8.1.4 Weatherability conformance testing requirements are
to reflect performance of a “typical” extrusion system profile
representing a specific PVC compound and a specific extrusion
technology. In no case is there an implied requirement for
testing all the various shaped profiles. The lengthy outdoor
weatherability testing shall be performed concurrently with
market development of new applications and sales of profiles
to existing markets. Completion of weatherability testing prior
to marketing of the product is not required. The profile
extrusion producer shall immediately respond in terms of
compound change or extrusion technology change to unsatisfactory
weatherability behavior of the profiles under test in any
climatic test site at any stage of the weatherability testing.