[TowerTalk] Oil For Dummy Load

[Roger (K8RI) on TT]

Its MSDS lists it as non hazardous. The only difference for food grade 
AFAIK is the handling.
Why it goes as hazmat is beyond me.

I used a lot of Dow Derakane Vinyl Ester Resin.  It originally cost 
about $30 a gallon. You could get 5 gallon samples dirt cheap from Dow, 
but never ever tell them it was for an airplane. It was reclassified and 
had hazmat shipping.  Still came UPS, but now it's $80 a gallon.  The 
resin was a very low viscosity compared to epoxy so a fiberglass cloth 
cloth with a much denser weave could be used.   The promoter and 
catalyst were things you didn't want to mix. Nasty results.

It had lots of possibilities for antennas, but the resin had a very 
short shelf life.  Refrigeration really helped.

As for comparability, with organic lubricants, it's a no go.  It quickly 
forms silicon dioxide SiO2 (powered quartz) which is very abrasive.  I 
don't know for sure, but I doubt it would be a good idea to mix with 
organic oils

73

Roger (K8RI)


On 11/30/2015 7:07 AM, Martin A Flynn wrote:
> Roger,
> Buying a 5 gallon pail and splitting it up was the original intent.    
> The potential incompatibility issue with petroleum based oils scared 
> away most of the folks who only needed to top off existing loads.  So 
> we went with a single gallon jug.
>
> Funny thing is because it is not a consumer item, it ships as 
> hazmat.   There is a food service grade version that is not hazmat.  
> Got to love UPS.
>
> 73 Martin Flynn
> W2RWJ
>
>
> On 11/30/2015 1:12 AM, Roger (K8RI) on TT wrote:
>> That transformer fluid is basically, plain old 200 fluid. It may, or 
>> may not contain additives.  IOW, it's good stuff.
>>
>> You can probably get it in 5 gallon lots. Get a group buy?  OTOH how 
>> many hams are willing to pay $50 a gallon?
>>
>> 73
>>
>> Roger.  (K8RI)
>>
>>
>> n 11/29/2015 9:53 PM, Martin A Flynn wrote:
>>> The C84025-1 Coaxial Dynamics load (2.5 kW CCS) at our club station 
>>> uses Dow-Corning Xiameter PMX-200 silicon fluid.
>>>
>>> A gallon was less then $50.00.    We would have went with Diala ZX-4 
>>> transformer oil, but could not find reliable information if the 
>>> residual silicon fluid  would safely mix with the Daila.
>>>
>>> In either case, the right part is fairly inexpensive - why use a 
>>> substitute?
>>>
>>> 73 Martin Flynn
>>> W2RWJ
>>>
>>>
>>> On 11/29/2015 9:02 PM, Bryan Swadener via TowerTalk wrote:
>>>> No, especially when you're pumping a kilowatt into a 90W-rated 
>>>> Globar in only a gallon of media that has only the tin bucket 
>>>> itself to transfer the heat to atmosphere. You need _every bit of 
>>>> advantage_ you can get. As it is, those DLs are rated a kilowatt 
>>>> for only a few seconds. That's why I stopped using my HN31 with an 
>>>> amplifier, and built my compact 1500W (100% D/C) load.
>>>>
>>>> Bryan WA7PRC
>>>>
>>>>
>>>> From: D. Scott MacKenzie
>>>> To: Bryan WA7PRC
>>>> Sent: Sunday, November 29, 2015 5:42 PM
>>>> Subject: RE: [TowerTalk] Oil For Dummy Load
>>>>
>>>> Mineral oil is a proper substitute - and not "dubious."
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: Bryan WA7PRC
>>>>
>>>> Sent: Sunday, November 29, 2015 8:27 PM
>>>> To: towertalk at contesting.com
>>>> Subject: Re: [TowerTalk] Oil For Dummy Load
>>>>
>>>> I found one gallon of actual transformer oil for FREE (unless you 
>>>> count having to drive 2 miles to get it).Why mess around with 
>>>> dubious substitutes when it's available for FREE?
>>>> Bryan WA7PRC
>


-- 

73

Roger (K8RI)


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