Rubber conveyor belt factory testing should give quality engineers more than isolated laboratory numbers. This guide explains how tensile strength, elongation, adhesion and abrasion tests support supplier qualification, what each test can and cannot prove, and how buyers should review standards, specimen traceability, acceptance criteria and test reports. It also provides practical factory-audit questions, common warning signs and RFQ requirements for evaluating EP and heavy-duty conveyor belt suppliers before approving production or shipment.