Effect of PVC resins on multi‐screw pipe extrusion

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Abstract
This paper reviews three flexible PVC formulations using various types of alumina trihydrate (ATH) and magnesium hydroxide [Mg(OH)2]. Smoke values are compared. In two of the formulations, Mg(OH)2 has better smoke values than ATH; in a third formulation, ATH has better smoke values than Mg(OH)2. However, the third formulation uses an ATH with a very high surface area, which may indicate that smoke suppression may be a function of not only the type of flame retardants used but also surface area.

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