Safety assurance: Through the UL certification mark, it indicates that the product has passed strict fire prevention, electrical insulation, mechanical strength, and impact resistance tests, minimizing the risk of fire and electric shock to the greatest extent possible.

Global Market Passport: Compliant with both UL and ASTM standards in the United States, widely accepted by the International Electrotechnical Commission (IEC) system, it is an important entry requirement for products to enter North America and many international markets.

Quality consistency: The standard provides unified regulations on material formulation, dimensional tolerances, physical properties (such as compression resistance, impact resistance, bending resistance), and labeling, ensuring that products from different manufacturers have reliable and consistent performance.

Design and procurement basis: Engineers and contractors can directly reference "ASTM/UL 651 Schedule 40 PVC conduit" when designing and specifying products to ensure that the selected materials comply with project specifications and safety regulations (such as the National Electrical Code NEC).

System compatibility: The standard ensures the size matching and connection reliability of the conduit and corresponding accessories (elbows, joints, junction boxes), forming a complete protection system.