Thanks for the link. A few points to clear up in that article :
"Wax cylinders were the forebears of vinyl that we know today. In 1877, Thomas Edison invented the phonograph using cylinders wrapped in tinfoil"
The tinfoil machine recorded / played tinfoil sheets wrapped around a fixed mandrel.
"Edison and Aylsworth advanced the chemistry of records in 1912 when they brought in Condensite, a phenol-formaldehyde resin similar to Bakelite which had been invented five years previous. The sound and finish were far superior to shellac, but the high price of Condensite meant it wasn’t as popular."
Condensite was Edison's name for the varnish applied to the surface of the Diamond Disc. The quote makes it sound like it was the record material itself. Condensite wasn't ever "not popular" as far as I know , but it was substituted for a time in the WWI period with another formula, leading to Diamond Discs with a high degree of surface noise.
"The first vinyl long-playing record was launched in 1930, the 30cm flexible plastic discs were used for DJ copies as they shipped well and had superior broadcast sound, but didn’t prove popular with the general public."
Never heard of these 'DJ' records. Maybe confusing them with the RCA Victor 'Program Transcriptions' of the same time period, made for consumer use. They were 33 1/3 rpm discs and a market failure, partly owing to the Great Depression, among other things. The superior fidelity can be debated as many of them were dubbed from 78 rpm discs. The PT's resemble a hard vinyl compositon, but RCA Victor called it 'Victrolac'. I have some, they aren't that quiet, either, not like modern vinyl.
Polystyrene ? Be surprised if that was used in any 78 production, due to the high tracking forces of 78 rpm players.