What factors should be evaluated when selecting asphalt emulsion manufacturers for long-term supply?

Evaluate consistent grade compliance to ASTM or AASHTO specs, batch traceability with COAs, and lab capability for routine tests like residue, viscosity, sieve, stability, and demulsibility. Check plant capacity versus your peak demand, storage and terminal network, and tanker fleet reliability. Commercially, review price adjustment formulas tied to binder indexes, minimum order quantities, and lead times. Also confirm technical support for calibration and troubleshooting, plus change control for emulsifier or base binder sources to avoid performance drift over multi year contracts.