Acrylic vs Glass: Why Plastic Might Be the Better Choice

Glass has been the default transparent material for centuries, but acrylic sheet has quietly replaced it in a wide range of applications over the past few decades — and for good reason. For displays, barriers, skylights, and signage, acrylic often delivers better practical performance at a lower installed cost.

Here's how the two materials compare across the properties that matter most.

Weight

Acrylic is approximately half the weight of glass. Acrylic sheet has a density of around 1.19 g/cm³, while glass sits at 2.5 g/cm³. For large-format applications — floor-to-ceiling display cases, overhead glazing, large sneeze guards — this weight difference is significant for structural loads, handling, and installation costs.

Impact Resistance

Acrylic is approximately 17 times more impact-resistant than glass. Standard glass is brittle and shatters into dangerous shards under impact. Acrylic, if it does fracture, breaks into large blunt-edged pieces rather than razor-sharp fragments. For applications where safety is a consideration — sneeze guards, school displays, child-accessible barriers — acrylic is meaningfully safer.

Optical Clarity

Here the comparison is closer than most people expect. Acrylic actually transmits more light than glass — approximately 92% of visible light versus glass at around 90%. High-quality cast acrylic sheet is optically brilliant and virtually indistinguishable from glass to the naked eye. Over time, acrylic maintains its clarity better than untreated glass in outdoor environments.

UV Filtering

Standard glass passes most UV radiation. Acrylic naturally blocks UV-B and most UV-A radiation. This makes it a better choice for display cases housing artwork, photographs, or merchandise that could fade under UV exposure — museums, retail display cases, and gallery environments.

Ease of Fabrication

Acrylic is far easier to fabricate than glass. It can be CNC routed, laser cut, heat-bent, and polished to a crystal-clear edge finish — all operations that are impossible or impractical with standard glass. Custom shapes, curves, cutouts, and engraving are straightforward with acrylic. At P&M Plastics, we cut acrylic to size from our Burleigh Heads workshop with fast turnaround.

Scratch Resistance

This is glass's clear advantage. Glass is significantly more scratch-resistant than acrylic. Diamond-hard glass resists everyday abrasion from cleaning, keys, and debris far better. Acrylic scratches relatively easily, though scratches can be polished out using acrylic polish — something that's not possible with glass.

For high-traffic horizontal surfaces like tables or countertops, glass remains the better choice. For vertical applications like display cases and barriers where scratching is less of a concern, acrylic performs well.

Thermal Insulation

Acrylic has better thermal insulating properties than glass. This makes it a more energy-efficient choice for skylights, roofing panels, and glazed enclosures where minimising heat transfer is important.

Cost

For standard flat panes, glass and acrylic can be comparable in material cost — but acrylic is typically cheaper for large-format or custom-cut work once fabrication and installation labour is factored in. Acrylic's lighter weight also reduces structural and framing costs.

Which Should You Choose?

Choose Acrylic when you need:

Light weight and easy handling • Safety in impact-prone areas • UV filtering for displayed artwork or merchandise • Custom shapes, cutouts, or curved forms • Sneeze guards, display cases, signage, skylights, aquariums

Choose Glass when you need:

Maximum scratch resistance • Horizontal surfaces under heavy contact • Fire-rated glazing • Extreme heat resistance

Talk to P&M Plastics

We cut acrylic to size from our Burleigh Heads workshop and can fabricate custom display cases, sneeze guards, pool fencing panels, and signage. Browse our acrylic and Perspex range at /materials/acrylic-perspex and /materials/acrylic-perspex-cut-to-size, or use our comparison tool at /materials/compare. Call 07 5535 7544 for a quick quote.