Lower Temperature Material and Lubricant?

I'm looking for lower temperature material as pipe, tube, flange, and so on relevant to its under around -40℃ ambient temperature.

Also, for lower temp. I'm trying to fine seal parts, oils and greases for hydraulic fluid.

I've known that seal parts are compatible with lubricants like oils,greases in case of lower temp. environment.

could you pls recommend proper suppliers or knowledge for me?

Hope to be Your Friend,

Park.