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The fire retardant behaviour of huntite and hydromagnesite – A review

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  • Qd Chemistry


- L.A. Hollingbery, T.R. Hull / Polymer Degradation and Stability 95 (2010) 2213-2225 1 The Fire Retardant Behaviour of Huntite and Hydromagnesite – A Review L.A.Hollingbery a,b* , T.R.Hull b a Minelco Ltd, Raynesway, Derby, DE21 7BE. [email protected] Tel: 01332 673131 Fax: 01332 677590 b School of Forensic and Investigative Sciences, University of Central Lancashire, Preston, PR1 2HE Keywords: hydromagnesite, huntite, UltraCarb, fire, flame, retardant, filler, mineral Abstract Naturally occurring mixtures of hydromagnesite and huntite have found important industrial use. Their endothermic decomposition over a temperature range similar to that of commonly used polymers and their release of water and carbon dioxide, has led to such mixtures being successfully used as fire retardants. They have replaced aluminium hydroxide and magnesium hydroxide in many applications. The current understanding of the thermal decomposition mechanism of both minerals and their combination in natural mixtures has been reviewed and related to their fire retardant action. Both minerals contribute to the reduction in flammability of polymers although the extent of these interactions has not been fully investigated. However, the fire retardant mechanism of these minerals appears more complicated than either aluminium hydroxide or magnesium hydroxide. This paper critically examines the literature on the fire retardant behaviour of mixtures of hydromagnesite and huntite, providing information of particular use to formulators of fire retardant polymers using these minerals. It also highlights the gaps in understanding of the fire retardant mechanisms of mixtures of hydromagnesite and huntite and areas that require further research. 1. Metal Hydroxides and Other Mineral Fire Retardant Additives The largest group of mineral fire retardants are metal hydroxides. Aluminium hydroxide (ATH) and magnesium hydroxide are the most widely used[

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