PLATING SPECS

BARREL & RACK
TYPE I – 99.7% GRADE A,B or C
TYPE II – 99.0% GRADE B,C or D
TYPE III – 99.9% GRADE A only
99.0% Minimum Purity

BARREL & RACK
TYPE I – 99.9% Purity
TYPE 2 – 99.0% Purity
TYPE 3 – 98.0% Purity
Grade A – Matte
Grade B- Bright
Grade C- Semi-Bright
Class N- No Tarnish Resistant Coating
Class S- Tarnish Resistant Coating
Engineering Applications see spec. for details

BARREL & RACK
CLASS I – CORROSION PROTECTION
CLASS II – ENGINEERING APPLICATIONS
HARD NICKEL DEPOSIT

BARREL & RACK
SOFT NICKEL DEPOSIT
HARDNESS NOT EXCEEDING 150 KNOOP

BARREL & RACK ONLY
CLASS 1- AS PLATED NO SUBSEQUENT HEAT TREATMENT. A BAKE FOR HYDROGEN EMBRITTLEMENT RELIEF IT IS NOT CONSIDERED A HEAT TREATMENT.
CLASS 2- HEAT TREATED TO OBTAIN REQUIRED HARDNESS MAY BE USED ON ALL METALS NOT AFFECTED BY HEATING TO 500 DEG. F AND ABOVE.
CLASS 3- ALUMINUM ALLOYS HEAT TREATABLE AND BERRYLIUM ALLOYS PROCESSED TO IMPROVE ADHESION OF THE NICKEL DEPSOSIT.
CLASS 4- ALUMINUM ALLOYS HEAT TREATABLE PROCESSED TO IMPROVE ADHESION OF THE NICKEL DEPOSIT.
LOW PHOSPHOROUS NOT TO EXCEED 8%

BARREL & RACK
DEPOSIT NO LESS THAN 99.0% PURE TIN
To call out alloy plating 90/10% refer to AMS-P-81728
Engineering applications see spec. for details

BARREL & RACK
ALLOY PLATING OF TIN/LEAD 60/40 +- 10%

BARREL & RACK
TYPE 1- ENGINEERING PLATING
TYPE 2- PLATING FOR MASKING

BASKET & RACK ONLY
TYPE I- LOW TEMPERATURE
TYPE II- MEDIUM TEMPERATURE
TYPE III- HIGH TEMPERATURE
TYPE IV- FOR PARTS CONTAINING LARGE AMOUNTS OF SULFER OR SELENIUM
TYPE V- FOR HIGH CARBON MARTENISTIC STEEL (440)
TYPE VI- MEDIUM TEMPERATURE