CORK: Diffuse or Absorb?

I bought these cork bath mats a while ago. I use them over a window just to the right of my speaker and duplicate this on the left side. I just bought a Vicoustic diffusion panel, the Multi-fusor wood 36, and mounted it in back center of my speakers. I very much like what diffusion does in my room, and want to do ad more. So back to the original question.... Does anyone know if Cork absorbs or diffuses?