If I am correct, they are nomenclatured as NPO types. Mouser list NPO caps.

ack Schmidling wrote:
I am in need of zero tc caps for my VFO project but can't seem to find
any info on them. Who makes them? What are they called?

Digikey has some with tc's of 200 ppm but that aint zero.

The also have some that are 0 +/- 500 ppm and that makes no sense.

I need two at 1000 pf.

Thanks,

js