I am not talking about the diode part of the LED, which is different depending on the color, what I am asking, is what is the material used in the conducting pins and the insulating cover? I am assuming the cover is some sort of plastic, and the pins are some sort of metal, but does anyone know the specific material these are made from? I have searched data sheets, but can only find the elements that make up the diode inside.
Generally the plastic part is epoxy and the leadframe is mild steel with tin plating.
This is not a complete description- the exact composition of the resin will include additives, for example. The bonding wire might be gold or possibly some other metal. There's a small amount of adhesive to bond the die to the lead frame too. Maybe there is some mold release compound clinging to the outside of the plastic.
A reputable manufacturer should be able to tell you the package composition with reasonable precision.
