The economic way to prolong Speedglas welding filters, these replacement plates protect the welding filter from sparks and spatter to prevent it from becoming pitted and scratched. Features and Benefits Replaces worn and damaged parts to maintain levels of safety Maintains clear vision Can be cleaned with a soft cloth to prolong usage Standards BS EN379 Notes Classification: 1/1/1/2 - Dark state: Shade 5, 8, 9-13 (variable) Fail-safe state: Shade 5 - Light state: Shade 3 Switching time: Light-dark: 0.1ms Delay (switching time dark-light): User-adjustable 40-1300 ms Solar cell: No