Titanium sponge is the porous primary metal produced by reducing titanium tetrachloride, and it is the standard unwrought form used to produce aerospace alloys. Aerospace and defense customers typically require full melt-source traceability — knowing the sponge's country of origin and producer — because qualification standards such as AMS and NADCAP specifications tie alloy certification to documented feedstock provenance.

Both fall within this SITC heading, but at the HTS level the distinction between unwrought forms and powders can place them on different tariff lines. Additionally, powder specifications — particle size distribution, morphology, and alloy composition — are tightly controlled for additive manufacturing and should be documented carefully to support both classification and any applicable quality certifications.