CEP932-105-9 - Shade 9 Glass Welding Lens 2x4.25 Inch

Technical Overview of the Shade 9 Glass Filter Plate

The Lense Filter Plate Shade 9 2X4 is a fundamental component for personal protective equipment in the welding industry. Designed to fit standard passive welding helmets and handheld shields, this filter plate measures nominally 2 inches by 4-1/4 inches (approx. 50mm x 108mm), the industry-standard size for fixed-shade viewing windows. The lens is manufactured from high-quality, heat-treated glass, which ensures dimensional stability and resistance to thermal shock during welding operations.

As a passive optical filter, this lens provides a constant Shade 9 darkness level. This shade is typically appropriate for lower amperage welding processes, such as low-current MIG (GMAW) or Stick (SMAW) welding, depending on the arc intensity and the welder's comfort. The glass composition is formulated to effectively block harmful ultraviolet (UV) and infrared (IR) radiation generated by the welding arc, protecting the operator's eyes from photokeratitis (arc eye) and long-term retinal damage. Unlike auto-darkening filters (ADF), this passive glass plate has no electronics, sensors, or switching speed latency, offering immediate and fail-safe protection the moment the arc is struck.

The heat-treatment process used in manufacturing this plate enhances its durability, making it more resistant to breakage from minor impacts compared to non-treated glass, although it should always be used in conjunction with clear safety cover lenses (polycarbonate) on both the front and rear to prevent spatter adhesion and protect against high-velocity impact. The optical quality of glass is often preferred for its lack of distortion and uniform shading across the entire field of view.

Key Technical Specifications:

• Material: Heat Treated Optical Glass
• Shade Number: 9 (Dark State)
• Dimensions: 2" x 4-1/4" (Standard)
• Transmittance: Compliant with safety standards for UV/IR filtration