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D4022 – Standard Test Method Technical Guide
📐 Scope and Material Composition
This specification, formally designated as Standard Specification for Coal Tar Roof Cement, Asbestos Containing under ASTM D4022/D4022M, establishes the requirements for cement used in trowel application for coal tar roofing and flashing systems. According to Section 3, the cement must consist of a processed coal tar base combined with volatile solvents and mineral fillers that explicitly include asbestos fibers, blended to a smooth and uniform consistency suitable for application.
A critical requirement of the standard is the strict separation of unit systems. The values stated in SI units or inch-pound units are to be regarded separately as standard. Section 1.2 explicitly prohibits combining values from the two systems, as they are not exact equivalents and doing so may result in non-conformance with the standard.
📊 Performance Requirements and Compliance Verification
Conformance to the standard is confirmed through a series of specific performance tests and defined sampling protocols. All material must be sampled in accordance with Practice D140 immediately after stirring. The primary performance criteria and their associated test methods are summarized in the tables below.
| 🟦 Property | 📏 Requirement |
|---|---|
| Uniformity (72 hours, closed container, room temp) | No separation of solvent or settling that cannot be overcome by moderate stirring |
| Workability | Spreads readily; permits troweling of 1.6 to 3.2 mm (1/16 to 1/8 in.) coatings on vertical surfaces |
| Behavior at 60°C (140°F) | No evidence of blistering. Sag or slide no greater than 6 mm (1/4 in.) |
| Adhesion to Wet Surfaces | Minimum average adhesion of 75% |
| Flash Point (Tag Open-Cup) | 38°C (100°F) minimum |
| ⚙️ Test Parameter | 📄 Referenced Standard |
|---|---|
| Water Content | Test Method D95 |
| Nonvolatile Matter | Test Methods D6511 |
| Flash Point | Test Method D3143 |
| Wet Surface Adhesion | Test Method D3409 |
| Sampling Procedure | Practice D140 |
⚠️ Regulatory Warning for Asbestos Handling: This standard covers an asbestos-containing material. Users must establish appropriate safety and health practices as highlighted in Section 1.3. Strict adherence to all OSHA, EPA, and local regulatory requirements for handling, application, and disposal of asbestos fibers is mandatory.
💡 Sampling Best Practice: For accurate compliance testing, restir the sample immediately before withdrawing portions for individual tests to ensure uniformity, as explicitly required by Section 6.2 of the standard.
❓ Frequently Asked Questions
🔍 What is the specific composition of the filler required by this standard?
The standard specifies that the mineral filler system must include asbestos fibers. These fibers are mixed with the processed coal tar base and volatile solvents to create the smooth, uniform consistency required for trowel application.
💡 How is the thermal stability of the cement evaluated?
The cement is tested at a temperature of 60°C (140°F). To pass, the material must show no evidence of blistering, and any sag or slide must be no greater than 6 mm (1/4 in.).
⚡ What is the minimum flash point, and how is it determined?
The minimum flash point is 38°C (100°F). This is determined using Test Method D3143, which measures the flash point of cutback asphalt with a Tag Open-Cup apparatus.
📌 Can SI and inch-pound units be used interchangeably within the same project?
No. Section 1.2 strictly states that the values in each system may not be exact equivalents and must be used independently. Combining values from the two systems is prohibited as it may result in non-conformance with the standard.