I currently work to the Airbus spec which calls up for the ASTM E-11 and use S170R and S230R, the machine is fitted with a Sweco separator model us48c6666 and the screen size for ths S170 is micron .470 wire diametre .165 on a 48" screen.
I get very good results using these size screens using the same sieves for testing as in your e-mail.
If you need any further asistance please get in touch.
