We have some old boards that we'd like to put to use (high voltage switching power supplies/voltage control)). They require 1kv 1uf ceramic capacitors. Unfortunately the price of those went up through the roof. There are some Polypropylene capacitors that seem to fit the purpose like this one: https://www.illinoiscapacitor.com/pdf/seriesDocuments/PPB%20series.pd but priced more reasonable. Do you think it is an ok replacement?