Compliance is non-negotiable in cross-border trade. Ensure the boards carry CE (Europe), FCC (USA), or CCC (China) certifications depending on your target market. For safety, look for UL 94V-0 rated PCB materials, which guarantee flame retardancy. From a technical standpoint, check the operating temperature range (standard industrial grade is usually -40°C to +85°C) and ensure the board supports necessary communication protocols such as RS-485, CAN bus, Modbus, or Ethernet/IP. Additionally, verify RoHS compliance to ensure the product is free from hazardous substances like lead.