4J33 Alloy: The Complete Technical Guide for Precision Glass-Metal Sealing Applications (September 2025 Update)
Executive Summary: Why 4J33 Stands Out in Precision Alloys 4J33 is a iron-nickel-cobalt controlled expansion alloy specifically engineered for matched sealing with hard glass. With its unique thermal expansion characteristics (α ≈ 6.5×10⁻⁶/°C at 20-400°C), it has become the material of choice for critical sealing applications in aerospace, military, and medical industries. The global market for 4J33 is […]