In article ,
says...

Took apart a Volvo 850 fuel pump relay. Cracks everywhere.

http://www.viatrack.ca/Misc/FP%20Relay/


Well if they are tin/lead, they are some of the best (worse???) examples
of cold solder joints I've ever seen. It is most likely some Pb free
stuff. Being brittle is pretty much SOP with SAC and the like. That's
why things like avionics and telecom are exempt. I guess being stranded
on the side of the road in January, in Montana, out in the middle of no
where would only kill one or two people...