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Glass Options



Laminated IG







NOTE: Tested units include argon. The

laminate has 1/4" inner pane. Based on

Lawrence Berkeley Lab (LBL) Window

5.2 © 2003 analysis for classical UV

transmission data.

Kolbe offers numerous options to achieve the optimum energy efficiency for the geographic region in which you live.

To improve thermal efficiency, microscopically thin coatings are applied to the glass that is used in the insulated glass

units incorporated into our windows and doors. The state-of-the-art application of the LoE coating is known as sputter

coating. There are a number of coating options available, and the appropriate one should be chosen for either the specific

geographic region or building construction design required to help achieve the highest level of energy performance possible.

As standard, we use double strength annealed glass in most units, with double-pane insulating LoE


-270 glass. In energy

zones with a warmer climate, LoE coatings can be used to significantly block the amount of heat transfer, reducing the load

of air conditioning systems. In colder climate zones, LoE coatings can be used to allow for high solar heat gain, resulting

in reduced heating and cooling costs throughout the year. LoE coatings also reduce the potential for condensation, as

well as provide protection against fading of furniture, fabrics and carpeting. Numerous glass options and combinations are

available for different applications and various geographic regions. Special glass requests are also welcomed.


When the weather turns frigid, LoE-180 glass is the perfect cold

remedy. It keeps homes warmer and more comfortable by blocking

heat loss to the outside and letting the sun’s heat stream in to increase

solar heat gain.




Wherever glare is a problem, LoE²-240 glass is a solution to maintain

year-round comfort in warmer climates. In summer, it blocks oppressive

solar heat gain and maintains cool glass temperatures. When winter

rolls around, it keeps inside glass temperatures warm.




LoE²-270 glass delivers year-round comfort in most types of weather.

Offering a balance of high clarity and low solar heat gain, LoE


-270 is

standard in most Kolbe products. In summer, it rejects the sun’s heat

and damaging UV rays. In winter, it reflects heat back into the room.




For warm climates, LoE³-366 delivers a balance of solar control and

high visibility. This coating helps provide protection of fading, blocking

up to 95% of the sun’s damaging rays.




LoE is an additional interior coating applied to help meet the strictest energy requirements and provide

protection against heat loss and UV damage.

LoE Coatings

Argon gas is a colorless, odorless, non-toxic, naturally-occurring element that is inert, meaning it will not react with

other elements or gasses. Because argon gas has a thermal conductivity 30% lower than air, the use of argon gas in a

LoE coated insulated glass unit allows it to provide for an incremental improvement to the overall U-factor of the unit.

For increased energy efficiency, argon is supplied, at no additional cost, in all LoE coated insulated glass units, with the

exception of those units when glass dimensions are less than 14" x 14" or units that require capillary/breather tubes due to

being shipped over or installed in high altitude elevations. Units constructed without argon gas will have higher U-values.

High altitude situations occur when Kolbe double pane insulated glass units are shipped over or installed in areas that

begin at 5000 feet above sea level. For triple pane insulated glass units, high altitude begins at 3500 feet above sea level.

To find the energy performance for units in high altitude situations, use our energy database at and select

Air as the fill option for double or triple pane glass.

Argon Gas

186 Kolbe Ultra Series