I have some white UHMWPE that was used as combo thrust and axial
bearings in side arm rotators, sections are over 1" thick. All are
pretty badly crazed and not quite cracked thru after 7 years in the OR
"sun". I didn't make these, so I don't know the grade or supplier of
the material but am cautious about the UV stability of UHMWPE as a
result. I use black material where UV exposure is likely. TIVAR info
on UHMWPE, many grades: http://www.bayplastics.co.uk/polyethylene.htm
Generally, natural UHMWPE is not considered to be UV stable.
I find it hard to machine to tolerance since it is so slippery and
gummy. Very sharp, correct relief tooling is required. Otherwise it
is a very useful material and cheap.
Grant KZ1W
On 12/15/2015 13:31 PM, Hans Hammarquist via TowerTalk wrote:
UHMWPE is available at Walmart (at all places). It's called "TIVAR
GRA0133002037" as sheet Stck, 12 In.x 24 In.x 0.500 In. @ $87.84.
Hans - N2JFS
.
-----Original Message-----
From: Andre VanWyk via TowerTalk <towertalk@contesting.com>
To: towertalk <towertalk@contesting.com>; rcm <robrk@nidhog.net>
Sent: Tue, Dec 15, 2015 3:17 pm
Subject: Re: [TowerTalk] WTB Rohn 25G tower insulator
I will use these if all fails. UHMWPE material will outlast fiberglass in
the sun too.
73's
NJ0F
-----Original Message-----
From: rcm
Sent: Tuesday, December 15, 2015 1:40 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] WTB Rohn 25G tower insulator
http://www.wb0w.com/tower_insulators
On 12/15/2015 01:06 PM, Andre VanWyk via TowerTalk wrote:
I am getting parts together for a 160m vertical, using Rohn 25G sections.
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