The "94V-0" rating is largely determined by the substrate material, usually . FR-4 is a glass-reinforced epoxy laminate sheet. To achieve a UL 94V-0 rating, the epoxy resin is treated with flame-retardant chemicals (historically brominated, though RoHS now regulates these).
Word count: ~2,150. For further reading, consult UL’s “Guide for Plastics Flammability” (UL 94 6th Edition) and the EU’s official RoHS guidance document “Are you ready for RoHS 3?”
This article will decode these markings, explain why they appear on driver boards (such as LED drivers or motor controllers), and guide you on how to interpret these labels to ensure your products are safe, compliant, and high-quality.
94V-0 plastics often have a of 110–130°C. However, RoHS lead-free soldering requires higher reflow temperatures (260°C). The driver’s assembly process must not degrade the flammability rating.