No, not silk. SiLK. (Score 5)

SiLK is a commercial product from Dow:

"SiLK Semiconductor Dielectric resins developed by The Dow Chemical Company are new, low-k polymers for use as an interlayer dielectric (ILD) material for high-performance integrated circuits.

SiLK Dielectric resins offer the lowest commercially available dielectric in the industry." (From Dow's SiLK website.)

I read a much better, more technical, article somewhere yesterday, but I can't find it. Sorry.