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OKALUX^® - Light Diffusing Glass

OKALUX® Technical Data References

Heat and sound insulation The capillaries prevent heat transmission in the cavity, not only with respect to convection, but also in terms of heat radiation. The particular geometry of “OKAPANE” capillary material means that an improvement in thermal insulation through greater layer thicknesses does not lead to any appreciable reduction in light transmission. In the triple glazing version (product version “OKALUX-K”), U-values of up to 0.8 W/m²/K (0.14 Btu/hr/rd2/°F) can be achieved. Further synergies become apparent in the field of sound insulation. Capillary slabs uncouple the panes of the insulating glass and absorb the sound. The following information applies for build-ups with a 6-mm outer pane and a laminated glass inner pane of 8 mm.

U-values refer to European Standard EN 673. Please contact our sales department for values according to ASHRAE conditions. Insulating glass with air or gas filling shows a significant increase in the U-value when installed at an angle due to the increase in free convection in the cavity. On the other hand, the capillary slab in the products OKALUX and OKALUX-K creates a static layer of air in any position. The examples on the right illustrate this.

The above data are approximate data. They are based on measurements of recognized test institutes and calculations derived from these measurements. At the moment, not all suppliers have adapted their key data to the currently applicable regulations. When making comparisons, please pay attention to the relevant manufacturer’s notes. On the basis of the old standards, total solar energy transmittances as well as shading coefficient values are each 1-3% lower, the former U-value according to DIBt/DIN is 0.1 W/m²K lower.

This information applies for structures with a 6-mm outer pane and a laminated inner pane of 8 mm. Lower total solar energy transmittance values can be implemented on request by custom-made structures. TSET (total solar energy transmittance or solar heat gain coefficient) and transmission values refer to European Standard EN 410. Values according to ISO 9050 may differ by 1-2%. UV protection 100% UV protection possible on request Build-up

The special feature of OKALUX Light Diffusing Insulating Glass is the capillary slab integrated in the cavity; the glass thicknesses depend on static requirements.

Dimensions and installation smaller glass dimension < 130 cm: no restrictions 130 cm < smaller dimension < 200 cm: light transmission not more than 32% smaller glass dimension > 200 cm: subdivision by joint with aluminum profile OKALUX Light Diffusing Insulating Glass is installed like normal insulating glass. To cover the capillary structure, glass fiber tissue is fitted in the cavity on both sides. In order to allow for tolerance, the glass fiber tissue must be cut so that the size is reduced by approx. 1.5 mm. To avoid direct light penetrating through the edge of the capillary slab and the adjoining spacer bar of the insulating glass, the unit edge cover must be at least 15 mm. With widths and heights exceeding 2 m, the cover has to be increased to 20 mm due to the need for a reinforced perimeter seal. For frameless glazing systems, it is recommended that the peri-meter should be shaded by a dark ceramic frit. Planning instructions Builder, owners and architects often want to technically assess the effect of glazing in daylight terms. Okalux offers such calculations as a voluntary additional service. The daylight-relevant properties of the room that need to be known are: room geometry, window dimensions approximate degree of reflection of the surfaces forming the room boundaries The so-called daylight quotient (D) in accordance with DIN 5034, Part 3, is relevant for the evaluation of the ambient daylight. This gives the ratio between the horizontal luminous intensity indoors and outdoors, under a completely overcast sky. This value can be calculated for different glazing variants using the existing simulation tools. The customer can thus assess the light-directing effects of special products, in comparison with normal glazing as well. In addition to the assessment in accordance with DIN, virtual images can visualize the light distribution in the rooms.

OKALUX® Guide Specifications