Acrylic glass or polycarbonate? – Which plastic is better for transparent applications?

Transparent plastics are indispensable in modern applications. Whether as machine cladding, protective screen, roofing, advertising panel or design object – they offer an attractive and often lighter alternative to glass. Two materials dominate the market: acrylic glass (PMMA) and polycarbonate (PC). Both are characterised by transparency and versatile processing properties, but differ significantly in terms of load-bearing capacity, weather resistance and price. In this article you will receive well-founded decision-making support on which material is better suited to your purposes.

What is acrylic glass (PMMA)?

Acrylic glass, also known as polymethyl methacrylate or under well-known brand names such as "Plexiglas", is a thermoplastic plastic with excellent light transmission. Visually it appears almost like real glass, but is considerably lighter and easier to process. UV resistance is very high by nature, which is why acrylic glass is particularly valued outdoors. Its relatively high surface hardness ensures good scratch resistance, but compared with polycarbonate it is more brittle and more prone to breakage.

Advantages of acrylic glass:

• Very high light transmission of up to 92%: Ideal for applications requiring maximum brightness.
• UV-stable and colour-fast: Long-term clarity even under strong sunlight.
• Above-average scratch resistance: Less sensitive to abrasion.
• Weather-resistant: Dimensionally stable even in rain, snow and sun.
• Easy processing: Well suited to laser cutting, milling, polishing or bonding.

What is polycarbonate (PC)?

Polycarbonate is an extremely impact-resistant plastic that is used in many industrial and safety-relevant areas. Unlike acrylic glass, PC is virtually unbreakable – it even withstands hammer blows. This material property makes polycarbonate the preferred choice for applications where protection or high mechanical stress are the priority. However, it is more susceptible to scratches and is not UV-resistant by nature – special coatings are required here.

Advantages of polycarbonate:

• Extremely high impact resistance: Resistance to breakage under physical stress, for example from stone impact or vandalism.
• Thermally resilient: Service temperatures from -100 to +120 °C without material failure.
• High mechanical strength: Very stable even under dynamic loads.
• Formable at low temperatures: Ideal for cold-bending applications.
• Low susceptibility to stress cracking: Durability even under changing loads.

Direct comparison: acrylic glass vs. polycarbonate

Property	Acrylic glass (PMMA)	Polycarbonate (PC)
Light transmission	approx. 92%	approx. 88%
UV resistance	Very good	Only with UV-protective coating
Impact resistance	Low to medium	Very high
Scratch resistance	Higher than polycarbonate	Lower, tends to scratch
Temperature resistance	-40 to +70 °C	-100 to +120 °C
Machinability	Very good	Good
Price	Cheaper than polycarbonate	More expensive

Areas of application in comparison

Acrylic glass is particularly suitable for:

Advertising installations and illuminated advertising

Thanks to excellent light transmission and UV stability, acrylic glass is the ideal material for illuminated lettering, signs and displays indoors and outdoors.

Decorative applications and design

Thanks to its optical clarity and machinability, acrylic glass is outstandingly suitable for furniture, shelving, privacy screens or artistic installations.

Glazing for greenhouses

Good weather resistance makes acrylic glass a popular choice for roofing, skylights or side walls of greenhouses.

Protective covers and display cases

Acrylic glass protects against dust and contact and at the same time can be used aesthetically and attractively – e.g. for exhibitions, model making or museum pieces.

Polycarbonate is particularly suitable for:

Machine cladding and protective screens

Extreme impact resistance reliably protects against flying parts or operating errors in production environments.

Safety glazing

Whether as burglary protection, viewing windows in vehicles or protective helmet visors – wherever break-proof transparency is required, polycarbonate is used.

Construction cladding with high impact load

Carports, bus stops, bicycle boxes or stadium roofs benefit from the high load-bearing capacity and temperature resistance.

Applications with high temperature fluctuations

Thanks to the wide service range from -100 to +120 °C, polycarbonate remains dimensionally stable and reliable even in frost or heat.

Conclusion: Which plastic is better?

The choice between acrylic glass and polycarbonate depends heavily on the specific requirements.

• Focus on appearance, light transmission and UV resistance? Then acrylic glass is usually the better choice.
• Focus on impact resistance and safety? Then polycarbonate is the more robust solution.

In many cases it can make sense to use both materials in combination or in a differentiated way depending on the area of application. For simple glazing and decorative applications, acrylic glass offers an excellent price-performance ratio. Where, on the other hand, safety and load-bearing capacity are required, polycarbonate plays to its strengths.

FAQ: Common questions about acrylic glass and polycarbonate

Which plastic is more break-proof? Polycarbonate is significantly more impact-resistant and therefore more break-proof than acrylic glass.

Is acrylic glass UV-resistant? Yes, acrylic glass is UV-stable by nature and does not yellow.

Which alternative is easier to process? Both materials can be processed well, but acrylic glass is somewhat easier (e.g. laser cutting, polishing).

Is polycarbonate scratch-resistant? No, polycarbonate is less scratch-resistant than acrylic glass. However, there are scratch-resistant variants with a special coating.

Which is cheaper? Acrylic glass is generally cheaper than polycarbonate.