How do industry standards define different classes of bitumen emulsions for construction use?

Standards typically classify emulsions by ionic type (cationic, anionic, sometimes non ionic), setting rate (rapid, medium, slow), and intended application such as tack coat, prime coat, surface dressing, slurry seal, or recycling. Each class is linked to required properties such as viscosity range, storage stability, sieve residue, and residue characteristics. Some standards include polymer modified subclasses with additional residue performance requirements like elastic recovery. For buyers, the practical meaning is that class selection determines application method, breaking behavior window, equipment suitability, and acceptance tests at delivery and on site.