Specifications & Benefits

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.

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

All Slim glaze double glazed units carry a 5 year warranty and a copy can be supplied on request


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.

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

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.

Slim Glaze DGU Specifications

Overall Thickness Glass Thickness Internal 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