Lines and opening types
Straight, Oval, Concealed and Steel lines across casement, door, tilt-turn, hopper, awning, tilt-slide, folding and pivot.
Hinged Systems · Sosoares thermal-break casement family
ST | ST-Steel Casement System
Overview
ST is the best-documented casement system Sosoares publishes, and the one KR reaches for when a project sets a genuine thermal or acoustic target. The thermally optimised 71 mm frame takes selective double or triple glazing from 18 to 54 mm — deep enough to reach Uw 0.96 W/m²K, and to record Rw 45 dB in an independent acoustic test. Four lines sit on the platform. Straight and Oval are the visible-sash lines. ST-Oculta conceals the sash behind a 47 mm face so a casement can be detailed alongside the OS minimalist sliders without breaking the sightline. ST-Steel, a 78 mm line, recreates the proportions of a steel window in thermally broken aluminium.
71 mm thermal-break casement reaching Uw 0.96 W/m²K and Rw 45 dB. Catalogued as "ST | ST-STEEL — Sistema de batente de 71 mm e 78 mm com corte térmico"; lines Straight, Oval, Concealed (ST-Oculta) and Steel (ST-Steel)
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Product highlights
Published Sosoares system characteristics for the ST | ST-Steel:
Product highlights in detail
Dimensional limits
70 to 180 kg per sash by typology; glazing 18 to 54 mm on the visible-sash lines.
Frame and face dimensions
71 mm frame with a 78 mm sash on the visible lines, 70 mm on the concealed line, 78 mm on ST-Steel.
Key system data
- Aluminium: 71 mm
- Face Width: 47 mm
- Max Weight: 180 kg
- Triple Glaze: 0.96 W/m²K
- Double Glaze: 1.35 W/m²K
- Acoustic Cont: Rw 45 dB
- Weather Resist: EN 12208 E1350
- Wind Load: EN 12210 C5
Frame depth is the 71 mm ST fixed frame; ST-Steel is 78 mm. Face width 47 mm is the ST-Oculta concealed-sash face — the visible-sash lines show an 85 mm face. Maximum weight 180 kg applies to the door and tilt-and-turn typologies; other typologies range down to 70 kg. Thermal values are ISO 10077-1/-2:2017 results, Uw 0.96 W/m²K with Ug 0.50 W/m²K triple glazing and Uw 1.35 W/m²K with Ug 1.00 W/m²K double glazing. Acoustic Rw 45 dB (-1;-4;0;-4) is ITeCons ACL 358/20 for ST; ST-Oculta records Rw 42 dB under ACL 168/22. Water E1350 and wind C5 are from ITeCons AEV report CLX 062/15. The ST technical catalogue is dated November 2022 against a 2026 master catalogue, so KR treats these values as provisional and reconfirms them with Sosoares before a submission is signed.
01 — Planning benefit
Planning benefit
ST is selected on glazing depth and sash weight. The 18 to 54 mm glazing range is what makes the low Uw reachable, so fix the glass build-up first, then check the sash against the 70 to 180 kg per-typology limits, then choose the line — visible sash, concealed sash or steel-look.
Lines and opening types
- Lines: Straight and Oval (visible sash), ST-Oculta (concealed sash), ST-Steel (78 mm steel-look).
- Typologies: casement inward or outward opening in 1 or 2 leaves; door; tilt-and-turn; hopper; awning; tilt-and-slide; folding in 3 to 7 leaves.
- A pivot window is documented in Sosoares technical bulletin N0599.1.
- ST-Oculta is designed specifically so a concealed-sash casement can coordinate with the OS minimalist sliding range.
Dimensional limits
- Sash weight, by typology: casement 1–2 leaves 150 kg; door 180 kg; tilt-and-turn 180 kg; tilt-and-slide 160 kg; hopper 130 kg; awning 120 kg; folding 3–7 leaves 80 kg.
- Catalogue summary range: 70–180 kg per sash across ST and ST-Oculta.
- Glazing: 18–54 mm double or triple on ST, ST-Oval and ST-Steel; 28–32 mm on ST-Oculta.
- Hardware channel: European chamber / Channel 16.
Frame and face dimensions
- ST fixed frame: 71 mm (77 and 78 mm variants are also listed on the Sosoares website).
- ST mobile frame: 78 mm on the Straight and Oval lines, 70 mm on the Concealed line.
- Catalogue sections: ST 71/78 mm with an 85 mm sash face; ST-Oculta 71/78 mm with a 47 mm face.
- ST-Steel: 78 mm fixed frame, 85 mm mobile frame, with 47 and 25 mm elements.
- Polyamide thermal break: 39 mm fixed frame, 35 mm mobile frame.
02 — System integration
System integration
ST-Oculta concealed sash — The sash is hidden behind a 47 mm face, which lets a casement sit on an elevation next to an OS minimalist slider without the sightline stepping. ST-Oculta publishes its own acoustic report at Rw 42 dB, but no AEV or thermal result — where those govern, the visible-sash line is specified.
