Brass frame/stainless steel wire cloth wash sieves are manufactured to meet and exceed ASTM E11, ANSI, and ISO Specifications. Inspected with an image analyzer which is fully traceable to the National Institute of Standards and Technologies (NIST). This inspection guarantees accuracy of opening sizes and wire diameters for precise and repeatable results. Die-formed frames assure fit and superior quality. Included with each sieve is a Certificate of Compliance to all applicable ASTM, ISO and ANSI specifications bearing the serial number of your sieve and the shipment date. #20 calendered stainless steel support cloth is available for all wash sieves. Calibration services available.