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D3656 – Standard Test Method Technical Guide
📐 Scope and Product Classification
ASTM D3656/D3656M – 13 (Reapproved 2021) defines the standard specification for insect screening and louver cloth woven from vinyl-coated glass yarns. This document serves as a crucial reference for manufacturers, specifiers, and users, designating the standardized sizes and types that are generally available in the industry.
Section 1.3 explicitly outlines two primary product categories:
- Insect Screening: Woven primarily for installation in dwellings, patios, and enclosures. Its purpose is to exclude flies, mosquitoes, and most other small insects while maintaining outward visibility and airflow.
- Louver Cloth: A heavier construction intended for soffit and louver vents. It is designed to keep out large insects, birds, and airborne litter while ensuring adequate ventilation and air circulation.
⚠️ Critical Note on Units: Per Section 1.4, the values in SI units and inch-pound units are separately standard. They are not exact equivalents. To ensure full conformance, users must independently adhere to one system and must not combine values from both.
⚙️ Test Methods and Key Measured Properties
Conformance to ASTM D3656/D3656M is verified through a rigorous suite of standardized testing protocols. The following table details the core evaluative criteria, their governing test methods, and the specific property they assess.
| 🟦 Property Evaluated | 📏 Standard Test Method | 🎯 Application |
|---|---|---|
| Bursting Strength | D3786/D3786M | Measures resistance to puncture and multi-directional pressure using a hydraulic diaphragm tester. |
| End (Warp) and Pick (Filling) Count | D3775 | Verifies the thread density per unit length, directly influencing the mesh opening for
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