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Tris(trimethylsilyl)phosphine from Mexico

Tris(trimethylsilyl)phosphine [(Me3Si)3P] contains three direct P-Si-C linkages through silicon, qualifying as organo-inorganic with phosphorus-carbon connectivity via heteroatoms. Falls under HTS 2931.49.0080 as non-halogenated organo-phosphorus derivative. Used in low-valent phosphorus chemistry and semiconductor precursors.

Duty Rate — Mexico → United States

100%

Rate breakdown

9903.04.6096.3%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)

Import Tips

Provide structural analysis confirming P-Si-C chain meets organo-inorganic definition

Pyrophoric nature requires inert atmosphere packaging; include handling instructions

Air-sensitive; vacuum-sealed ampoules mandatory for import clearance

Tris(trimethylsilyl)phosphine from Mexico — Import Duty Rate | HTS 2931.49.00.80