I would appreciate any advice on a suitable material to use for Chroma Keying.
Several points to consider...
Probably most important is to use a color that does not appear in your foreground clip unless you want holes in people etc.
From what I've read on other forums the more uniform the color the better the result -- no folds, wrinkles or uneven lighting.
Choice of material isn't MEP specific; try a google search on chroma key best material and you'll find lots of suggestions.
You can buy a Chroma-Key screen, but they are at a healthy price.
http://www.studiodynamics.com/search/chroma%20key
My first screen is just a bright fluorescent green fabric that I bought at a fabric store. The most important part for Chroma-key to look good is lighting. You could also use paint... regardless, you want a surface that is not reflective of light, fabric is good because you can take it down and store it, you would just need to see if you can get that green at a fabric store. You can also use blue, but I find that a lot of my subjects have blue on, so this does not work as well for me.
Your lighting cannot allow shadows, so you need a lot of lights. Professional light kits are also pricey and fluorescent lighting is bad...