Polyester resin is typically described as which of the following?

Polyester resin is typically described as which of the following?

• A. Flexible and water soluble
• B. Transparent and soft
• C. Biodegradable and conductive
• D. Rigid, heat/chemical resistant, used in GRP and boat hulls

Answer: (D)

Polyester resin in composites is a thermosetting resin that cures to a rigid, durable material. It’s described as having good heat and chemical resistance and is commonly used with glass fibre to make glass-reinforced plastic parts, such as boat hulls. This combination—rigidity, resistance to heat and chemicals, and use in GRP for hulls—fits how polyester resin is typically used and behaves in practice. It isn’t water soluble, not biodegradable, and it isn’t conductive, and cured polyester is not transparent or soft, which is why the other descriptions don’t fit.

Polyester resin in composites is a thermosetting resin that cures to a rigid, durable material. It’s described as having good heat and chemical resistance and is commonly used with glass fibre to make glass-reinforced plastic parts, such as boat hulls. This combination—rigidity, resistance to heat and chemicals, and use in GRP for hulls—fits how polyester resin is typically used and behaves in practice. It isn’t water soluble, not biodegradable, and it isn’t conductive, and cured polyester is not transparent or soft, which is why the other descriptions don’t fit.