REX,OPERATING STANDS ,OS-4

Smaller versions of the OS-1 stand, the OS-2 and OS-4 provide a convenient and accurate way to perform repeated hardness tests. All stands provide the correct testing pressure as noted in ASTM D-2240, thus eliminating human error. The OS-2 can be used for type A, B, O and E, while the OS-4 is for use with types OO and OOO.

The OS-2H, OS-3 and OS-4H offer all the features of the standard Rex OS-2 and OS-4 stands, plus a dampening feature. The dampener lowers the durometer at the same rate for each test, resulting in superior repeatability for all durometer tests (especially in the sensitive OO, OOO and M durometer types). The OS-2H can be used for durometer types A, B, O and E. The OS-3 is used only for type M durometers, and is ideal for o-ring testing (o-ring fixtures are available). The OS-4H is for use with the OO and OOO durometer types.