Profile: Graham Holmes Astraseal Ltd. manufactures windows and doors. We offer profile systems comprising 60 mm and 70 mm casements, tilt & turn, pivot, fully reversible & vertical sliding windows, conservatories and curtain walling. Our aluminum windows are designed to reduce heat loss by the use of a thermally broken aluminum frame with a polyamide bridge. The polyamide material has a very high resistance to heat transfer from the inner face of the frame to the external face of the frame.