Unwrought Platinum Sponge from Japan
Platinum sponge is a porous, unwrought form of platinum produced by chemical precipitation and reduction processes, containing over 99.9% pure platinum by weight. It falls under HTS 7110.11.0050 as unwrought platinum in powder form where 90% or more passes through a 0.5 mm sieve, distinct from bars or ingots. This form is commonly used in catalysis and jewelry fabrication.
Duty Rate — Japan → United States
Rate breakdown
Import Tips
• Provide assay certificates verifying platinum purity exceeds 99.5% and powder fineness meets subheading note criteria (90% through 0.5mm sieve)
• Declare exact weight and form (sponge/powder) on commercial invoice; misclassification as semimanufactured risks re-assessment under 7110.19
• Ensure CITES-free sourcing documentation if alloyed traces suggest conflict minerals; common pitfall is undervaluation based on spot price fluctuations