot‑applied bituminous cements or appropriate solvent‑bearing materials.
💡 How is the rotting resistance test performed?
The fabric is tested according to AATCC Method 30‑1974. After one week of exposure to conditions that promote mildew and rot, the retained tensile strength is compared to a control sample. The saturated fabric must retain at least 1.75 times the strength percentage of the control.
⚡ What handling precautions are specified?
Rolls must be unrollable without cracking or sticking between 10 °C and 60 °C [50 °F‑140 °F]. Avoid unrolling below the lower limit, as the material may crack; above the upper limit, sticking can cause tearing or material damage.
📌 Are there any composition restrictions?
Yes, the base fabric must be 100% jute except for two cotton threads in each selvage. The selvage itself, if used, is limited to 6 mm [¼ in.] in width. No synthetic fibers are allowed in the body of the fabric.