The Best by Design - High Performance is our Minimum Standard Accurate Dorwin is the originator of the fiberglass window, the leading edge technology in today's window industry that was born and bred from the harsh conditions of the Canadian prairies. Quite simply, Accurate Dorwin window products will deliver the longest most trouble free usage of any window currently on the market regardless of how tough the environment or demanding the customer. Accurate Dorwin products are manufactured using the brilliant simplicity of pultruded fiberglass, a material created by saturating micro strands of glass fiber with resins to make it so tough and durable that this innovative product is found in modern aircraft design and even bridges. Virtually impervious to moisture, these windows won't bend, warp, discolour, corrode, rust, fade or deteriorate no matter what Mother Nature throws their way. In fact Accurate Dorwin fiberglass windows are eight times stronger than PVC. And, because the entire window is made from the same material - glass - there is a consistent and unified expansion and contraction with weather. This means that unlike other materials such as wood, aluminum or PVC there is a very low risk of seal failure, glass breakage, or frame stress.