You can get solid rod in G-10 too. Also, one might look at Glastic which is the
redish pink fiberglass material out now. They have it in sheet and rod. They
also make standoffs with it. I'm not sure of the price on Glastic though but it
should be close to other fiberglass products. Harold Mandel on here uses it in
sheets and may know the current pricing. Remember, it dont matter what color it
is, just so it works. I have a plastics supplier catalog here somewhere that
has pretty much everything available. I'll try to find it and see what's
available and some pricing. I would think some other plastics would hold up
just as well as Teflon, with a lesser price, unless it's one of those
"space-age" types which is not used much, and are very expensive.
Best,
Will
*********** REPLY SEPARATOR ***********
On 4/14/05 at 10:15 AM Tony King - W4ZT wrote:
>R.Measures wrote:
>
>>On Apr 13, 2005, at 5:06 PM, Bob Maser wrote:
>>
>>
>>
>>>McMaster/Carr sells electrical grade PTFE 1-1/2" rod for $35.04 per
>>>foot. I
>>>don't call that expensive.
>>>
>>>
>>
>>Plastifab (818 967 9376) carries various diameters of G-10 tubing.
>>0.75" dia goes for around $1.20 a foot. G-10 is RF-friendly, does not
>>cold-flow like TFE, and it is easy to fabricate.
>><snip>
>>
>>
>I agree with Rich that fiberglass tube is by far the least costly
>material and is commonly available. It may come down to a matter of
>comparing the minimum order from your supplier with the cost of a foot
>of PTFE. With the PTFE you only need to drill and tap a hole in the end
>of the rod to mount it and you can drill small holes for brass screws or
>pins to attach the wires. With fiberglass tube you'll still have to
>come up with a mounting for the tube.
>
>McMaster-Carr <http://mcmaster.com> lists Fiberglass tube and G-10 tube
>separately and at dramatically different prices. Using 1" OD virgin PTFE
>rod to compare with the 1" OD tube at McMaster, here is what I found:
>
>1" OD PTFE solid rod, dielectric strength 500 V/mil: $16.79 per foot.
>(page 3338)
>
>1" OD Fiberglass tube (glass fiber-reinforced polyester), dielectric
>strength 200 V/mil: $2.27 per foot (5 ft length @ $11.34 minimum order)
>(page 3345)
>
>1" OD G-10 Garolite (glass-cloth laminate with epoxy resin), dielectric
>strength 300 V/mil: $13.71 per foot (39" length @ $44.55 minimum order)
>(page 3352)
>
>Any of these will work fine for the RF choke.
>
>McMaster gets high marks with me. They warehouse locally, keep a good
>stock and I get 24 hour delivery on a phone or Internet order.
>
>73, Tony W4ZT
>
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