What is the Difference Between Acrylic and Glass

Acrylic (PMMA, often called plexiglass) is a lightweight, shatter‑resistant plastic with excellent optical clarity and easier fabrication; glass is an inorganic, harder, more scratch‑resistant material that resists heat better and often looks more “premium.” 

Key differences
Material and makeup — Acrylic is a thermoplastic (polymethyl methacrylate, PMMA); glass is an inorganic silicate material (mainly silicon dioxide). 

Weight — Acrylic is roughly half the weight of comparable glass, making it easier to handle and cheaper to ship. 

Impact and shatter behavior — Acrylic is far more impact resistant and much less likely to shatter; when it does fail it cracks or forms blunt pieces rather than sharp shards. Glass is brittle and can break into dangerous sharp fragments unless specially treated (tempered/laminated). 

Optical clarity and UV — Both can be very clear, but acrylic commonly transmits slightly more visible light and many acrylic grades include strong UV blocking options; standard glass blocks less UV unless specially treated. 

Scratch resistance and hardness — Glass is harder and more scratch resistant; acrylic is softer and more prone to scratches (though hard coatings are available). 

Thermal behavior — Glass has higher thermal conductivity and lower thermal expansion; acrylic insulates better (feels warmer) but expands and contracts more with temperature changes. 

Workability and fabrication — Acrylic can be cut, thermoformed, drilled, and shaped more easily; glass needs cutting and heat/tempering processes and is harder to form on-site.

Safety and applications — Acrylic is preferred where safety, low weight, or impact resistance matter (signage, display cases, protective shields). Glass is preferred where scratch resistance, heat resistance, or a premium aesthetic is required (windows, cookware, some displays, and architectural glazing). 

Cost — Costs vary by grade and application, acrylic can be more expensive per sheet but may reduce installation/shipping costs and be more economical where safety/weight save on structure or labor.

Practical guidance (when to choose which)
Choose acrylic for lightweight panels, protective screens, museum display cases (when clarity + safety matter), DIY projects, or where forming and on-site fabrication are needed. 

Choose glass for surfaces requiring high scratch resistance, superior heat resistance, a premium look, or where long‑term surface durability is critical (tabletops, building windows, cookware, some picture glazing). Consider tempered or laminated glass for safety. 

One quick example
For a large framed artwork behind glazing where shipping weight and safety matter, museum‑grade acrylic minimizes breakage and can include anti‑UV coatings; for a high‑use tabletop that will be scratched, glass is usually the better choice. 

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