Tentative Specification For Hot Dip Tin Coatings
1.1 Pure Tin
1.1a HALT Tin-Silver
1.2 60/40 (Tin-Lead)
Coating Applications Mechanical Wipe Type 1.1 - 1.2 Air Wipe Leveled Type 1.1, 1.1a - 1.2
Para. 3.0 Coating Thickness Range
3.1 Mechanical 80 micro-inches maximum for Type 1.1 - 1.2
3.1a 20-80 Micro-inch Hot Air Wipe
3.1b Thickness of IMC Layer less than 1 micrometer when initially coated
3.2 Hot Air Level Intermediate:
Range is 50-150 micro-inch for type 1.1, 1.1a - 1.2
3.3 Hot Air Level Hevi-Kote:
Range is 100-300 micro-inch for type 1.1, 1.1a - 1.2
3.4 Hot Air Level Hevi-Kote:
Range is 300 micro-inch minimum for type 1.1, 1.1a - 1.2
3.5 Phase 2 (Task Force) would set standard covering all aspects including thickness requirements to tolerances & testing procedures.
Para. 4.0 Standard Test for Porosity in Coatings
Coating Types 1.1, 1.1a Coating Thickness Commercial range up to 80 micro-inches A.S.T.M. Specification - B809-90-B246 There are no A.S.T.M. specs in print, covering other than what is mentioned above.
Para. 5.0 Thickness Measurement
5.1 X-Ray Fluorescence/Beta Back Scatter
5.2 In case of dispute, X-Ray Fluorescence will dominate.