Emulsion Stability Test

An emulsion stability test is used to assess whether a bitumen emulsion remains uniformly mixed over time without separating. Stability is important to ensure the material performs predictably during spraying and bonding.

The test checks resistance to breaking or separation under controlled conditions, providing confidence that the emulsion will remain consistent during storage, transport, and application. Poor stability can result in uneven spray patterns, blocked equipment, and reduced adhesion on site.

Stability testing is standard practice within surface dressing and road maintenance programmes, particularly where a lorry-mounted sprayer is used and outputs are set using a nozzle calibration chart.