Expanded polyethylene - Wikipedia

Foam Ninja Polyethylene Foam Sheet 12 x 12 x 1 Inch Thick - 2 Pack Black Charcoal - Custom Foam Inserts High Density Closed Cell PE Case Packaging

PE foam, thickness 10 mm, width 1200 mm - winding 50 m

XPE Foam Roll, XLPE Foam Roll

Which one of these better foaming ( Polyurethane vs. Polyethylene)

Also did the PE foam mod and it does sound better : r/MechanicalKeyboards

EVA vs Polyethylene & Polyurethane Foam Mat Materials

Pe Foam Keyboard, Keyboard Foam Sound, Soft Foam Keyboard

1/16″ PE Foam Protective Packaging - 24″ X 625′, $85.99 Only

Keychron K2 PE Foam – Keyboard Kustoms

Cando Blue Pe Foam Rollers For Fitness, Exercise Muscle Restoration, Massage Therapy, Sport Recovery And Physical Therapy For Homes, Clinics, And Gyms : Target