There are three types of circuits for membrane switches

JCF technology offers PET screen printed conductive silver ink circuit, FPC copper flex circuit and PCB printed circuit boards.
1,PET Polyester material membrane switch circuits
The conductive silver ink is printed on .005 polyester, resistance range is <10 ohms to 100 ohms with a rating of 30 volts DC.
2,FPC Copper material membrane switch circuits
Copper flex circuits base material is.001, .002, .003 and .005 polyimide or polyester. Minimum trace width is .004 with a pitch of .004. Copper can be either .5oz, 1.0oz or 2.0oz RA or ED copper.resistance range is <1 ohms to 20 ohms.
3,PCB FR4 material membrane switch circuits
PCB Printed circuit board can be single or double sided. The base material is FR4,CEM-1 or CEM-4. Minimum trace width for gold .003 for hot air leveling .006. Plating thickness dependent on material can either be 1 micron to 25 microns. Plating options include copper, carbon, nickel or gold.resistance range is <1 ohms to 20 ohms.
More information visit:www.jcftechnology.com