Lead Fluorosilicate sol. 40%

Chemistry & Physical Properties

Lead(II) hexafluorosilicate, formula PbSiF6, formula weight 349.27 g/mol. Supplied as a clear colourless 40% w/w aqueous solution. Density approximately 1.95 g/cm3. The aquated species is [Pb(H2O)x]2+ paired with the [SiF6]2- anion. Aqueous pH typically 1.5-3. Decomposes on heating to release SiF4 and PbF2.

Standards & Specifications

Industrial plating-grade specifications align with ASTM B200 (Standard Specification for Electrodeposited Coatings of Lead and Lead-Tin Alloys). Reference military specification MIL-P-19419 (Plating, Lead) provides bath-chemistry guidance. Pharmacopeial and food-contact grades are not specified for lead compounds.

Regulatory & Transport Profile

CAS 25808-74-6. UN 3287 — Class 6.1 (Toxic), PG I/II depending on concentration. GHS pictograms: GHS06 (toxic), GHS08 (health hazard — lead reproductive toxicity), GHS09 (environmental hazard, very toxic). REACH Annex XVII Entry 63 (lead and its compounds). RoHS Restricted Substance — industrial/aerospace exemptions apply. EU End-of-Life Vehicle Directive restricts in new vehicles.

Available Grades

Frequently Asked Questions

Is lead plating still legal?

Restricted but not banned. Industrial bearing surfaces, aerospace, and certain corrosion-resistant applications remain exempt under REACH Annex XVII and similar regulations.

Why is the fluorosilicate form preferred over acetate?

Fluorosilicate baths give smoother, denser, more corrosion-resistant deposits and tolerate higher current densities (5-25 A/dm2) than acetate or methanesulfonate alternatives.

What documentation is required for purchase?

End-user declaration, REACH/RoHS exemption confirmation where applicable, and export-control documentation depending on destination country.

How is it stored?

In sealed HDPE carboys (35 kg) or HDPE drums (250 kg), away from strong acids and reducing agents. Shelf life 12+ months sealed.

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Authoritative References & External Data Sources

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