Ash

Ash is graceful species. It’s valuable for its strength qualities, very soft and suitable for the mid-latitude of Russia. Ash windows show high technical rated. The ash is ideal for wood windows, as it has to withstand the big stresses. But it also has a disadvantage: in spite of its beauty it is sensitive to temperature and humidity extremes. But there is not a problem as it may be heat-treated. After that the ash becomes not only strong but obtains special color and texture.