What’s the Difference Between Acrylic Sheets, Plexiglass, Polyurethane Sheet, and PEEK Plastic?

2025-10-08 10:20:51

　　Navigating the world of plastic sheets can be daunting, especially when faced with names like Acrylic, plexiglass, polyurethane, and PEEK. While they might all look like clear or semi-finished plastics to the untrained eye, they are fundamentally different materials designed for specific jobs. Choosing the wrong one can lead to premature failure, safety issues, and unexpected costs. Let's demystify these common but distinct materials.

　　First, it's crucial to clear up a frequent point of confusion: Acrylic vs. Plexiglass. Is there a difference? The answer is no. Plexiglass is simply a brand name for Acrylic sheet, much like Kleenex is for facial tissues. The generic chemical name for this material is Polymethyl Methacrylate (PMMA). So, when you hear "Plexiglass," think of acrylic.

　　Acrylic is the go-to material when you need exceptional clarity and weather resistance at an affordable price. It transmits light more efficiently than glass (up to 92%) and is about ten times more impact-resistant, all while being half the weight. Unlike some plastics, acrylic boasts excellent UV resistance, meaning it won't yellow or become brittle after prolonged sun exposure. It's also relatively easy to cut, drill, and shape with basic tools. You'll find acrylic used everywhere from retail signage and protective barriers to skylights and aquarium panels. In short, think of acrylic as a superior, shatter-resistant replacement for glass where optical clarity and outdoor durability are paramount.

　　If your primary concern is durability against impact, abrasion, and constant wear, polyurethane (often referred to as PU) is the material to consider. While it can come in various formulations, polyurethane sheets are renowned for their incredible toughness. They are highly resistant to chipping, cracking, and gouging, and their abrasion resistance far surpasses that of acrylic. This makes them ideal for harsh environments. You'll often find polyurethane sheets used as industrial machine guards, lining for chutes and hoppers, conveyor belts, and heavy-duty jigs and fixtures. Choose polyurethane when your application involves scraping, impact, or high friction.

　　At the top of the performance and cost spectrum sits PEEK (Polyether Ether Ketone). This is not a general-purpose plastic but a high-performance engineering polymer designed for the most demanding applications. PEEK's standout property is its ability to perform continuously at extremely high temperatures, up to 480°F (250°C), while maintaining its mechanical strength. It is inherently flame retardant, resistant to a wide range of harsh chemicals, and is even biocompatible for medical implants. This exceptional performance comes at a premium price. PEEK is commonly specified in aerospace components, medical devices, semiconductor manufacturing, and high-stress automotive parts. Reserve PEEK for situations where failure is not an option and the environment is exceptionally severe.

　　So, how do you decide which material is right for you? Start by asking a few key questions.

　　If your project demands brilliant clarity and must withstand the elements without yellowing, acrylic is your most cost-effective and logical choice.

　　If your main challenge is physical abuse—constant impact, scraping, or friction—then the superior toughness of a polyurethane sheet will provide a much longer service life.

　　However, if your application involves extreme heat, aggressive chemicals, or requires the absolute highest level of mechanical integrity, no other plastic on this list compares to PEEK. Its premium price is justified in critical, high-stakes environments where other materials would quickly fail.

　　Understanding these core differences empowers you to look beyond the generic term "plastic sheet" and select the material that guarantees the success, safety, and longevity of your project.