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D1227 – Standard Test Method Technical Guide
This article provides an overview of ASTM D1227/D1227M – 13 (Reapproved 2024), which specifies requirements for emulsified asphalt coatings used for protective roofing applications. The standard covers two types of emulsions, classified by their composition and reinforcement.
🏗️ Product Classification and Types
The standard defines emulsified asphalt coatings under Type II and Type III, each with two classes based on emulsifying agents:
- Type II, Class 1: Mineral colloid agents with non-asbestos fibers.
- Type II, Class 2: Chemical agents with fillers or non-asbestos fibers.
- Type III, Class 1: Mineral colloid agents without fibrous reinforcement.
- Type III, Class 2: Chemical agents without fibrous reinforcement.
These classifications ensure suitability for various roofing inclines and application methods.
📋 Physical Requirements and Specifications
The emulsion must maintain a smooth, uniform consistency without separation or settlement that cannot be resolved by ordinary stirring. It should be applicable above freezing in thick films without thinning or heating, bonding to both damp and dry surfaces.
Key application rates and limits are summarized below:
| 🟦 Type | 📏 Application Method | 📐 Minimum Rate | 🎯 Incline Limit |
|---|---|---|---|
| Type II | Brush or Mop | 1.0 L/m² [2.5 U.S. gal/100 ft²] | Up to vertical |
| Type II | Spray | 1.0 L/m² [2.5 U.S. gal/100 ft²] | Up to 50% (500 mm/m) [6 in./ft] |
| Type III | Brush or Spray | 1.0 L/m² [2.5 U.S. gal/100 ft²] | Vertical concrete with open-mesh fabric |
All Type II emulsions must be suitable for single coats without rundown, while Type III requires fabric reinforcement for vertical applications.
🛠️ Application Guidelines
Application should be performed above freezing temperatures. Emulsions must not be thinned with water or heated; they should be used as supplied when stirred to homogeneity.
💡 Tip: Stir emulsion thoroughly before use to meet consistency requirements and avoid separation issues during application.
⚠️ Warning: Adhere to unit systems independently. Do not combine SI and inch-pound values to ensure conformance with the standard.
Refer to Table 1 in the standard for full physical property requirements, which include tests from D2939 (withdrawn) for characteristics like residue and viscosity.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D1227?
The standard covers emulsified asphalt used as a protective coating for built-up roofs and exposed surfaces with inclines of at least 4% or 42 mm/m [1/2 in./ft].
💡 What are the main types of emulsified asphalt in this standard?
Type II includes fiber-reinforced emulsions, while Type III excludes fibrous reinforcement. Both have classes based on emulsifying agents (mineral colloid or chemical).
⚡ Can the emulsion be applied in cold weather?
No, the standard specifies application above freezing temperatures. The emulsion should be suitable for application without heating or thinning.
📌 What units are used in the standard?
Values are stated in SI units (L/m², mm/m) and inch-pound units (gal/100 ft², in./ft). Use each system independently without combining.