Cast Acrylic has far less stress in the material than extruded Acrylic due to the nature of manufacture, so should be used whenever possible as it is of far higher quality. Extruded Acrylic is also dimensionally less stable, can stretch or burn more easily, is softer and is far more prone to cracking even with heat treatment. You can source rods or tubes of Acrylic as a base material in a cast form, but these still go egg shaped with heat treatments, so Carville normally produce our own rods and tubes from sheets of cast Acrylic after in-house heat treatment by turning as we can then guarantee dimensional stability.
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