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 Post subject: RCA 8-X-9J Case Material?
PostPosted: Jul Thu 25, 2019 2:33 am 
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Joined: Jul Wed 24, 2019 3:21 am
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Hello All,

I'm currently working on an RCA 8-X-9J table top AA5. I believe it was made in the early to mid 50's. I'm curious to know if someone could tell me if the case material is plastic or Bakelite.

Any insight would be greatly appreciated - picture attached for reference.

Thank you!


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 Post subject: Re: RCA 8-X-9J Case Material?
PostPosted: Jul Thu 25, 2019 9:48 am 
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From where I'm sitting, that looks like plastic, not Bakelite.

RadioMuseum agrees: https://www.radiomuseum.org/r/rca_8_x_9 ... 1140a.html

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 Post subject: Re: RCA 8-X-9J Case Material?
PostPosted: Jul Thu 25, 2019 2:45 pm 
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Bakelite is always black, or milk chocolate brown (sometimes reddish brown) or darker. And is usually thicker than later plastics. Some Bakelite radios are painted but never on the inside so pulling the back will reveal the bare plastic.


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 Post subject: Re: RCA 8-X-9J Case Material?
PostPosted: Jul Thu 25, 2019 7:18 pm 
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Location: S. Dartmouth MA 02748-1225 USA
Bakelite, Catalin are thermosetting resins, will not melt but char then burn. If the case is a thermoforming resin, it will melt and with heat and with a solvent such as acetone. To test use a hot pin in an obscure area, only a slight char may occur with Bakelite, acetone on a cotton swab will do nothing. A thermoformed case will melt with the hot pin and acetone will permanently mar the finish. A thermoformed case may have a "gate" where the plastic was injected into the mold.

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 Post subject: Re: RCA 8-X-9J Case Material?
PostPosted: Jul Fri 26, 2019 3:05 am 
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Joined: Jul Wed 24, 2019 3:21 am
Posts: 9
Thank you gentlemen - very helpful!


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