Process for making chemical resistant pump diaphragm

A method for making an injection molded multi-polymer pump diaphragm having one side resistant to chemicals, said method comprising the steps of:

• a. injecting molten polymer material of a first type having chemical resistance properties into a first pump diaphragm mold cavity to produce a first pump diaphragm layer;
• b. curing said first pump diaphragm layer;
• c. applying an adhesive to a side of said first pump diaphragm layer;
• d. placing said first pump diaphragm layer in a second pump diaphragm mold cavity sized to receive an amount of a second type of polymer material against said side of said first pump diaphragm layer having said adhesive applied thereto;
• e. injecting molten polymer material of said second type into said second pump diaphragm mold cavity into contact with said adhesive to produce a second pump diaphragm layer adhered to said first pump diaphragm layer;
• f. curing said second pump diaphragm layer such that said first and second pump diaphragm layers adhere together to form a pump diaphragm having one side which is resistant to chemicals;
• and
• g. wherein said first type of polymer material has a first melt temperature and said second type of polymer has a second melt temperature less than said first melt temperature.