Glass vs Acrylic (Plexiglass): Which Should You Choose?

Best for lightweight, shatter-proof applications where impact resistance matters more than surface durability or heat tolerance. Ideal for protective barriers, signage, greenhouse panels, and temporary installations.

Glass: Transmits 92% of visible light with absolutely no distortion. Glass maintains this optical performance indefinitely -- a pane installed 50 years ago has the same clarity as the day it was made. There is no hazing, yellowing, or clouding regardless of environmental conditions. This permanence is why glass remains the standard for windows, mirrors, and precision optical applications.

Acrylic: Also transmits approximately 92% of visible light when new, and some manufacturers claim slightly higher transmission. However, acrylic is a softer plastic that can develop micro-scratches from cleaning, which create a gradual haze. Over years of outdoor exposure, UV degradation causes yellowing that reduces clarity. The flexibility of acrylic can also introduce slight optical distortion in larger panels.

Glass: With a Mohs hardness of 5.5-6.5, glass is significantly harder than most materials it encounters in daily use. Regular cleaning, contact with metal hardware, and everyday wear do not mark the surface. Only materials harder than glass (like diamond, quartz dust, or certain ceramics) can scratch it. This is the single largest practical advantage glass holds over acrylic in most installations.

Acrylic: With a Mohs hardness of approximately 3, acrylic scratches from virtually any abrasive contact including paper towels, dust particles dragged across the surface during cleaning, metal rings and jewelry, and even fingernails under pressure. Anti-scratch coatings are available but add cost and eventually wear through. This is acrylic's most significant weakness for any application that requires regular cleaning.

Glass: Standard glass weighs approximately 2.5 kg per square meter per millimeter of thickness. A typical 6mm tempered glass shower panel (say 2m x 0.8m) weighs about 24 kg (53 lbs). This weight requires sturdy mounting hardware and professional installation, but it also provides a feeling of solidity and quality that homeowners and architects value.

Acrylic: At roughly 1.2 kg per square meter per millimeter, acrylic is about half the weight of glass. The same 6mm panel in acrylic would weigh approximately 11.5 kg (25 lbs). This weight advantage is significant for large installations, overhead applications where structural support is limited, portable displays, and shipping. It also makes acrylic easier to handle for DIY projects.

Glass: Standard float glass is affordable and widely available. Tempered glass adds a processing surcharge. Low-E, tinted, and laminated options increase cost further. However, glass never needs replacement due to degradation -- the installed cost is typically the total lifetime cost. For building-code-required applications, there is no acrylic alternative, so cost comparison is moot.

Acrylic: Basic acrylic sheet stock is comparable to float glass in material cost. For large sheets and thick panels, acrylic can actually cost more than equivalent glass. The real cost factor is longevity: acrylic panels in outdoor or UV-exposed applications may need replacement every 10-15 years due to yellowing and hazing, adding to the total cost of ownership over the life of the installation.

Glass: Glass is completely inert to ultraviolet radiation. It does not yellow, haze, crack, or degrade from UV exposure regardless of intensity or duration. Glass with Low-E coating blocks up to 95% of all UV radiation, protecting interior furnishings from fading. Standard clear glass blocks most UV-B but transmits UV-A; Low-E or laminated glass blocks both. For the sun-drenched south-facing windows common in DMV homes, glass is the only permanent solution.

Acrylic: UV radiation breaks down the polymer chains in acrylic over time, causing yellowing, hazing, and eventual embrittlement. UV-stabilized acrylic resists this for 10-15 years in outdoor applications, but degradation is inevitable. Standard acrylic blocks most UV-B radiation naturally but transmits significant UV-A. Specialty UV-filtering acrylic is available but cannot match the permanence of glass.

Glass: Standard glass withstands continuous temperatures up to 250 degrees Celsius without any effect. Tempered glass can handle sudden thermal differentials exceeding 200 degrees Celsius -- which is why it is used in oven doors, fireplace screens, and applications near heat sources. Glass does not soften, warp, or deform under heat. For DMV homes, this means glass near outdoor grills, fireplaces, radiant heaters, and sunlit south-facing walls performs reliably for decades.

Acrylic: Acrylic begins to soften at approximately 100 degrees Celsius and can deform or warp at even lower sustained temperatures. It should never be used near fireplaces, ovens, cooktops, outdoor grills, or any significant heat source. Even extended direct sunlight on dark-colored frames can cause acrylic to bow. The thermal expansion rate is 8 times that of glass, meaning acrylic panels expand and contract noticeably with temperature changes -- a major concern for sealed installations.