Phenolic plastiki, inowanzonzi bakelite powder, yakagadzirwa muna 1872 uye yakaiswa mukugadzirwa kwemaindasitiri muna 1909. Ndiyo purasitiki yekare kudarika pasi rose, iyo inowanzonzi mapurasitiki anobva pane phenolic resin, uye imwe yeinonyanya kukosha thermosetting plastiki.Kazhinji, inogona kukamurwa int ...
Verenga zvimwe