What material is used to make the engine shrouds for passenger airliners?
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Welcome to Aviation.SE! I've edited out the extra words in your question, in order to make it clearer. But you can revert back to the original version if you want. : ) – Nov 21 '17 at 16:55
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If you mean material for the casing, then aluminum or polymer matrix materials, see What material is used to make the hot sections of jet engines? – mins Nov 21 '17 at 19:03
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There are potentially two answers to this question
If you are asking about engine covers used to keep debris out when the aircraft is parked like these
(source)
They are made out of any manner of fabric, nylon, canvas and often foam filled if they are inserted somewhere.
If you are asking about the exterior housing around an engine its generally aluminum like the rest of the aircraft. Much like the open panels that can be seen here.
(source)
Dave
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2The fan cowls in your second picture are usually aluminum, but composites can also be involved, especially for the thrust reversers. – fooot Nov 21 '17 at 18:42
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3Engine cowlings are composite on anything half-modern, not aluminum. Some versions of the 737 use composite, as well as 757/767 forward. All the engine cowlings on Airbuses are composite. – user71659 Nov 21 '17 at 19:59
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1Most of the aluminum in modern engine cowlings (what you call housings) is in the honeycomb sandwich cores. – Peter Kämpf Nov 21 '17 at 22:55
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1What specific material are Water Vapour Resistant (WVR) engine bags made from? – Nov 22 '17 at 15:53