Profile: Paper Research Materials, Inc. specializes measurement of retention, drainage, and pulp fines fractions. We provide various types of jar which are equipped with different units. Our products include DDJ#1, DDJ#2, DDJ#3 and DDJ#4. Our DDJ#1 comprises of three piece jar assembly, aluminum back-up screen, set of gaskets, laboratory support stand, control, shaft & propeller unit and flow control assembly. Our DDJ#2 comprises of a jar barrel which is fitted with three vertical vanes for increased turbulence. This is used for matching retention of tissue and twin-wire machines.