Once past the inexplicable source of the original question, the use of low-tech "non strategic" materials in modern aerospace systems seems like a question worthy of some discussion. A few things spring to mind:
1) Some Chinese recoverable satellites used wood heat shields... successfully.
2) Trident SLBMs use an "aerospike" that projects from the nose to create a shockwave ahead of the necessarily stubby nosecone (a pointed nosecone would make the missile too long to fit in the sub). The aerospike has a slab of spruce that works as a heat shield.
3) The interior of the liquid hydrogen tank on the Delta Clipper was lined with balsa.
4) I have dim recollections of wooden spacers being used to separate cryogenic tanks and/or heat shields from surrounding structures
5) In my rocket designing days, I proposed using consumable wood bits on a particular program, but plastic would up working better
Nothing else immediately springs to mind.