Specifications and Benefits

Slim Glazing is great for Thermal Efficiency

Thermal Efficiency

The thermal efficiency benefits of IMC Glass Slim Glaze double glazing can now be even better than standard double glazing, achieving U-values (the term used to measure thermal efficiency) of as low as 1.2 on a 6mm cavity and 1.1 on a 8-cavity, depending on the type of gas fill used in the cavity. The reduction of heat lost through the glass is up to 77% as when compared against single glazing and it is possible on some windows to use Slim- Glaze units to achieve the Part L- building regulations for thermal efficiency.

Inert Heavy Gas

The thermal conductivity properties of krypton and xenon are much lower than air, meaning they are much more efficient insulators and are excellent at reducing U-values in sealed double glazed units. All our slim glazing uses these two gases exclusively, meaning you get excellent insulation against both cold and noise.

Our Slim Glazing glass uses Inert Heavy Gas
Slim Glaze double glazed units are great for minimising condensation

Minimise Condensation

Continual condensation can seriously deteriorate the lower sections of a timber frames. Slim Glaze double glazed units will slow down the dew point being reached. The inner pane of the double glazed unit is warmer than the outside pane and our warm edge ‘super spacer’ bar acts as a thermal break, stopping the cold reaching the inner pane of the unit. This helps maintain the room temperature when the heating is switched off at night and thereby reduces condensation and heat loss.

Slim Glaze Spacers

• High performance • Blend with any frame finish • 4mm, 6mm or 8mm unit cavity • Just 3mm in depth • Ruler straight edges • Sharp 90° corners

Specifications for Slim Glaze Spacers


When the sun shines through a window the room heats up and this is referred to as Solar Factor or Gain, which will provide a measure of free winter heating. This extra Solar benefit also increases the Window Energy Ratings.
Slim Glaze Super Clear incorporates the leading glass in this market, Pilkington Optiwhite. It has a high Light Transmission of 85% and therefore a high Solar Factor of 79% which means cheaper heating bills in the winter.
Specifcations and Benefits to using slim glaze super clear windows.
The reason why Pilkington Optiwhite is such an excellent choice for Slim Glaze Super Clear is the sheer variety of solar factor benefits it can offer. It is practically colourless, and the green cast inherent to other glasses is not present.It is therefore ideal for use where glass edges are visible or where a neutral colour is desired. As its light transmission is higher than clear float glass, it is perfect for applications where high transparency is important.
Low-iron glass like Pilkington Optiwhite is made using carefully selected raw materials with a naturally low iron content. The melting process is tightly controlled to ensure that the product properties remain consistent, using along with a Low-E coated glass, Warm Edge and Krypton Gas can greatly enhance the Window Energy Rating.


No matter where it originates, from railways, aircraft or factories, noise is all around. Future trend research suggests that traffic and noise in general will only get worse. The careful and considered selection of glass can be crucial in helping to reduce noise level and meet noise requirements. Pilkington Optiphon™ is a high quality acoustic laminated glass that offers excellent noise reduction without compromising on light transmittance or impact performance. The desired acoustic performance can be achieved through combining various thicknesses of glass with a special PVB (polyvinylbutyral) interlayer. With a large variety of product combinations, Pilkington Optiphon™ offers the opportunity to achieve specific noise reduction requirements.

Product features and benefits:

• Provides a range of noise control levels • A thin and lightweight solution to noise problems • Achieves safety class 1(B)1 (EN 12600) and is available to meet security glass classifications in accordance with EN 356 • In case of breakage remains intact, minimising the risk of injury

Slim glazing is great for sound reduction.
Certification & Installation

IMC Glass Certification

IMC Glass work closely with BSI and have independent testing on our products carried out twice a year as per BSEN1279 part 6 Annex B Audit test. Our quality management/production systems are also independently audited by the notified body (BSI) to ensure the on-going quality of our products.

These are the certificates we hold:

• Certificate BSEN1279 Part 2 BSI 262/4677672 (Production Quality) • Certificate BSEN1279 Part 3 BSI 371/7758378 (Gas Leakage) • Certificate BSEN1279 Part 6 SDG0703/11870B Annex B Audit Test, Declaration Of Performance Number 68603 • Certificate BSEN673 UKAS Certified U-Value (Insulation)

Certification CE and BSEN1279 Approved

To manufacture double glazed units, certification is required for BSEN1279 Part 2, production quality and BSEN1279 Part 3, which relates to gas leakage at less than 1% per annum. Certification is your guarantee of quality and reliability. It is a legal requirement that all double glazed units must have CE mark in accordance with construction products Regulation declaration of performance.

