Chloe Zhang
Plexiglass and plastic are often used interchangeably, but they are not the same thing. Plexiglass is a type of plastic, specifically a form of acrylic, and is a generic term used to describe the name brand and the material itself. Plexiglass is a trademarked term for acrylic sheets, which are a common alternative to traditional glass. Acrylic is a robust plastic material that exhibits glass-like qualities at half the weight with up to 10 times the impact resistance. It is made from polymethyl methacrylate (PMMA), a thermoplastic chemical invented in the early 1900s by Otto Rohm, the founder of Rohm and Haas. To differentiate plexiglass from other plastics, you can try scuffing the surface lightly; if it scratches easily, it's plexiglass (acrylic).
Plexiglass vs Plastic
| Characteristics | Values |
|---|---|
| Material | Plexiglass is made of polymethyl methacrylate (PMMA), a thermoplastic. |
| Manufacturing Process | Plexiglass is made via cell casting or extrusion. |
| Appearance | Plexiglass is transparent. |
| Strength | Plexiglass is strong and shatterproof. |
| Weight | Plexiglass is half the weight of glass. |
| Durability | Plexiglass is durable and resistant to scratches. |
| Flexibility | Plexiglass is flexible and can be bent without breaking. |
| Heat Capacity | Plexiglass warms up quickly when touched. |
| Sound | Plexiglass produces a dull sound when struck with an object. |
| Reaction to Acetone | Plexiglass dissolves in acetone. |
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What You'll Learn
Plexiglass and acrylic are interchangeable terms
Plexiglass and acrylic are indeed interchangeable terms. Plexiglass is a generic term used to describe both the name brand and the material itself. The name brand, Plexiglas®, is a registered trademark for acrylic sheets. The chemical name for the material is polymethylmethacrylate (PMMA).
The terms are used in different contexts, which creates the impression that they refer to distinct products. However, this distinction is a result of branding and marketing strategies rather than material differences. The material we call acrylic or plexiglass is a thermoplastic homopolymer with unique properties that make it ideal for a variety of purposes. It is transparent, durable, and lightweight, making it a reliable choice for outdoor applications. It is also shatter-resistant and safer than glass, as it fractures into dull-edged pieces instead of sharp shards.
The history of Plexiglas® and plexiglass is as follows: polymethyl methacrylate (PMMA) was invented in the early 1900s by Otto Rohm, founder of Rohm and Haas. In 1902, he first polymerized methyl methacrylate (MMA), which laid the foundation for plexiglass. However, it wasn't until 1933 that the company patented and registered the brand name Plexiglas®. Acrylic, or plexiglass, was first produced in 1928 and brought to market around 1933. The name plexiglass did not appear until years after Plexiglas® dominated the glass and plastics industries.
The manufacturing process for acrylic sheets involves either extrusion or cell casting. Plexiglas® is made only via the cell casting technique, which is more strenuous and costly than extrusion but produces a higher-quality and more durable product. Acrylic sheets are created by forming a "syrup" of MMA monomer and other additives. This syrup is then heated and fed between two rollers until it reaches the desired thickness. Quality control is paramount in the production process to ensure the finished material meets customers' standards.
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Plexiglas® is a trademarked term
Plexiglas® is a registered trademark for acrylic sheets, which are made from polymethyl methacrylate (PMMA). The chemical that constitutes this thermoplastic was discovered in the early 1900s by Otto Rohm, the founder of Rohm and Haas. At the time, Rohm was aiming to increase the resistance of glass by creating a lamination between glass plates, but he inadvertently created a new material—acrylic.
In 1932, Rohm produced the first PMMA cast sheet, and in 1933, he created a stable, transparent, hard, shatterproof polymer, which was registered under the Plexiglas® trademark. The brand name Plexiglas® quickly became synonymous with acrylic sheets due to its widespread use and high-quality products. However, the term "plexiglass" with two "s's" is a generic term used interchangeably to refer to both the name brand Plexiglas® and the material itself (acrylic). This can lead to confusion when shopping for acrylic sheeting, as the two terms are pronounced the same and differ by only one letter in spelling.
Plexiglas® is a branded product from POLYVANTIS GmbH, and only the original product from this company can carry the Plexiglas® name. The brand is known for its reliably high quality, prominence, and availability, and has been named a "Brand of the Century" since 2007. Acrylic sheets manufactured by other companies can be referred to as plexiglass, but not as Plexiglas®.
Plexiglass and acrylic are two names for the same material, polymethyl methacrylate, and refer to the way the material is manufactured—extruded versus cast. Plexiglass is created through a process called cell casting, where a liquid mixture of methyl methacrylate (MMA) monomer and other additives is heated and fed between two rollers until it reaches the desired thickness. This results in a solid material with the unique combination of clarity, strength, and lightness associated with plexiglass.
