Abstract
This paper describes investigations which have been carried out to characterize the behaviour of polyester moulding compounds when subjected to tests in environments encountered in automobile underbonnet situations. The tests contrast the behaviour of various polyester resin types in aqueous and hydrocarbon media; and show that the materials which best resist water and antifreeze exhibit the greatest degradation in petrol. The resistance of a range of polyester types to dry heat at 130°C and 180°C is discussed. Combinations of resin and glass fibre types have been tested in boiling water: the results show that the correct choice of resin and glass fibre can improve the onset of blistering from within one week to over 12 months. Single surface exposure of moulded plaques is shown to result in a far higher level of strength retention than total immersion of the material. A comparison has been made of the effect of different types of motor fuel, including methanol additives and ethanol, on the strength retention of dough moulding compound and sheet moulding compound throughout a 12 month ageing period.
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