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D3982-21 – Standard Test Method Technical Guide
📐 Scope and Design Parameters
This specification, designated D3982‑21, covers contact molded “fiberglass” ducts intended for handling corrosive fumes and process gases. It emphasizes strength and corrosion resistance for operations exceeding 180 °F (82.2 °C). Ducts are designed for pressures up to 65 psig (34.5 Pa), with inch‑pound units regarded as standard. The standard does not cover resin selection for specific chemical environments and is limited to contact‑molded construction using hand layup or spray‑up methods.
| 🟦 Parameter | 📏 Value | 🎯 Unit |
|---|---|---|
| Maximum Design Pressure | 65 | psig |
| Temperature Threshold for Special Attention | 180 | °F |
| Equivalent SI Temperature | 82.2 | °C |
🧪 Material Composition and Testing
The construction material must be fiberglass with a qualified resin matrix system, such as polyester or vinyl ester, reinforced in accordance with Specification C582. Contact molding methods include “hand layup” and “spray up.” Calculated thickness follows the standard laminate composition tables for Types I and II in Specification C582. Quality is assessed through standardized test methods that verify mechanical and chemical properties.
| 🟦 Test Method | 📏 Standard | 🎯 Purpose |
|---|---|---|
| Barcol Hardness | D2583 | Indentation hardness of rigid plastics |
| Ignition Loss | D2584 | Cured reinforced resin content |
| Chemical Resistance | C581 | Determining chemical resistance for liquid service |
For temperatures over 180 °F (82.2 °C), additional design considerations are required to maintain structural integrity and corrosion resistance. Special attention must be given to strength and chemical compatibility.
⚠️ Installation and Safety Considerations
Installation must comply with NFPA 91 for blower and exhaust systems. Users are responsible for establishing safety practices and adhering to regulatory limitations. This standard references terminology from Terminologies D883 and F412. It does not purport to address all safety concerns; users must evaluate and determine appropriate safety and health practices before use.
This standard does not address all safety concerns, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
❓ Frequently Asked Questions
🔍 What is the design pressure range for D3982‑21 ducts?
Ducts are covered up to a design pressure of 65 psig (34.5 Pa).
💡 Which resin systems are specified for construction?
Permitted resin systems include polyester, vinyl ester, or other qualified resin‑matrix systems meeting Specification C582.
⚡ How is laminate quality verified?
Quality is verified using test methods such as Barcol hardness (D2583), ignition loss (D2584), and chemical resistance (C581).
📌 Is there an international equivalent to this standard?
No known ISO equivalent exists for ASTM D3982‑21.