ST-Steel steel-look line — A 78 mm line conceived, in Sosoares' words, to recreate in aluminium the distinctive design of steel frames. It suits heritage, industrial-look and design-led work that wants slim steel proportions with thermal-break performance. Available in lacquered, anodised and bicolour finishes.
Selective triple glazing — The 54 mm upper glazing limit accepts a selective triple build-up, which is what carries the system to Uw 0.96 W/m²K with Ug 0.50 W/m²K. Glass selection is where most of the thermal result is won on this system.
Concealed actuators and hidden tilt-turn kits — Sosoares documents concealed actuators and hidden tilt-and-turn hardware kits for the ST platform. No sash motorisation is published, so none is offered.
Coordination with LT — Where the 71 mm depth is more than a project needs, the 67 mm LT casement shares the same typology logic on a shallower frame. KR runs the comparison at design stage rather than defaulting to one or the other.
03 — Gallery
Gallery
Sections, renders and project photography reproduced from the Sosoares product catalogue. Architect and photographer credits are carried through as published.
Not supplied Further ST photography held back pending clearance
Two more ST frames appear in the catalogue. One merges two separate projects and two photographers into a single caption, so an individual frame cannot be attributed. The other names a project that does not appear in the official Sosoares imagery record. Both are withheld until written clearance and a corrected credit are obtained.
04 — Awards & accreditations
Awards & accreditations
CE marking to EN 14351-1:2006+A1:2010.
ITeCons AEV test report CLX 062/15: air permeability class 4, watertightness class E1350, wind resistance class C5.
ITeCons acoustic test report ACL 358/20 for ST: Rw 45 dB (-1;-4;0;-4), Rg 49 dB (-2;-6).
ITeCons acoustic test report ACL 168/22 for ST-Oculta: Rw 42 dB (-2;-5;-1;-5), Rg 43 dB (-2;-5).
Thermal transmittance calculated to ISO 10077-1:2017 and ISO 10077-2:2017.
ST-Steel is CE marked to NP EN 14351-1 with air class 4 (EN 12207:2000), watertightness E1350 (EN 12208:2000) and wind class C5 (EN 12210:2000), tested on a 1.60 × 2.10 m two-sash window. No independent AEV or acoustic report is published for ST-Steel alone.
No AEV or thermal result is published for ST-Oculta; only its acoustic report is available, and no other figure is claimed for that line.
The ST technical catalogue is dated November 2022. KR treats its values as provisional against the 2026 master catalogue and reconfirms them with Sosoares before a technical submission is signed.
Qualicoat Seaside powder-coating and Qualanod anodising quality marks apply to the Sosoares surface-treatment plant that finishes these profiles.
Test classifications quoted here are the European and Portuguese results published by Sosoares. They are not Australian certifications; KR confirms project compliance against the relevant Australian standards and the project wind study at tender stage.
Who makes this
Grupo Sosoares originates from "Sosoares – Máquinas e Ferragens, Lda.", founded in 1979, and today comprises four companies (Sosoares S.A., Alfa Sul S.A., Alulider Lda., Portalex S.A.) covering design, development, production and commercialisation of aluminium frames and glass systems under the own brand "Sistemas Euro 2000®".
05 — Technical information
Technical information
Figures are published Sosoares system maxima, minima and test results, stated with the standard or test reference under which they were determined. Project values depend on configuration, glazing build-up and installation, and are confirmed by KR at tender.
Dimensions and profile
Frame and sash dimensions vary by line. Face width is the visible sash face.
| ST fixed frame | 71 mm (77 | 78 mm variants also listed) |
|---|---|
| ST mobile frame — Straight, Oval | 78 mm |
| ST mobile frame — Concealed | 70 mm |
| ST sash face — visible lines | 85 mm |
| ST-Oculta sash face | 47 mm |
| ST-Steel fixed / mobile frame | 78 / 85 mm, with 47 and 25 mm elements |
| Glazing — ST, ST-Oval, ST-Steel | 18–54 mm, double or triple |
| Glazing — ST-Oculta | 28–32 mm |
| Hardware channel | European chamber / Channel 16 |
| Polyamide — fixed / mobile | 39 / 35 mm |
| Sash weight — casement 1–2 leaves | 150 kg |
| Sash weight — door | 180 kg |
| Sash weight — tilt-and-turn | 180 kg |
| Sash weight — tilt-and-slide | 160 kg |
| Sash weight — hopper | 130 kg |
| Sash weight — awning | 120 kg |
| Sash weight — folding, 3–7 leaves | 80 kg |
| Sash weight — ST-Steel range | 130–180 kg by typology |
Tested performance
ITeCons results for the visible-sash ST line. ST-Oculta and ST-Steel publish only the subsets shown.
