Our beryllium X-ray windows are manufactured as precision, vacuum-tight assemblies designed to provide high X-ray transmission while withstanding demanding thermal and mechanical operating conditions. These assemblies typically consists of a high-purity OFHC copper bodies with stainless steel ends most with integrated internal cooling passages that are metallurgically joined to form leak-tight structures. High-purity (99%) beryllium entrance and exit windows are precision brazed to the copper housing creating a robust bond that maintains structural integrity under vacuum and thermal loading. The integrated liquid-cooling systems efficiently removes heat during operation, while each completed assembly undergoes rigorous helium leak testing to a leak rate below 1 × 10⁻⁸ std cc/sec to verify vacuum integrity and ensure reliable performance in high-energy X-ray applications.