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D2823 – Standard Test Method Technical Guide
📐 Scope, Classification, and Composition
This specification, designated D2823/D2823M−05(2011)´1, covers asbestos-containing asphalt roof coatings of brushing or spraying consistency. The coating is manufactured from an asphalt base, volatile petroleum solvents, and mineral stabilizers including asbestos fiber, mixed to a smooth, uniform consistency. Values stated in either SI or inch-pound units must be regarded independently, as they are not exact equivalents.
Classification. Type I coatings utilize self-healing, adhesive, and ductile asphalts conforming to Specification D312 (Type I), D449 (Types I or II), or D946. Type II coatings use asphalts characterized by a high softening point and relatively low ductility, conforming to D312 (Types II or III) or D449 (Type III).
| 🟦 Property | 📏 Limit | ⚡ Test Method |
|---|---|---|
| Water, % | 1.0 max | D6511, Section 10 |
| Nonvolatile matter, % | 50 min | D6511, Section 7 |
| Asbestos and mineral stabilizers, % | 5 – 20 | D6511, Section 18 |
| Asphalt, % | 40 min | D6511, Section 18 |
| Mineral matter (insoluble residue), % | 80 min | D6511, Section 19 |
⚠️ Safety Note: Per Section 1.3, this standard does not purport to address all safety concerns associated with asbestos-containing materials. The user must establish appropriate safety and health practices and determine the applicability of all regulatory limitations prior to use.
⚙️ Physical Requirements and Material Specifications
Uniformity. After a thoroughly stirred sample has stood for 72 hours at room temperature in a closed container, the coating must show no separation of solvent or settling that cannot be overcome by moderate stirring (Section 7.1).
Consistency. The roof coating must be of a consistency that will spread readily and permit application by squeegee, three-knot brush, paint brush, roller, or by spraying (Section 7.2).
The performance characteristics of the finished coating are determined by the asphalt base selected. The following table summarizes the source specifications for each classification type.
| 🎯 Type | 📐 Characteristics | 🔬 Source Specifications |
|---|---|---|
| Type I | Self-healing, adhesive, ductile | D312 (Type I), D449 (Types I/II), D946 |
| Type II | High softening point, low ductility | D312 (Types II/III), D449 (Type III) |
📌 Editorial Note: Units information was editorially revised in June 2011 (ε1). SI and inch-pound units must be used independently of each other; combining values from the two systems may result in non-conformance with the standard.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D2823?
ASTM D2823/D2823M covers asbestos-containing asphalt roof coatings designed for application by brushing, squeegee, roller, or spraying. It defines the specific composition limits and physical requirements for these solvent-bearing bituminous compounds.
💡 What are the key differences between Type I and Type II coatings?
Type I coatings are made from self-healing, adhesive, and ductile asphalts (D312 Type I, D449 Types I/II, D946). Type II coatings utilize asphalts with a high softening point and relatively low ductility (D312 Types II/III, D449 Type III), offering different performance characteristics for specific roofing applications.
⚡ What are the critical composition limits for compliance?
The standard requires a minimum of 50% nonvolatile matter, a minimum of 40% asphalt, and between 5% and 20% asbestos and mineral stabilizers. Water content is capped at 1.0%, and mineral matter based on the original mass of insoluble residue must be at least 80%.
📌 How is the uniformity of the coating evaluated?
Uniformity is tested by allowing a thoroughly stirred, closed sample to stand for 72 hours at room temperature. The coating must show no separation of solvent or settling that cannot be overcome by moderate stirring to be considered acceptable.