2.4 KiB
--- WORK IN PROGRESS RESOURCE! DO NOT USE IN PRODUCTION! ---
This is a list of materials that are acceptable for the chamber construction:
Acknowledgements
The standard biggest wall is 1000x800 mm with pressure of 25 Pascals and projected use of heated magnetic stirrer set to max temperature 393.15 K (120 C) in an enviroment where it may be exposed to various chemicals, thus the requirements are set as follows:
Transparent solid material plate 1200x1000 mm with thickness ranging from 1.00 mm to 3.00 mm (max 5.00 mm) with weight less than 2 kg in a common earth environment subjected to pressure of 35 Pascals at continuous operating temperature 423.15 K (150 C) not surpassing plasticity (permanent deformation of the material) with displacement less than 0.50 μm for at least 10 minutes with chemical resistance to common chemical substances. Non-transparent material may be used with combination of transparent material for the Window plate to enable operation.
Compatible Materials
Poly Ether Ether Ketone (PEEK)
Material is compatible with requirements, but may require additives for transparency[1] or use with transparent material for window plate.
Polyetherimide (PEI)
Amber-to-transparent solid, may not be a good option if it's transparency impairs operation which is unlikely to do.
It is prone to stress cracking when exposed to chlorinated solvets[2], if application includes these then it's chemical markup needs to be handled appropriately (additives to manage this issue).
Polysulfone (PSU)
Material is compatible with requirements, but note that it is known to dissolve in dichloromethane and methylpyrrolidone[3].
Incompatible materials
Acrylate polymer (acrylic glass)
It's Continuous Operating Temperature is around 348.15 K (75 C) which is not suitable for the use with heater element inside the acrylic for a long period of time. Projected failure is plasticity if the chamber is pressurized or formation of bubbles due to the overheat of the material.
References
- Research paper on "Transparency enhancement in semicrystalline PEEK through variation of polymer morphology" -- https://onlinelibrary.wiley.com/doi/10.1002/(SICI)1099-0488(199603)34:4%3C707::AID-POLB11%3E3.0.CO;2-L
- Wikipage on the properties of Polyethermide -- https://en.wikipedia.org/wiki/Polyetherimide#Properties
- Wikipage on the properties of Polysulfone -- https://en.wikipedia.org/wiki/Polysulfone#Properties