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After exiting the press, the hot extrusion is quenched to cool it. The rate of cooling affects the mechanical properties of the finished product, such as the hardness and resilience of the metal.

Quenching brings the temperature of the extrusion down to ambient levels at a controlled rate. It can be accomplished by forced air convection or soft industrial water. Water cools at a faster rate, producing a harder product, but cooling too rapidly can crack or distort the aluminium profile.

By monitoring the cooling rate of the extrusions moving through the quench, a finished product with the required properties is consistently achieved. Any structural damage to the profile from cooling it too quickly is avoided.

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