Propak’s innovative thermally broken steel system has been well received by many major architects and is now used extensively in high end residential and refurbishment projects throughout UK.

We have worked on behalf of some of the largest developers and property owners such as The Crown Estate and are now the largest UK based fabricator of the slimline system.  We have a wealth of experience in design, manufacture and installation so can support you from initial design right through to completion.

The very narrow profiles provide an economic and aesthetically appealing solution for a wide range of window constructions with impressive face widths of just 25 or 40 mm. The steel and glass fibre construction guarantees minimal heat loss and maximum stability.

The profiles can give a sleek minimal frame for a modern building and for refurbishments to maintain an authentic, historical look to outside of the building whilst meeting the highest standards in terms of thermal and acoustic sound reduction; with practically no restrictions.

The conventional opening types for buildings from the 1950’s and 1960’s, such as inward or outward-opening side-hung, double vent, bottom-hung, top-hung or projected top hung windows, can be constructed from standard profiles.

Technical Specification

The systems that we manufacture can be designed to accommodate a wide range of specifications as shown in the tables below.

A large range of curved units and surface finish options are available to with all conventional opening types such as inward or outward-opening side-hung, double vent, bottom-hung, top-hung, projected top hung, pivot, or tilt and turn windows, can be constructed using standard profiles within the system.

Acoustic

Up to 47dB
Heritage System: 34mm Glazing depth.
HI System: 90mm Glazing depth.
Double and triple glazed units provide a range of enhanced acoustic performances.

Thermal Properties

U-Values down to 0.8 W/m2K
Ultra HI System: U-Values down to 0.69 W/m2K for fixed panes

Maximum H

Heritage System: 1800mm
HI System: 2800mm
Primo System: 2800mm
TF System: 2300mm

Materials

Mild Steel
Bronze
Stainless Steel
Corten

Surface Finishes

PPC – Polyester Powder Coating – Standard & Non Standard RAL Colours
Specialist PPC finishes in Anodonic Colours (Bronze, Pewter, etc.)
Colour matching available
Stainless Steel – Brushed or Mirror Polished
Bronze – Brushed, Mirror & Patinated
Corten

Glazing Depths

Heritage System: 34mm
Ultra HI System: 90mm

Construction Types

Arched heads & bespoke geometrics
Inward or Outward Opening Side-hung Vents
Double Vents
Bottom-hung
Top-hung
Projected Top Hung
Pivot Windows
Tilt and turn

Access Equipment Ironmongery

Hinges: Welded or Screw-on. PPC, steel or stainless steel
Concealed Hinges: Tilt & Turn Option only.
Locking: Concealed multi-point locking, Cockspur
Handles: Espagnolette, Lockable Espagnolette, Cockspur (Satin, Copper, Brass, Dark Bronze, Gun Metal, Antique Black)
Safety: Friction Stays, Concealed Restrictors

Spread Technical Features

Arched heads and bespoke geometrics available
Connection to solid wall or lightweight wall construction
Connections to curtain wall and glazed partitions all fully certified
Installation depth 60mm
Dry and wet glazing

Tests Certificates

Heritage CE marking details:
Water tightness EN 12208 Class 9A – 600 Pa
Resistance to Wind load EN 12210 Class C4-1600 Pa
Air Permeability EN 12207 Class 4 – 600 Pa
Thermal Production EN ISO 10077-1 1.9 W/m2K
Metal Profiles with Thermal Barrier in accordance with EN 14024
Airborne sound insulation to Rw 50 db

HI System CE marking details:
Water tightness EN 12208 – Up to E750
Resistance to Wind load EN 12210 Class C5
Air Permeability EN 12207 Class 4
Thermal Production EN ISO 10077-1 0.92 W/m2K
Metal Profiles with Thermal Barrier in accordance with EN 14024 TW/CT2
Airborne sound insulation to Rw 46 dB

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