Low thermal expansion board material
Low thermal expansion board material
(OP)
Hi,
I am looking for a material in solid sheet (or solid board) form:
- Thickness: Between 1/4 and 1/2 inches,
- Continious working temperature: 180F, no outgassing at this temperature
- Water proof, no or very low absorbance of water,
- Machineable with std tools,
- Accepts/adheres with silicone based adhesives, (after primer application),
- Very low Linear thermal expansion, close to glass, which is around 9 (10-6 m/(m K)
- Thermal insulation is a plus,
- Electrically insulative, and no metals or carbon in material,
- Commercial availability and acceptable cost,
Questions welcomed,
Thanks in advance, I appreciate all thoughts, suggestions and questions,
Jakelian
I am looking for a material in solid sheet (or solid board) form:
- Thickness: Between 1/4 and 1/2 inches,
- Continious working temperature: 180F, no outgassing at this temperature
- Water proof, no or very low absorbance of water,
- Machineable with std tools,
- Accepts/adheres with silicone based adhesives, (after primer application),
- Very low Linear thermal expansion, close to glass, which is around 9 (10-6 m/(m K)
- Thermal insulation is a plus,
- Electrically insulative, and no metals or carbon in material,
- Commercial availability and acceptable cost,
Questions welcomed,
Thanks in advance, I appreciate all thoughts, suggestions and questions,
Jakelian





RE: Low thermal expansion board material
This bunch have a lot of similar options: http://www.par-group.co.uk/high-temperature-insula... and so do Tufnol (they call it 10G) http://www.tufnol.com/materials-full/glass-fabric-...
The CTE of glass/epoxy is often quite hard to bottom out. I reckon it's between 11 and 16 microstrain/K in-plane (a bunch more out-of-plane, about 40 µε/K). Tufnol seem to claim 12 in-plane.
It should absorb maybe 1% water by weight if exposed hot/wet 'til equilibrium. The above suppliers seem to like to quote mg/unit area and given thickness.
A short glass fiber reinforced plastic might be similar, but I suspect higher CTE. If a thermoplastic is used (not nylon which will guzzle a lot of water) a lower moisture absorption should result.
It should machine ok but will give more wear than you might think.
G-10 is also quite cheap.
RE: Low thermal expansion board material
Thank you very much for your attention and effort.
I am reviewing the info you sent me,
Thanks a lot ))
Jakelian