Onduline is manufactured by a patented process which ensures even penetration of bitumen.This ensures that the sheet has a high dimensional stability and prevents elamination. The colouring of the sheet is achieved through a unique pigmentation process which ensures that the colour is stained into the sheet. Unlike painted sheets, Onduline sheets retain their colour over a long period without fading and surface peeling.The result is a flexible and cost effective product that provides weather protection,sound and thermal insulation - even in the most extreme climatic conditions. It is waterproof and cannot rust or become brittle. It resists most chemicals and corrosion, and is very easy to handle and fix.