This is an update of a paper written for the 1996 CAD RETEC. The original paper considered the effects three different Infrared reflecting black pigments have on weatherable R-PVC. They were evaluated both as individual pigments and when formulated in typical vinyl siding shades. The effects measured included: % infrared reflection, heat build-up properties, and weathering characteristics - 1 year South Florida. The paper will primarily focus on the three year South Florida weathering results and look further at the possible effect free Iron is having on the weathering performance. Additionally, a new weathering study has been initiated to look at variations in both the pigments and the R-PVC compounds to more fully understand the interaction of all factors.
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