|
|
|
|
|
|
by tliltocatl
3 hours ago
|
|
|
Incandescent bulbs used dumet/platinite, which is an nickel-iron alloy like kovar except it's turned for a different CTE. This stuff isn't that expensive when mass produced - it's just those who can afford usually borosilicate can afford paying a premium for kovar. |
|
|