Our Slim Glaze is standards compliant.

Safety Glass Standards

Safety glass required for all door and sidelights and any glass in a window below 800mm from the floor and can be toughened or laminated glass. Laminate glass has less breaking resistance than toughened glass. Laminated glass will provide protection to internal furnishings as Ultra Violet radiation is reduced by 98/99% and a slightly better acoustic rating. All Double Glazed Units can be constructed with any type of glass or thickness. The width of the cavities determine the insulation or U Value, the thickness of glass has no effect on U Values. All simulations of U-values can be available on request.

Our Safety Glass Standards

• Toughened glass, Class 1 BSEN 12150 • Laminated glass, Class 2 BSEN 14449

Map showcases locations where slim glazing is to be used.

Glazing Installation Recommendations

Glazing Materials

• Hodgson Silfix U9 Low moisture Neutral-cure silicon which cures to
form a flexible rubber.
• Hodgson flexistrip a security glazing strip for double-glazing units and laminated glass.
• Hodgson colour glaze putty
• Hodgson multi- purpose putty
• Hodgson butyl 66 Dry seal mp manufactured by repaircare a non-linseed based product manufactured by repair-care which is a durable alternative to putty.

Face-Pointed Frames

Slim Glaze units to be bedded in back rebate with approximately 2mm of butyl (non-hardening compound) or with flexistrip and centred in rebate with spacers or packers, (the latter not required if using flexistrip) to keep the unit raised from the rebate platform completely fill the void area with silfix silicone and allow to completely cure.
The units can then be putty fronted using one of the above product’s making sure there is full adhesion to the frame and glass and no areas for water to enter the glazing system.

Beaded Frames

Treat in the same way as above up to the point of putty-fronting. Timber beads to be secured against glass
using nails or screws and sealed with Silfix U9 low moisture Silicone to completely seal any residual voids between glass and rebate and glass and bead. Finish with paint application making contact with glass both inside and outside. It is very important that regular maintenance of the frames and glazing system is undertaken to prevent the access of water into the glazing system.

Moisture Attack

The major enemy of insulated glass units is water. If water is trapped in contact with the seal of the unit for a period of time, the unit will fail. All glazing systems must protect the edge of the insulated glass unit, either by preventing access of water or by proper drainage and ventilation.


Some silicones are not suitable for use with sealed units. A silicone component (plasticizer) can migrate to the primary seal causing catastrophic failure of the unit, if in doubt please contact your supplier before installing.

Glazing Maintenance Recommendations

To obtain maximum life expectancy for sealed units, it is essential that water is prevented from leaking round the glazing putty / gasket into the frame and lodging there. Glazing and maintenance recommendations must therefore be carried out in accordance with the unit maker’s instructions. The schedules of maintenance detailed below refer to commonly used and accepted glazing systems are approved by the Glass and Glazing Federation for houses and low rise buildings. Where other systems have been used the unit maker should be consulted for advice on maintenance. Glazing should be inspected at least annually and treated as necessary.

Standard units fitted into wooden frames with beads, using non-setting glazing compound and silicone sealant: Where they are surface cracks, loss of adhesion or voids, rake or remove the faulty compound or sealant and replace with

non-setting compound or silicone sealant, preferably the same as originally used. Always use non-setting glazing compound for back bedding repair purposes. When pointing non-setting glazing compound between the beads and glass ensure that, the compound slopes away from the glass. When using silicone sealant ensure that the sealant is proud of the glass, this will prevent water lodgement occurring.

Standard units fitted into frames with beads, using gaskets or mastic load bearing strips: this system is normally used for glazing into aluminium and uPVC window and door frames. Check annually for obvious deterioration and ensure that all drainage holes are free from obstruction.


Slim Glaze DGU Specifications

Glass Thickness  

Gas Space

Gas U Value
11mm 3mm 4mm Xenon 1.4
11mm 3mm 4mm Krypton 1.9
12mm 4mm 4mm Xenon 1.4
12mm 4mm 4mm Krypton 1.9
14mm 4mm 6mm Xenon 1.2
14mm 4mm 6mm Kyrpton 1.5
16mm 4mm 8mm Xenon 1.1
16mm 4mm 8mm Krypton 1.3
Indepth infograph showing slim glaze specifications