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R-ring is the equivalent of metal Raschig ring.

Since 1914 when F.Raschig invented this type of ring for tower packing, random tower pickings have been developed extensively. The T.C.I R-ring is now used in many applications, but particularly in supporting catalyst beds.
Metal T.C.I -R-rings are available in a wide range of carbon and stainless steels.and ceramic, PTFE, PP, etc.
raschig ring
Metal Raschig rings’ characteristics
Size
(mm)
Bulk density
(kg/m3)
Number
per m3
Surface area
(m2/m3)
Free volume
15×15×0.3 379 230000 350 95
25×25×0.4 318 51000 216 96
25×25×0.5 400 51000 220 95
35×35×0.8 430 19000 150 93
50×50×0.5 203 6500 106 97.4
50×50×0.7 285 6500 108 96.4
50×50×0.8 325 7000 109 95
76×76×0.8 212 1830 69 97.3
80×80×1.2 300 1600 65 96
90×90×1.0 236 1160 62 97
All of the given weights refer to the stainless(AISI304)
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