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Acrylic is a type of plastic
Acrylic is a thermoplastic that is petroleum-based and derived from natural glass. It is also known as polyacrylate. Acrylic is a clear plastic, and clear plastic is one of the most common materials used in manufacturing. It is often chosen as an alternative to glass when traditional glass is too heavy or fragile.
Acrylic is a popular alternative to glass because it is strong, durable, and lightweight. It can be manufactured by injecting acrylic or polymethyl methacrylate into a mould, or through a process known as cell casting. In the early 1900s, German chemist Otto Rohm created a new material, acrylic, while trying to increase the resistance of glass by creating a lamination between glass plates. In 1933, Rohm and his company, Rohm and Haas AG, patented and registered the brand name Plexiglas.
Plexiglass is a generic term used interchangeably to describe both the name brand Plexiglas and the material itself. Plexiglas is a trademarked material, while plexiglass can refer to materials manufactured by either cell casting or extrusion. Acrylic sheeting is commonly referred to as plexiglass sheeting and is the most common alternative to traditional glass.
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Plexiglas® is harder than plexiglass
Plexiglass, or acrylic, was invented in the early 1900s by Otto Rohm, founder of Rohm and Haas. He was attempting to increase the resistance of glass by creating a lamination between glass plates when he accidentally created a new material. In 1932, Rohm produced the first polymethyl methacrylate (PMMA) cast sheet, and in 1933, he produced a stable, transparent, hard, shatterproof polymer, which they registered under the Plexiglas® trademark.
The Plexiglas® brand quickly became synonymous with acrylic sheets due to its widespread use and high-quality products. The name was adjusted to "plexiglass" in the United States, and the term "plexiglass" soon dominated the glass and plastics industries. However, it is important to note that the term "plexiglass" is a generic trademark for Plexiglas®, and there are differences in the way the two products are manufactured.
While Plexiglas® is harder and more scratch-resistant than plexiglass, plexiglass has its own advantages. Plexiglass is more shatter-resistant than glass, making it useful for applications where shatter resistance is important, such as windshields or drinking glasses. However, plexiglass scratches very easily, stains, warps, discolours, and becomes brittle with age. It is also more expensive, less environmentally friendly, and has potential toxic by-products.
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Plexiglass is shatterproof
Plexiglass is a shatterproof alternative to traditional glass. It is a thermoplastic homopolymer, technically known as polymethyl methacrylate (PMMA), but also referred to as acrylic. Plexiglass was invented in the early 1900s by Otto Rohm, who was attempting to increase the shatter resistance of glass by creating a lamination between glass plates. In 1933, he produced a stable, transparent, hard, and shatterproof polymer, which was registered under the Plexiglas® trademark.
Plexiglass is a generic term used interchangeably to describe both the name brand and the material itself. The name "plexiglass" is derived from the trademarked name "Plexiglas®", with the difference being that Plexiglas® is made only via cell cast, while plexiglass can refer to materials manufactured by either cell casting or extrusion.
Plexiglass is highly resistant to shattering. When it does break, it tends to crack or splinter into larger, dull-edged pieces, making it safer than glass in environments where impact resistance is crucial. This shatter-resistant quality makes plexiglass ideal for use in windows, especially in commercial buildings, as well as in aquariums, shower doors, bullet-resistant barriers, and anywhere that requires impact resistance.
Plexiglass is also known for its transparency, durability, and lightweight nature. It allows over 90% of light to pass through, providing better clarity than glass. It is easier to handle, transport, and install due to its lighter weight, making it useful for aircraft and automobile parts. Plexiglass is also resistant to a wide range of chemicals, making it suitable for use in laboratories and industrial settings.
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Frequently asked questions
Plexiglass is a type of plastic, so telling them apart can be tricky. One way to differentiate them is by checking how easily the surface of the material scratches. If it scratches easily, it's likely plexiglass (acrylic). If it doesn't scratch easily, it's probably another type of plastic.
Plexiglass is made from polymethyl methacrylate (PMMA), a type of thermoplastic.
Plexiglass is a generic term used to describe both the name brand Plexiglas® and the material itself (acrylic). Plexiglas® is a trademarked material made via cell casting, while plexiglass can be manufactured via cell casting or extrusion.
Glass and plastic have different thermal properties. Glass will feel colder to the touch and warm up more slowly when exposed to heat. Plastic will quickly warm to your hand and feel less cold when touched. Striking glass with an object will also produce a ringing sound, while plastic will make a dull clicking sound.
