The K value is a physical quantity that measures the thermal insulation performance of a material, that is, the heat transfer coefficient.The K value of architectural glass is defined as: under standard conditions, the heat transfer from one side of the unit area of the glass component to the other

uPVC + Aluminium windows combine the best properties of both materials. A profile of high quality aluminium is attached to a uPVC-frame. This is the perfect solution for all building projects aiming for noble visual appeal, stability of the aluminium profile and the superior thermal insulation of uPVC. With its outstanding static properties, it is ideal for large glazed areas. Aluminium and uPVC have been uniquely bound together, which is extremely economical: for manufacture, maintenance and energy efficiency.

Tilt and turn windows open inwards to allow flexible ventilation. With a tilt turn window you don't have to have the window open fully to let air into your home. Opening it slightly, tilting into the room, provides the air flow required but with the additional benefit of security.

Lumei Americano Linea uPVC profile adopts environmental protection formula selects non-toxic CaZn heat stabilizer, imported BASF titanium dioxide, ultraviolet absorber, antioxidant agent and other top-quality additives. Those help all properties of Lumei uPVC profiles accomplices with the Chinese National Energy Conservation and Environmental Protection Indicators as well as the EU market Standards. Lumei PVC profiles complied with the national standards GB / T8814-2004 and strictly follow ISO9001-2008 international quality management systems and passed the weather resistance test of 6000 hours. Lumei focuses on serving the international market whose profiles obtained CE & RoHS certification.