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Tin Plating

Color is gray-white in a plated condition. Has very high luster in fused condition. Soft, but is very ductile. Corrosion resistance is good. (Coated items should meet 24 hour 5% salt spray requirement). Solderability is excellent. Tin is not good for low temperature applications (changes structure and loses adhesion when exposed to temperatures below -40º C.) Plate directly on steel substance (no undercoating for steel unless otherwise specified).

Spec. Thickness Comment
MIL-T-10727C As specified on drawing.

Thickness guide (not part of spec.) as follows:
Alexandria Metal Finishers provides both bright and matte finishes. If not specified, bright will be generally provided
Please note: This specification is provided for reference purposes only as it has been superceded by ASTM-B-545 (See below) and ASTM-B-339 (not available at Alexandria Metal Finishers).
Type I -------------------------------------- Electrodeposited. Use ASTM-B-545 as guideline.
.0001-.00025" Flash for soldering
.0002-.0004" To prevent galling and seizing.
.0003 min. Where corrosion resistance is important
.0002-.0006" To prevent formation of case hardening during nitriding.
Type II -------------------------------------- Hot dipped (not currently available at Alexandria Metal Finishers).
Tin
Spec. Thickness Comment
ASTM-B-545-97e1 ASTM requires purchaser to supply information, such as base metal, underplating, test requirements and test methods etc. In general, copper alloys containing more than 5% Zn shall have a copper undercoating of at least 0.0001" or nickel undercoating of at least 0.000050".
Class A .0001" min
Class B .0002" min
Class C .00032" min .0004" min. for steel.
Class D .0006" min .0008" min. for steel.
Class E .0012" min ASTM requires purchaser to supply information, such as base metal, underplating, test requirements and test methods etc. In general, copper alloys containing more than 5% Zn shall have a copper undercoating of at least 0.0001" or nickel undercoating of at least 0.000050".
Type Matte
Type Bright
Type Flow-
brightened
------------------------------------- Flow brightening not currently available at
Alexandria Metal Finishers

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Alexandria Metal Finishers
9418 Gunston Cove Road - Lorton, VA 22079-2314
Phone: 703-643-1636 • Fax 703-690-6731
e-mail: alex.metal@verizon.net

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