Plastic films and rolls are thin polymers that have a slippery surface and serve as electrical insulators. UHMW polyethylene films and rolls are durable and often used in material handling applications. Polyester films and rolls are strong, safe, nontoxic, and recyclable. They are easy to machine and are often used in food-processing applications. LDPE films and rolls are soft, flexible, and chemical-resistant. Polytetrafluoroethylene (PTFE) films and rolls are stable at high temperatures and are ideal for electrical insulation in circuit boards and for fabricating the electrostatic analogues of magnets.