ratings for Pall SRT media grades. These values are based on a flow cycling rate of 6 cycles/minute with flow varying from 25% to of rated flow. Table 2 Pall SRT Filter ISOCode Ratings f rom the Cyclic Stabilization Test Pall SRT ISOCODE Rating per Media Grade Cyclic Stabilization Test (80% pressure drop)* AP 12/07/02 AN 15/11/04 AS 16/13/04