Professional PCB Manufacturer 94V0 High Frequency PCB Board ♦ What's 94V0? 94V-0 is the highest vertical-burn classification in the UL 94 plastics-flammability standard. A material rated UL 94V-0 must: Self-extinguish within 10 s after each of two 10-second flame applications Show no flaming drips that ignite cotton placed below the sample Have a total after-flame time ≤ 50 s for all five test specimens Exhibit no burn-through to the holding clamp In the PCB world, a “94V-0