PTFE Pall Ring combines fluoropolymer material with open Pall Ring geometry and is represented in DAIER's engineering database in 25, 38 and 50 mm sizes. Selection should first confirm whether PTFE is genuinely required by the process chemistry and temperature, then balance contacting intensity, hydraulic openness, fouling, tower diameter and support requirements.

PTFE Raschig Ring is a specialized random packing available in DAIER's verified database in approximately 20–76 mm sizes. Smaller models provide greater specific surface area, while larger models reduce element count and create larger characteristic passages; final selection should first justify PTFE from the actual chemistry and temperature, then evaluate size, hydraulics, fouling, tower diameter and support loading.

Plastic Beta Ring is an open molded plastic random packing currently verified in 25, 50 and 76 mm sizes. DAIER's catalog confirms 94–96% free volume and 38–54 kg/m³ bulk density; final selection should consider tower diameter, hydraulic load, fouling and polymer compatibility, while manufacturer-specific surface-area or packing-factor values should be confirmed rather than assumed.

Carbon / Graphite Raschig Ring is a specialized random packing family available in DAIER's verified database in approximately 19–50 mm sizes. Smaller rings provide greater specific surface area, while larger models reduce element count and can provide a more open bed; final selection must also confirm the exact carbon/graphite grade, chemical compatibility, operating temperature, fouling condition and mechanical support requirements.

Ceramic Y-Type Partition Ring is a 25–80 mm partitioned ceramic random packing family whose Y-shaped internal structure increases contacting surface while creating additional internal flow passages. Selection should consider actual size-specific data, mass-transfer requirements, fouling, ceramic compatibility, tower diameter and support load rather than assuming performance trends from nominal size alone.