Buyers should verify a documented quality management system, traceable batch records, calibrated testing equipment, and the ability to produce consistent rubber dispersion and residue performance. Supplier capability should include a lab that can run stability, viscosity, residue, cohesion development, and performance tests relevant to waterproofing or road use. For rubberised grades, confirm the rubber type and content control, filtration strategy, and storage stability data. Commissioning support, application guidance, and evidence of successful reference projects also matter for reducing deployment risk.