Annealing extruded acrylic

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25 August 2026 at 09:49 #862086
Mick Bailey
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@mickbailey28509
As a side project I’ve machined up some guitar pickup mounting rings in 4mm extruded acrylic sheet (PMM). Size is 4″ x 2 1/8″ and with the cutout there’s about 3/8″ border. Drilled and countersunk on the corners.

Is there any mechanical advantage in annealing them? Cast rather than extruded would have been a better choice, but I’ve used what’s to hand.

If annealing is necessary I’ll use my toaster oven with a Variac and give them a few hours at 85 degrees C.
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Annealing extruded acrylic

Annealing extruded acrylic

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