Record Technology Inc.
P l a t i n g P r o c e s s
Pictures and descriptions by Gary Salstrom, record plating manager at RTI.
S t e p One
Upon receipt, the lacquer must be prepared for plating.
The lacquer is then soaked in a mild detergent to clean oil residues from the surface.
After thorough rinsing with deionized water and a surface treatment with Stannous chloride, the lacquer is sprayed with customized silver (made from scratch at RTI) to make the surface electrically conductive.
The lacquer is then mounted on a copper hanger and placed in a nickel sulfamate plating bath. RTI uses low temperature and low amperage to ensure proper duplication of the groove walls.
After the master is made (14-16 hours), it must be prepared for plating to make the mother. After a quality control check of the mother, a stamper must be made to press the LP.
The nickel mother is placed into a customized rotary plating tank to make the stamper.
The stamper must be carefully removed from the mother.
To keep the LP surface free of surface roar, the back of the stamper must be sanded to a near mirror-like surface.
The stamper is then centered, trimmed, formed, and washed before being delivered to Q.C. The stamper is then closely inspected before being passed on to the pressline.
Test pressings being pressed on a SMT record pressing machine at RTI.