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The phrase "are impregnated" is correct and usable in written English.
It can be used in contexts related to the process of becoming pregnant or in a metaphorical sense, such as when discussing materials that have been infused with a substance.
Example: "The seeds are impregnated with nutrients to enhance their growth potential."
Alternatives: "are infused" or "are saturated".
Dictionary
Exact(60)
When M825 rounds explode, they jettison roughly 115 felt wedges that are impregnated with white phosphorus.
All the women in the village of Midwich are impregnated in a single night by aliens.
(Carbon and aramid fibers, once knotted, are impregnated with epoxy resin).
Procter & Gamble's paper sheets are impregnated with detergent and a bleaching agent.
The second generation, however, lives in the larvae of the same beetle, and the females are impregnated by males.
These start out as fibres of carbon, which are knitted together into fabrics that are impregnated with resin to give them rigidity.
As added protection, the Handler's rubber and plastic surfaces are impregnated with tiny particles of silver to kill germs that land on the device itself.
The sands are impregnated with oil, but extracting that oil is a much more difficult and expensive process than traditional drilling.
The reinforcements are impregnated with a commercial polyester resin mixture (Atlac 382).
This occurs when the pores of the plant materials, bones, and shells are impregnated by mineral matter from the ground, lakes, or ocean.
In spite of Johnson's attacks on Wood, it is apparent that so-called Johnson delegations are impregnated with Wood sentiment.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com