| AEV report | ITeCons CLX 062/15 |
|---|---|
| Air permeability | Class 4 (EN 12207) |
| Watertightness | Class E1350 (EN 12208) |
| Wind resistance | Class C5 (EN 12210) |
| Uw — triple glazing | 0.96 W/m²K (Ug 0.50 W/m²K) |
| Uw — double glazing | 1.35 W/m²K (Ug 1.00 W/m²K) |
| Uw — ST-Steel, triple / double | 0.97 / 1.36 W/m²K |
| Acoustic report — ST | ITeCons ACL 358/20 |
| Rw / Rg — ST | 45 dB (-1;-4;0;-4) / 49 dB (-2;-6) |
| Acoustic report — ST-Oculta | ITeCons ACL 168/22 |
| Rw / Rg — ST-Oculta | 42 dB (-2;-5;-1;-5) / 43 dB (-2;-5) |
| AEV / thermal — ST-Oculta | Not published — no value is claimed |
| AEV / acoustic — ST-Steel alone | No independent report; CE classification per NP EN 14351-1 only |
| Security rating | Not published for ST — no RC class is claimed |
| Motorisation | Not published — concealed actuators and hidden tilt-turn kits only |
Materials and finishes
Aluminium with polyamide thermal break; ST-Steel adds a bicolour option.
| Frame material | Aluminium with 39 / 35 mm polyamide thermal break |
|---|---|
| Gaskets | EPDM |
| Finishes | Lacquered, anodised or bicolour; Qualicoat Seaside and Qualanod marks apply |
| CE marking | EN 14351-1:2006+A1:2010 |
06 — Documentation
Documentation
Sosoares publishes the ST | ST-Steel technical documentation openly. KR holds current editions as Sosoares' Australian partner and will supply the relevant sheets for a nominated project.
ST technical catalogue (v04nov2022)
Published by Sosoares. Opens in a new tab.
ST-Steel presentation brochure
Published by Sosoares. Opens in a new tab.
Sosoares ST product page
Published by Sosoares. Opens in a new tab.
Sosoares ST BIM object index (trade login required)
Published by Sosoares. Opens in a new tab.
Request the full ST | ST-Steel documentation from KR Contact page
07 — Specification texts
Specification texts
Specification summary for the Sosoares ST | ST-Steel. The complete, tender-ready specification text is issued by KR for a nominated project.
- Thermal-break aluminium casement system, 71 mm fixed frame with 78 mm mobile frame on the visible-sash lines, 39 mm and 35 mm polyamide thermal break.
- Glazing 18–54 mm, double or triple, on a European chamber / Channel 16 hardware groove.
- Typologies: casement inward or outward in 1 or 2 leaves, door, tilt-and-turn, hopper, awning, tilt-and-slide and folding in 3 to 7 leaves.
- Sash weight to 180 kg on door and tilt-and-turn typologies; refer to the per-typology schedule for all other configurations.
- Air permeability class 4, watertightness class E1350 and wind resistance class C5 to ITeCons report CLX 062/15, CE marked to EN 14351-1:2006+A1:2010.
- Thermal transmittance Uw 0.96 W/m²K with Ug 0.50 W/m²K triple glazing, or Uw 1.35 W/m²K with Ug 1.00 W/m²K double glazing, to ISO 10077-1/-2:2017.
- Airborne sound reduction Rw 45 dB (-1;-4;0;-4) and Rg 49 dB (-2;-6) to ITeCons report ACL 358/20.
- Where a concealed sash is required, substitute ST-Oculta with a 47 mm face and 28–32 mm glazing; its published acoustic result is Rw 42 dB and no AEV or thermal figure is available for that line.
- Where steel-window proportions are required, substitute ST-Steel at 78 / 85 mm; Uw 0.97 W/m²K triple or 1.36 W/m²K double, CE marked to NP EN 14351-1.
- Values are drawn from the ST technical catalogue dated November 2022 and are to be reconfirmed with the manufacturer before the technical submission is signed.
- Finish: lacquered, anodised or bicolour; Qualicoat Seaside and Qualanod quality marks apply.
- Fabrication, installation and commissioning by KR Installations, Australia wide.
08 — CAD data
CAD data
On request BIM and CAD objects for the ST | ST-Steel system are available on request from KR Installations.
KR issues the relevant sections, jamb and sill details for a nominated project, and can arrange project-specific profile geometry through the Sosoares technical department.
09 — Brochures
Brochures
On request Brochures for the ST | ST-Steel system are available on request from KR Installations.
KR supplies the current Sosoares product catalogue and the system-specific literature that matches your project scope.
Specifying the ST | ST-Steel system?
KR is Sosoares' Australian partner and fabricates, installs and distributes the OS minimalist range Australia wide. Talk to our team about configurations, thresholds, glazing build-ups and site conditions.
Enquire with KR Back to Sosoares Back to Windows & Doors
Sosoares is a registered trade mark of Grupo Sosoares. For project-specific dimensions, performance data outside the standard range, or BIM/CAD files, the Sosoares technical department can be reached at comercial@sosoares.pt — Rua do Campo Alegre, 474, 4150-170 Porto, Portugal. Values are indicative and depend on configuration, glazing and installation.