Panel is used in many applications of doors and windows as per the requirement. Door and window mainly have two panels such as glass and non glass which include aluminum, plastic (uPVC or PVCu or PVC), timber and composite material.
Panels are made of uniform density to resist any invasion and they are fixed in the outer frame which is either of the material or other.
Glass panel is mostly used in the top portion of door to allow sunlight in the room and the lower portion is of opaque material panel which renders strength.
As per the installation the proportion of panels is been selected if it is for back door then more of a glazed panel is used & if for a front door then more of opaque is used.
Opaque such as aluminum, PVC, hardwood and composite have their own benefit regarding the material used.
Double glazed panels are efficient and so the opaque should also be thermally efficient. Aluminium is made thermally efficient by inserting a polyamide strip to break the thermal conductivity this is done while manufacturing them.
PVC & hardwood is non conductor of heat by structure so hardwood, PVC, PVCu, uPVC window panel insulates the room well. And for composite or GRP (glass reinforced plastic) it comprises of two non conductor material so that also insulates well.
Tough panels render strength to the door structure and provide a provision for cat flap which can be opened both sides. So the doors can be made look rich with various types of panel.