Supporting ribs beneath the cloth of Trays with openings from 1.18mm to 75µm prevent sagging and stretching. Trays with cloth finer than 63µm use No.4 stainless steel Backing Cloth for full support in place of ribs. Backing Cloth is optional for other fine screen trays and is recommended to increase service life of the main cloth. Replacement Cloth sections ready for installation are available in ISO sizes, and Blank Trays can be ordered to replace trays with damaged frames. Dimensions for Testing Screen Cloth Only are 16x24in (406x609mm).
Wire Cloth for Full Trays and replacement units in sizes 4.25in and larger and 112mm and larger is not woven, so does not strictly meet ASTM E11 or ISO 565/3310-1 specifications.
Optional verification of Screen Tray opening sizes to ISO Inspection or Calibration Grades upgrades the standard deviation confidence level from 66% at Compliance Grade to 99.0% for Inspection, and 99.73% for Calibration Grades. To specify Inspection or Calibration Verification Services, please select from the Tray Verification drop down menu. Screen trays fitted with Backing Cloth cannot be verified.