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ASTM Designation: B 545
Electrodeposited Tin Coating
|Class||Minimum Thickness||Typical Applications|
|A||2.5 µm (100 µin)||Mild service conditions, particularly where the significant surface is shielded from the atmosphere (as in electronic connector housings.)|
|B||5 µm (200 µin)||Mild service conditions with less sever requirements than Class C.|
|C||8 µm (320 µin)10 µm (400 µin) for steel substrates||Moderate exposure conditions, usually indoors, but more severe than Class B|
|D||15 µm (600 µin)20 µm (800 µin) for steel substrates||Severe service, including exposure to dampness and mild corrosion from moderate industrial environments.|
|E||30 µm (0.0012 in)||Very severe service conditions, including elevated temperatures, where underlying metal diffusion and intermetallic formation processes are accelerated.|
|F||1.5 µm (60 µin.)||Similar to Class A, but for shorter-term contact applications and short shelf-life requirements, subject to purchaser approval.|
Surface Appearance Type (Electroplating Process)
Matte Tin Electrodeposits – Coating with a matte appearance are obtained from tin plating baths (stannate, sulfate, methylsulfonate, and fluoborate) used without the addition of brightening agents.
Bright Tin Electrodeposits – Bright coatings are obtained when proprietary brightening agents are used in specific bright tin plating baths.
Flow-Brightened Electrodeposits – Flow –brightened coatings are obtained by heating the matte coating above the melting point of tin for a few seconds, followed by quenching.