When sourcing titanium armor, the most critical factor is the alloy grade. Ti-6Al-4V (Grade 5) is the industry standard due to its exceptional strength-to-weight ratio. For specialized ballistic applications, Grade 5 ELI (Extra Low Interstitials) offers enhanced toughness. Ensure the plates meet MIL-DTL-46077 (the U.S. military detail specification for titanium armor) or equivalent international standards. Key metrics to verify include V50 ballistic limit testing, Brinell hardness (HBW), and tensile strength (min 895 MPa).