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D4028 – Standard Test Method Technical Guide
ASTM D4028/D4028M-13 (Reapproved 2021) is the standard specification for solar screening woven from vinyl-coated fiber glass yarn. It establishes requirements for screening designed to reduce solar heat gain while providing outward visibility and interior light, with insect-restraining capabilities equivalent to standard insect screening as per Specification D3656/D3656M. This standard is limited to ribbed patterns woven in the warp direction.
🏗 Scope and Construction Overview
The specification covers vinyl-coated fiber glass solar screening for use in dwellings, buildings, or structures. It defines the construction requirements, including the ribbed pattern in the warp direction. The applicability of this specification to non-rib, double rib, or filling rib constructions is not known. The standard emphasizes that values in SI units and inch-pound units must be considered separately without combining.
⚙️ Physical Requirements and Test Methods
Physical requirements are determined through various test methods referenced in the standard. These include tests for breaking force, yarn count, fabric width, and stability. The screening must be manufactured from vinyl-coated fiber glass yarns that conform to Specification D3374/D3374M. Table 1 lists key test methods employed.
| 📏 Test Method | 🎯 Description |
|---|---|
| D5035 | Breaking Force and Elongation of Textile Fabrics (Strip Method) |
| D3775 | End (Warp) and Pick (Filling) Count of Woven Fabrics |
| D3774 | Width of Textile Fabric |
| D4912/D4912M | Fabric Stability of Vinyl-Coated Glass Yarn Insect Screening |
| D4963/D4963M | Ignition Loss of Glass Fiber Strands and Fabrics |
These tests ensure the screening meets the durability and performance criteria required for solar heat reduction and structural integrity.
📊 Key Specifications and Compliance
To comply with ASTM D4028, solar screening must exhibit specific characteristics such as consistent rib pattern, proper yarn coating, and color stability. The standard references test methods for accelerated weathering (D4909) and solar-optical properties (ANSI/ASHRAE Standard 74-1988). Table 2 outlines general compliance guidelines.
| 🔧 Requirement | 📏 Standard Reference |
|---|---|
| Yarn Quality | D3374/D3374M |
| Insect Restraint | D3656/D3656M |
| Color Change | AATCC Grey Scale Evaluation |
| Unit System | SI or inch-pound (independent use) |
It is crucial that manufacturers and users adhere to these specifications to ensure product reliability and performance.
🛠 Technical Note: Ensure that the vinyl-coated fiber glass yarn meets the requirements of Specification D3374/D3374M to guarantee compatibility with the screening application.
⚠ Safety Caveat: Per Section 1.4 of the standard, it is the responsibility of the user to establish appropriate safety, health, and environmental practices before use. Adhere to all regulatory limitations.
❓ Frequently Asked Questions
🔍 What is the primary purpose of ASTM D4028?
It specifies the requirements for vinyl-coated fiber glass solar screening used for solar heat gain reduction while maintaining outward view and interior light, with insect-restraining capabilities.
💡 What types of constructions are covered under this standard?
The standard applies to screening with a ribbed pattern woven in the warp direction. It does not cover non-rib, double rib, or filling rib constructions.
⚡ Which test methods are crucial for compliance?
Key test methods include D5035 for breaking force, D3775 for yarn count, D3774 for width, and D4912/D4912M for fabric stability, among others.
📌 How should units be handled according to this standard?
Values stated in SI units or inch-pound units are to be regarded separately as standard. They are not exact equivalents, so each system must be used independently without combining.