# diphenyl dimethyl polysiloxane — GC column stationary phase cross-reference by manufacturer For diphenyl dimethyl polysiloxane, usp g-code(s) is G32; restek equivalents is Rtx-20; supelco/merck equivalents is SPB-20; quadrex equivalents is 007-20, verified against its source on 2026-08-15. - **Phase chemistry:** diphenyl dimethyl polysiloxane _(verified: appears in the quote below)_ - **USP G-code(s):** G32 _(verified: appears in the quote below)_ - **Restek equivalents:** Rtx-20 _(verified: appears in the quote below)_ - **Supelco/Merck equivalents:** SPB-20 _(verified: appears in the quote below)_ - **Quadrex equivalents:** 007-20 _(verified: appears in the quote below)_ - **Agilent equivalents:** CP-Sil 8 CB, DB-5, HP-5 _(per restek.com, not stated by the source above)_ - **Phenomenex equivalents:** ZB-5 _(per restek.com, not stated by the source above)_ - **SGE/Trajan equivalents:** BP5 _(per restek.com, not stated by the source above)_ - **Macherey-Nagel equivalents:** OPTIMA 5 _(per restek.com, not stated by the source above)_ ## What the source says > Rtx-20 | diphenyl dimethyl polysiloxane | G32 | | | | | SPB-20 | 007-20 ## Sources disagree More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from. ### USP G-code(s) restek.com says usp g-code(s) is **G32**, as of 2026-08-15. > Rtx-20 | diphenyl dimethyl polysiloxane | G32 | | | | | SPB-20 | 007-20 Source: https://www.restek.com/articles/gc-column-cross-reference restek.com says usp g-code(s) is **G27, G36**, as of 2026-08-15. > Rtx-5 | diphenyl dimethyl polysiloxane | G27, G36 | CP-Sil 8 CB, DB-5, HP-5 | BP5 | ZB-5 | OPTIMA 5 | Equity-5, SPB-5 | 007-5 Source: https://www.restek.com/articles/gc-column-cross-reference discover.restek.com says usp g-code(s) is **G27, G36**, as of 2026-08-15. > Rtx-5MS | diphenyl dimethyl polysiloxane | G27, G36 | CP-Sil 8 CB, DB-5, HP-5, HP-5ms, Ultra-2 | | ZB-5, ZB-5MS | | Equity-5, SPB-5 | | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says usp g-code(s) is **G27, G36**, as of 2026-08-15. > Rxi-5HT | diphenyl dimethyl polysiloxane | G27, G36 | DB-5ht, VF-5ht | HT5 | ZB-5HTinferno | OPTIMA 5HT | | 007-5HT | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says usp g-code(s) is **G42**, as of 2026-08-15. > Rtx-35 | diphenyl dimethyl polysiloxane | G42 | HP-35, DB-35 | | ZB-35 | | SPB-35 | 007-35 | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says usp g-code(s) is **G3**, as of 2026-08-15. > Rxi-17 | diphenyl dimethyl polysiloxane | G3 | DB-17 | | ZB-50 | OPTIMA 17 | | | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says usp g-code(s) is **G27, G36**, as of 2026-08-15. > MXT-5 | diphenyl dimethyl polysiloxane | G27, G36 | DB-PS5, VF-5ht UltiMetal | | | | | UAC-5, UAC-5MS | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart ### Restek equivalents restek.com says restek equivalents is **Rtx-20**, as of 2026-08-15. > Rtx-20 | diphenyl dimethyl polysiloxane | G32 | | | | | SPB-20 | 007-20 Source: https://www.restek.com/articles/gc-column-cross-reference restek.com says restek equivalents is **Rtx-5**, as of 2026-08-15. > Rtx-5 | diphenyl dimethyl polysiloxane | G27, G36 | CP-Sil 8 CB, DB-5, HP-5 | BP5 | ZB-5 | OPTIMA 5 | Equity-5, SPB-5 | 007-5 Source: https://www.restek.com/articles/gc-column-cross-reference discover.restek.com says restek equivalents is **Rtx-5MS**, as of 2026-08-15. > Rtx-5MS | diphenyl dimethyl polysiloxane | G27, G36 | CP-Sil 8 CB, DB-5, HP-5, HP-5ms, Ultra-2 | | ZB-5, ZB-5MS | | Equity-5, SPB-5 | | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says restek equivalents is **Rxi-5HT**, as of 2026-08-15. > Rxi-5HT | diphenyl dimethyl polysiloxane | G27, G36 | DB-5ht, VF-5ht | HT5 | ZB-5HTinferno | OPTIMA 5HT | | 007-5HT | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says restek equivalents is **Rtx-35**, as of 2026-08-15. > Rtx-35 | diphenyl dimethyl polysiloxane | G42 | HP-35, DB-35 | | ZB-35 | | SPB-35 | 007-35 | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says restek equivalents is **Rxi-17**, as of 2026-08-15. > Rxi-17 | diphenyl dimethyl polysiloxane | G3 | DB-17 | | ZB-50 | OPTIMA 17 | | | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says restek equivalents is **Rtx-65**, as of 2026-08-15. > Rtx-65 | diphenyl dimethyl polysiloxane | | | | | | | 007-65HT | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says restek equivalents is **MXT-5**, as of 2026-08-15. > MXT-5 | diphenyl dimethyl polysiloxane | G27, G36 | DB-PS5, VF-5ht UltiMetal | | | | | UAC-5, UAC-5MS | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says restek equivalents is **MXT-65TG**, as of 2026-08-15. > MXT-65TG | diphenyl dimethyl polysiloxane | | CP-TAP-CB Ultimetal | | | | | UAC-65HT | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart ### Supelco/Merck equivalents restek.com says supelco/merck equivalents is **SPB-20**, as of 2026-08-15. > Rtx-20 | diphenyl dimethyl polysiloxane | G32 | | | | | SPB-20 | 007-20 Source: https://www.restek.com/articles/gc-column-cross-reference restek.com says supelco/merck equivalents is **Equity-5, SPB-5**, as of 2026-08-15. > Rtx-5 | diphenyl dimethyl polysiloxane | G27, G36 | CP-Sil 8 CB, DB-5, HP-5 | BP5 | ZB-5 | OPTIMA 5 | Equity-5, SPB-5 | 007-5 Source: https://www.restek.com/articles/gc-column-cross-reference discover.restek.com says supelco/merck equivalents is **Equity-5, SPB-5**, as of 2026-08-15. > Rtx-5MS | diphenyl dimethyl polysiloxane | G27, G36 | CP-Sil 8 CB, DB-5, HP-5, HP-5ms, Ultra-2 | | ZB-5, ZB-5MS | | Equity-5, SPB-5 | | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says supelco/merck equivalents is **SPB-35**, as of 2026-08-15. > Rtx-35 | diphenyl dimethyl polysiloxane | G42 | HP-35, DB-35 | | ZB-35 | | SPB-35 | 007-35 | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart ### Quadrex equivalents restek.com says quadrex equivalents is **007-20**, as of 2026-08-15. > Rtx-20 | diphenyl dimethyl polysiloxane | G32 | | | | | SPB-20 | 007-20 Source: https://www.restek.com/articles/gc-column-cross-reference restek.com says quadrex equivalents is **007-5**, as of 2026-08-15. > Rtx-5 | diphenyl dimethyl polysiloxane | G27, G36 | CP-Sil 8 CB, DB-5, HP-5 | BP5 | ZB-5 | OPTIMA 5 | Equity-5, SPB-5 | 007-5 Source: https://www.restek.com/articles/gc-column-cross-reference discover.restek.com says quadrex equivalents is **007-5HT**, as of 2026-08-15. > Rxi-5HT | diphenyl dimethyl polysiloxane | G27, G36 | DB-5ht, VF-5ht | HT5 | ZB-5HTinferno | OPTIMA 5HT | | 007-5HT | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says quadrex equivalents is **007-35**, as of 2026-08-15. > Rtx-35 | diphenyl dimethyl polysiloxane | G42 | HP-35, DB-35 | | ZB-35 | | SPB-35 | 007-35 | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says quadrex equivalents is **007-65HT**, as of 2026-08-15. > Rtx-65 | diphenyl dimethyl polysiloxane | | | | | | | 007-65HT | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says quadrex equivalents is **UAC-5, UAC-5MS**, as of 2026-08-15. > MXT-5 | diphenyl dimethyl polysiloxane | G27, G36 | DB-PS5, VF-5ht UltiMetal | | | | | UAC-5, UAC-5MS | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart discover.restek.com says quadrex equivalents is **UAC-65HT**, as of 2026-08-15. > MXT-65TG | diphenyl dimethyl polysiloxane | | CP-TAP-CB Ultimetal | | | | | UAC-65HT | Source: https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart ## Source - https://www.restek.com/articles/gc-column-cross-reference - https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart - https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart - https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart - https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart - https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart - https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart - https://discover.restek.com/articles/gnot3472/gc-column-cross-reference-chart Last verified: 2026-08-15. Review by: 2027-08-15. Part of [GC column stationary phase cross-reference by manufacturer](https://referencesource.org/lab-instrument-consumables-equivalence/).