[GreenKeys] cleaning 28ASR keys

[Bruce Gentry]

The plastic was developed by Eastman Kodak Chemical Co. in Kingsport, 
Tenn. to utilize abundant pine forests as a feedstock. The idea was to 
make wood into an easily moldable material.  I believe it was introduced 
in the early 1930s, it became quite popular, and continued into the 
1990s at least. Older formulas of it warp, shrink, get moldy and mildewy 
in a damp environment, and give off a somewhat unpleasant odor, 
especially when heated or worked. It is stronger in compression than 
tension or deflection.

    Bruce Gentry, KA2IVY



On 4/5/22 7:30, Kevin H. Phillips wrote:
>
> Bruce,
>
> Where was Tenite made and what time period?  I had wondered what the 
> keys were made of.
>
>
> 73
>
> Kevin
>
> W5TTY
>
> On 4/4/2022 11:03 AM, Bruce Gentry via GreenKeys wrote:
>>
>> The keys are made of Tenite plastic or one of it's derivatives, made 
>> from cellulose.  It molds and mildews badly. In worse cases, the mold 
>> sort of corrodes the surface, and a mild abrasive polishing compound 
>> is needed to make the surface smooth again. Tenite aslo has a 
>> distinktive odor when heated or worked. I spent my youth in the place 
>> it was made, pieces of the plastic were easy to get, and the whole 
>> town had an "air" about it. Typists , however, liked the feel and 
>> "touch" of keys made of it, and it was quite popular for keyboards.
>>
>>     Bruce Gentry, KA2IVY
>>
>> On 4/4/22 6:35, Kevin H. Phillips wrote:
>>> I know that others who have worked with these machines have 
>>> encountered similar problems but I can't remember the exact products 
>>> used to clean the keys and thought I would post about something I 
>>> "discovered" while working on the machine I picked up a few weeks 
>>> ago in Houston, TX.
>>>
>>>
>>>
>>> 73
>>>
>>>
>>> Kevin
>>>
>>> W5TTY
>>>
>>>
>>>
>>>
>>>
>>>
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