Insulated Glass (IGU) Manufacturer: Double & Triple

An insulated glass unit (IGU) is two or three panes sealed around a spacer with a dry or argon-filled cavity, built to control heat loss, solar gain and noise. As insulated glass manufacturers we make IGUs to your drawing and performance targets; this guide covers what to specify and how to order.

What we build into a custom IGU

Double or triple glazing — two panes with one cavity, or three panes with two cavities where a lower U-value is required.
Low-E and solar-control coatings — single-, double- or triple-silver Low-E selected by façade orientation to balance winter insulation (low Ug) against summer solar-heat control (g-value / SHGC) and daylight (VLT).
Warm-edge spacer and gas fill — warm-edge spacers and argon fill to improve the edge and centre-of-glass performance.
Safety and acoustic build-ups — either pane can be tempered or laminated where safety, overhead or acoustic conditions call for it.
Made-to-measure sizes and shapes — to your schedule, within the processing range we confirm for the make-up.

Units are produced to EN 1279, and we provide the corresponding performance data (Ug, g-value, VLT) with the quotation.

What to specify

Make-up — double or triple, and the glass on each pane (thickness, coating, tempered/laminated).
Performance targets — your required U-value, solar control and any acoustic target.
Sizes, shapes and quantity — a schedule or drawing.
Destination and shipping terms (EXW / FOB) and target date.

If you are not sure of the exact make-up, send the performance targets and the application and we will propose it.

How to order

See the insulated glass (IGU) product page for the specification, then send us your schedule and targets. We will confirm the make-up, minimum order quantity and lead time, and return an itemised quotation with performance data and EXW / FOB pricing.

Insulated glass unit specifications

Unit configuration. A double-glazed unit pairs two glass panes with a single sealed cavity — a typical make-up such as 4-16-4 mm gives the right balance of thermal performance and unit weight for most façade applications. A triple-glazed unit adds a third pane and a second cavity where a lower U-value is the priority.

Spacer cavity. Cavity width is typically 6–20 mm. Warm-edge spacers — in aluminium or stainless steel — reduce thermal bridging at the perimeter, improving the overall U-value and lowering the risk of edge condensation.

Gas fill and thermal performance. Argon is the standard fill. Combined with a suitable Low-E coating, argon pushes the centre-of-glass U-value to 1.1 W/m²K in a double-glazed unit, or lower in triple glazing.

Glass pane options. Either pane can be clear, low-iron, tinted, tempered, heat-strengthened or laminated, and can carry a Low-E or solar-control coating. Safety, acoustic and performance requirements can all be incorporated in the same sealed unit.

Standards. Manufactured to GB/T 11944, EN 1279 and ASTM E774. We provide Ug, g-value and VLT performance data with the quotation.

Sizes. Large-format, made-to-order, cut to your drawings; we confirm the achievable range for the make-up you specify.

Curved and safety IGUs

An IGU does not have to be flat or use monolithic glass plies.

A high-speed railway station façade required compound-curved Low-E tempered insulating units for the main concourse envelope — curved toughened glass with a Low-E coating on the inner face, sealed around an argon cavity to a second curved toughened pane. Producing a curved IGU of this type demands that bending, coating and sealing all land on the same curved geometry; in-house curved glass processing is what makes the combination practical. Full case: a high-speed railway station façade.

A research-institute façade combined structural SGP lamination with a curved IGU: the outer component was ultra-clear double-curved tempered glass laminated with a 2.28 mm SGP interlayer, then sealed into an insulating unit. The result delivered optical clarity, structural post-breakage performance and thermal efficiency in one curved package. Full case: a research-institute façade.

Both are available from one factory and can be quoted alongside flat IGUs on the same schedule.

Frequently asked questions

What is the difference between double and triple glazing? A double-glazed unit has two panes and one cavity; triple glazing has three panes and two cavities. Triple glazing achieves a lower U-value but adds weight and thickness. For most façade applications, double glazing with argon and Low-E is sufficient.

What U-value is achievable? With argon fill and a suitable Low-E coating, a double-glazed IGU can achieve a centre-of-glass U-value from 1.1 W/m²K. We provide calculated Ug, g-value and VLT with every quotation.

What spacer options are available? Warm-edge spacers in aluminium or stainless-steel construction, with cavity widths of 6–20 mm. Warm-edge spacers reduce edge-zone thermal bridging compared with standard aluminium spacers.

Can an IGU combine laminated and curved glass? Yes. Either pane can be laminated with PVB or SGP, and either or both panes can be curved. A curved laminated IGU — as demonstrated in the research-institute project above — is feasible when curved forming, laminating and sealing are all in-house. Send your drawings and we will confirm what is achievable.

Send us your schedule and targets and we will return an itemised quotation with performance data and EXW / FOB pricing.

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