|Fig. 312 -Dr. Leo Baekleland the inventor
of the Phenol-Formaldehyde resin as known as Bakelite.
Major development of synthetic resins improved certainly creative
and imaginative designers to produce innovative types of works including
the domestic radio receiver.
|Fig. 313 - Radio receiver cabinet made with
For historical allocation purpose the plastic age started with the
invention of the Bakelite resin, whose chemical componsition the
Phenol-Formaldehyde, was invented by the Belgian-born Dr. Leo Baekeland.
In the beginning it was used as lacquer and an impregnating fluid,
Bakelite was later combined with various fillers becoming a large
application industrial molding material since it was capable of being
used to turn out exact copies of great different types of articles.
Thus, the bakelite resin must have seemed the answer to the electronic
industry’s long searching for a material to replace the old,
expensive, labour-intensive processes previously required to construct
radio cabinets. Fig 313
|Fig. 314 – Several types of radio receivers
cabinets made with resin Durez.
Soon other types of synthetic resins appeared in the market. Among
them are the ones sold under the trade name of: Catalin and Durez.
The Catalin resin required no pressue to form, as the syroup without
fillers required no pressure to form the cast, being simply poured
into moulds, and then, oven-baked to harden it. Fig. 314
|Fig. 313A - Advertisement of Bakelite resin.
The manufacturers developed innovative types of radios just rang the
changes on basic designs by casting cabinets in a multi sections cast
in contrasting colors that could be mixed and matched to produce a
large range of combined patterns in a handmade appeal.
While the wood and steel were responsible for the radio cabinet’
shape, the plastic material together with new technological developments
as: the 1,4 V thermionic valves, electrical components smaller in
size as well as the AC-DC circuit topology arose the miniaturization
as a new trend in radio manufacturing reaching the top in 1960 with
the launching in the market of the first type of solid-state receiver.
|Fig. 315A - Brazilian made crystal radio receiver
in plastic cabinet circa 1950.
||Fig. 315 - The lauching in the Italian market
one of the first solid state radios made by the German company
NordMend circa 1958.
Radio Industria Televisione Magazine
|Fig 314A -Radio receiver’s cabinet made
with resin “Catalin”.