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Extra resources for Durability of Building and Construction Sealants and Adhesives: 2nd Volume

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However, the practical value of accelerated weathering data is often limited to relative comparisons because such data applies only to specific formulas and test conditions; therefore, it seems to be difficult to arrive at reliable correlations between accelerated weathering data and outdoor weathering results [1-3]. Formulators will therefore often have to find their own methods to gauge outdoor performance. In this paper we will consider some of the influences that determine durability and weatherability, such as binders, pigments, plasticizers, catalysts, and additives.

Under the trade name Kaneka MS PolymerTM. For the modified silicone polymer (polypropylene oxide backbone) Kaneka MS PolymerTM-S203 and for the acrylic modified silicone polymer (partly acrylic backbone) Kaneka MS PolymerTM-S903 was used. : 63~ 550 W/m2; cycle: 18 min water spray at 43~ and 50 % rel. humidity (rh), followed by 102 min at 43~ and 50 % rh, tested according to JIS A 1415:1999 "Methods of Exposure to Laboratory Light Sources for Polymeric Material of Buildings". : 65~ tested according to ISO 4892-2:2006 "Plastics-Methods of Exposure to Laboratory Light Sources, Part 2: Xenon-arc lamps".

In this study, different g r a d e s o f t i t a n i u m dioxide, w h i c h differ w i t h r e s p e c t to the surface t r e a t m e n t a p p l i e d b y the m a n u f a c t u r e r ( i n o r g a n i c m e t a l o x i d e and/or organic), w e r e c o m p a r e d . A s b a s e sealants, a o n e - c o m p o n e n t p o l y u r e t h a n e (PU-1) and a o n e - c o m p o n e n t m o d i f i e d s i l i c o n e ( M S - I ) sealant f o r m u l a w e r e selected. In the PU-1 m o d e l f o r m u l a (Table 2), three different g r a d e s o f t i t a n i u m d i o x i d e , w h i c h h a v e a surface t r e a t m e n t o f a l u m i n a (type A), a l u m i n a and silica (type B), and a l u m i n a , silica, a n d an o r g a n i c c o a t i n g (type C) w e r e used.

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