Micro-Perforated Materials
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I've had an extreme need for non-"cheat" materials that block particles but allow pressure. I'm aware that when TTAN is charged, it allows air, but I need other materials as well. Micro-Perforated materials would fill that gap, making a material block particles but not air. Because of the microscopic holes, they would be slightly less tolerant to heat, but would be almost invulnerable to pressure. If they are melted and cooled again, they would become solid; no longer perforated. They would have their own category in the list of materials to avoid confusion. Here are a few of them:
MPTT - Titanium
MPTN - Tungsten
MPIR - Iron
MPQT - Quartz
etc.
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Pretty much all particles allow some air past them. How much air they block varies between materials (I don't know off the top of my head which ones offer the least resistance to air though), and a larger quantity of material will be more effective at blocking air. But nothing blocks air completely except TTAN and walls.
Try drawing a box and using the AIR tool (or some high temperature PUMP) in the middle, while watching in air velocity view ('1' key). Placing a small amount of DUST on the top of the box can also be a good way of seeing the air flow. For thick walls, it may take a while for the pressure to start leaking through.
I don't think we're going to add a copy of each solid, but perhaps you could explain a bit further why you need materials that block particles but not air?
There is a wall that blocks particles but allows air to pass through freely.
