I am looking to create very fine particulate from a medical-grade
polyester fiber (Vascutek Twillweave:
http://www.vascutek.com/usa/index1.htm).  My target paticle size is
0.5 - 20 um, with 95% < 5 um.  I need a very small amount of output
material (<1g), but it must be virtually uncontaminated by the size
reduction process.

Can you help me find a vendor who has experience with projects of this
sort, and can accomplish the task?

Hi Kincade

What if the fiber were frozen in distilled water and a microtome used
to section the block. The water could then be allowed to evaporate. I
would think you could get a very uniform particle length. Pathology
labs almost everywhere should be able to do it, you could enquire
locally as to the feasibility and cost.