You may want to try some of the flat black "stove paint" available at many hardware stores.
It is also very heat resistant and retains its color after many years of solar exposure.
Perhaps you can get around the contact issue by use of mercury whetted relays. I incorporated them in some low level current switching gear in about 1988 and have had no trouble with them operating at current levels from 1 uA to 10 mA. The voltage was below 1 volt but the offset was much below...
Look for tech information by John Pepi who has studied this topic re damage to glass
separate comment: I do not think there is usually a gap above the solar cell, clear adhesive used
Not too young to know about ----
This wandering of the arc has been much more pronounced in the past year or two of the thirty years of use under our belts.
My suspicion is a change in the cathode tip processing and the uniformity of the materials. This was observed in two different, but...
The arc of 4 to 5KW high pressure Xenon lamps originate at the cathode tip.
In operation, the visible arc of our Osram lamps "wanders" with the consequence that the intensity
via our optics fluctuates up to a few percent (we image the arc onto a pinhole and collimate with a parabola).
The lamp...
some silicones remain resilient to about -130C and probably would serve as seals
RTV 566 and some by Nusil will meed this type of application
if the gap is small consider Indium seals, they remain compliant at LN temperatures if designed corectly
why do you need the high emissivity?
anodizing the aluminum will have a limiting emissivity of about 0.6 if quite thick
Sheldahl makes thermal control tapes
need to specify temperature range
do you need specific absorbance requirements?
Cheveron was non-responsive
if RYTON only "softens" at up to 350C, my application as a thermally insulating support for a heatshield in a zero g vacuum (space) should suffice.
thanks for response
Some additional testing will be required (but not at zero g)
the bearing grade (carbon filled)...
Ryton PPS bearing grade must change significantly at very high temperatures, above 300 C
Where can I get data on mechanical properties for this temperature ?
Nothing useful from polymer supplier was forthcoming.
Does this material degrade gracefully, get soft or turn to ??
I need only modes...
I need a materials for a small flexure with very low thermal conductivity that will survive +250C and have maximum strength. Also need to provide discharge path for static electricity and be machinable.
Suggestions please.
