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So, i don't know if someone has already pointed this out, but I was re-reading Eisenhorn Malleus today and I came across this:

" 'I wish we had more. We could blow the wall right through.'
'We could, brother-sergeant, but this might be better.'
'Why?'
'Because if we can simply make this projector fail, the energies of the shield will short out before they collapse. Rather than blowing outwards, that'll cause an electromagnetic pulse within the field itself. And I think an EM pulse is the last thing Esarhaddon wants right now.' "


" Our minds were harder to attack, especially given the shield formed by the rock above us and our proximity to the energy flux of the (void) shield. "

"WITH THE GENERATING projector killed, the void shield collapsed in on itself, blacking out the palace systems with the thunderclap of electromagnetic rage.
Blacking out Esarhaddon's seething mind too.
My research into untouchables, through Alizebeth and then through the Distaff she created and ran, had indicated to me that perhaps psychic power, no matter how potent, relied in the final analysis on the electrical workings of the human mind, the firing of impulse charges between synapses. Untouchables somehow blanked this, and triggered a disturbing and disarming vacancy in the natural and fundamental processes of the human brain. That, I had initially concluded, was why psykers don't work around untouchables... and why forgetfulness and unease is prevalent in their company. And, ultimately, why they disturb and upset humans so, and psykers doubly so.
I'd turned the old void shield into a brief, bright untouchable event.
And now, Emperor damn him, the heretic psyker Esarhaddon, temporarily rendered deaf, blind and mute, was mine.
EIGHT"

PS; Eisenhorn Malleus last few paragraphs of chapter 7.





So this implies EMP's and any big chunk of electrical insulator material (rock, etc) could stop or at least attenuate psychic powers. And maybe metals (a metal wall for example) could conduct psychical powers in the same way.

Remember that Void Shields are a Warp-based technology. This has a lot to do with why they can disrupt psychic powers. Also, EM emissions of sufficient power and frequency can cause neurological damage to human beings, so it is not beyond reason that they could be used against psykers.

However, Void Shield Generators are rare, and not likely to be available to any but the absolute wealthiest of Under-Hive criminals.

 Sgt_Smudge wrote:
There may be more Blanks than Astartes, but how many survive to adolescence?

More than the number of Astartes who survive to full maturity.