Search Results for: Copper alloys articles
instance, a circuit board is composed of a bare printed circuit board (pcb), integrated circuits (ic), resistors , capacitors , switches, etc. a switch is composed of a case, a lever, a spring, contacts, pins, etc., each of which may be made of different materials. a contact might be composed of a copper
strip with a surface coating. a loudspeaker is composed of a permanent magnet, copper wire, paper, etc. everything that can be identified as a homogeneous material must meet the limit. so if it turns out that the case was made of plastic with ppm ( %) pbb used as a flame retardant, then the entire radio...
https://en.wikipedia.org/wiki/Restriction_of_Hazardous_Substances_Directive