Plexiglass vs. Polycarbonate

Attribute	Plexiglass	Polycarbonate
Transparency	High	High
Impact Resistance	Low	High
Flexibility	Low	High
Scratch Resistance	Low	High
UV Resistance	Low	High
Chemical Resistance	High	High
Cost	Low	High

Introduction

When it comes to choosing the right material for various applications, two popular options that often come to mind are plexiglass and polycarbonate. Both materials have unique attributes that make them suitable for different purposes. In this article, we will delve into the characteristics of plexiglass and polycarbonate, comparing their strengths and weaknesses to help you make an informed decision.

1. Transparency and Clarity

One of the primary considerations when selecting a material is its transparency and clarity. Plexiglass, also known as acrylic, offers exceptional optical clarity, allowing for excellent light transmission. It provides a high level of transparency, making it an ideal choice for applications where visibility is crucial, such as windows, signage, and display cases.

On the other hand, polycarbonate offers similar transparency to plexiglass but with a slight difference. Polycarbonate has a higher refractive index, which means it can bend light more effectively. This attribute makes polycarbonate a preferred choice for applications that require enhanced light diffusion, such as LED light covers or light fixtures.

2. Impact Resistance

When it comes to impact resistance, polycarbonate takes the lead. Polycarbonate is an incredibly durable material, known for its exceptional strength and toughness. It is virtually unbreakable, making it an excellent choice for applications that require resistance to impact, such as safety goggles, protective shields, or bulletproof windows.

Plexiglass, while still relatively strong, is more prone to cracking and shattering upon impact compared to polycarbonate. However, it is worth noting that plexiglass can be manufactured with added impact modifiers to enhance its resistance, making it suitable for applications where a balance between impact resistance and optical clarity is required.

3. Chemical Resistance

When it comes to chemical resistance, plexiglass has an advantage over polycarbonate. Plexiglass is highly resistant to many chemicals, including acids, bases, and solvents. This attribute makes it a preferred choice for applications that involve exposure to various chemicals, such as laboratory equipment, chemical storage containers, or protective barriers in chemical processing plants.

Polycarbonate, on the other hand, is more susceptible to chemical attack. It may experience degradation or discoloration when exposed to certain chemicals, limiting its suitability for applications where chemical resistance is a critical requirement.

4. Temperature Resistance

Both plexiglass and polycarbonate exhibit different temperature resistance properties. Plexiglass has a lower melting point compared to polycarbonate, making it more susceptible to heat. It begins to soften around 180°C (356°F) and can deform under prolonged exposure to high temperatures.

Polycarbonate, on the other hand, has a higher melting point and can withstand higher temperatures without significant deformation. It remains stable up to approximately 240°C (464°F), making it suitable for applications that involve exposure to heat or require thermal stability.

5. UV Resistance

When it comes to UV resistance, both plexiglass and polycarbonate offer excellent protection against harmful UV radiation. However, plexiglass has a slight advantage in terms of long-term UV stability. It has better resistance to yellowing and degradation caused by prolonged exposure to sunlight, making it a preferred choice for outdoor applications such as windows, skylights, or protective covers for outdoor equipment.

Polycarbonate, while still providing good UV resistance, may experience some yellowing or degradation over time when exposed to direct sunlight. However, this can be mitigated by applying UV protective coatings or using UV-stabilized grades of polycarbonate.

Conclusion

Both plexiglass and polycarbonate have their unique attributes that make them suitable for various applications. Plexiglass offers exceptional transparency and clarity, making it ideal for applications where visibility is crucial. On the other hand, polycarbonate excels in impact resistance and can withstand high temperatures, making it a preferred choice for applications that require durability and thermal stability.

Ultimately, the choice between plexiglass and polycarbonate depends on the specific requirements of your application. Consider factors such as transparency, impact resistance, chemical resistance, temperature resistance, and UV stability to make an informed decision. Consulting with material experts or suppliers can also provide valuable insights to help you select the most suitable material for your project.