What Is The Density Of Acrylic?

Acrylic is a versatile and popular material known for its transparency, strength, and durability. When it comes to density, acrylic has a relatively low density compared to other materials, making it lightweight and easy to handle.

The density of acrylic can vary depending on its specific composition and manufacturing process, but on average, it ranges from 1.17 to 1.20 grams per cubic centimeter (g/cm³). This low density allows acrylic to be easily molded and shaped into various forms, making it a preferred choice in industries such as construction, signage, and manufacturing.

Despite its low density, acrylic maintains excellent optical clarity and weather resistance, making it ideal for applications that require transparency and long-term durability. Its lightweight nature also contributes to its easy installation and transportation, adding to its overall appeal.

Whether it’s used in windows, display cases, or even kitchen splashbacks, the low density of acrylic ensures that it remains a cost-effective and versatile choice for a wide range of applications.

what is the density of acrylic

Importance of Density in Acrylic Products

When it comes to manufacturing and designing acrylic products, one of the crucial factors that needs to be considered is density. Density refers to the mass per unit volume of a material, and it plays a significant role in determining the quality and performance of acrylic products. In this section, we will explore the importance of density in acrylic products and how it affects various aspects of their functionality.

1. Strength and Durability

The density of acrylic directly affects its strength and durability. Higher density acrylic products tend to be stronger and more durable compared to those with lower density. This is because higher density acrylic has a tighter molecular structure, which provides better resistance to impacts, stresses, and wear. Acrylic products with higher density can withstand heavy loads and have a longer lifespan, making them ideal for applications that require high strength and durability.

2. Optical Clarity

Density also plays a crucial role in the optical clarity of acrylic products. Acrylic with higher density has fewer impurities and defects, resulting in superior optical clarity. This is especially important for applications where transparency and visual aesthetics are essential, such as display cases, signage, and architectural applications. Acrylic products with high density offer better light transmission, allowing for a clearer and more vibrant display of the contents.

3. Chemical Resistance

The density of acrylic can also impact its resistance to chemicals and solvents. Higher density acrylic exhibits better resistance to chemical reactions and degradation compared to lower density acrylic. This makes high-density acrylic products suitable for use in environments where they may come into contact with harsh chemicals or solvents. They are less likely to discolor, degrade, or undergo physical changes when exposed to such substances, ensuring long-term durability and performance.

4. Machinability

Density affects the machinability of acrylic materials. Higher density acrylic is generally easier to machine, cut, and shape compared to lower density acrylic. This is because higher density acrylic has a more uniform and consistent structure, allowing for smoother and more precise machining processes. It enables manufacturers to achieve intricate designs and complex shapes with greater ease, resulting in high-quality acrylic products.

5. Thermal Stability

Density also contributes to the thermal stability of acrylic products. Higher density acrylic has better thermal resistance, meaning it can withstand higher temperatures without deforming or warping. This makes high-density acrylic suitable for applications where heat resistance is crucial, such as lighting fixtures, automotive parts, and medical equipment. It ensures that the acrylic products maintain their shape and structural integrity even under high-temperature conditions.

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In summary, density plays a crucial role in determining the quality and performance of acrylic products. From strength and durability to optical clarity, chemical resistance, machinability, and thermal stability, density directly influences various aspects of acrylic products. Manufacturers and designers need to take into account the desired properties and requirements of their applications to choose the appropriate density of acrylic for optimal performance and longevity.

Factors Affecting the Density of Acrylic

Acrylic, also known as polymethyl methacrylate (PMMA), is a versatile and widely used synthetic material. It is known for its transparency, durability, and lightweight nature. The density of acrylic can vary depending on several factors, which are discussed below.

1. Composition

The composition of acrylic plays a significant role in determining its density. Acrylic is composed of polymer chains made up of methyl methacrylate monomers. The density of acrylic can vary depending on the ratio of monomers used in the polymerization process. Different formulations and additives can also impact the density of acrylic.

2. Molecular Weight

The molecular weight of acrylic influences its density. Higher molecular weight acrylic polymers tend to have a higher density compared to lower molecular weight ones. This is because higher molecular weight polymers have more mass per unit volume.

3. Processing Conditions

The processing conditions during the manufacturing of acrylic can affect its density. Factors such as temperature, pressure, and cooling rate can influence the density of the final product. Inadequate control of these processing parameters can result in variations in density.

4. Filling Material

In some cases, acrylic may be filled with additives or reinforcing materials to enhance its properties. These fillers can impact the density of acrylic. For example, the addition of glass fibers can increase the density of acrylic composites.

5. Porosity

The presence of air or voids within the acrylic structure can decrease its density. Porosity can occur due to improper processing techniques or the incorporation of gas bubbles during polymerization. Higher porosity levels result in lower density acrylic.

6. Temperature

The temperature can affect the density of acrylic. Acrylic has a coefficient of thermal expansion, meaning its volume changes with temperature variations. As the temperature increases, the density of acrylic decreases, and vice versa.


Several factors affect the density of acrylic, including its composition, molecular weight, processing conditions, filling material, porosity, and temperature. Understanding these factors is crucial for manufacturers, as it allows them to control and optimize the density of acrylic for specific applications.

Measuring the Density of Acrylic: Methods and Instruments

Acrylic is a versatile and widely used material in various industries, including construction, automotive, and signage. Its density, which refers to the amount of mass packed into a given volume, is an important property that affects its performance and application. In this section, we will explore the methods and instruments used to accurately measure the density of acrylic.

1. Archimedes’ Principle

One of the most common methods for measuring the density of solid objects, including acrylic, is by using Archimedes’ principle. According to this principle, when an object is submerged in a fluid, it experiences a buoyant force equal to the weight of the fluid it displaces. By measuring the buoyant force, the density of the object can be determined.

To measure the density of acrylic using Archimedes’ principle, a special device called a density balance or hydrometer can be used. The acrylic sample is first weighed in air and then immersed in a liquid with a known density, such as water. The change in weight is recorded, and by applying Archimedes’ principle, the density of the acrylic can be calculated.

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2. Density Gradient Column

Another method commonly used to measure the density of acrylic is the density gradient column technique. This method relies on the principle of differential settling, where particles of different densities settle at different rates in a liquid medium.

In this method, a column is filled with a liquid, such as a mixture of water and a heavy liquid with a known density. The acrylic sample is then placed in the column, and its position is observed over time as it settles to a specific density level. By comparing the settling position of the acrylic with the known densities of the liquid layers, the density of the acrylic can be determined.

This method requires a density gradient column apparatus, which consists of a transparent column, a liquid mixture with different densities, and a means to measure the settling position of the acrylic sample.

3. Digital Density Meters

In recent years, digital density meters have gained popularity as a convenient and accurate method for measuring the density of acrylic. These instruments utilize the oscillation or resonance frequency of a vibrating element immersed in a liquid to determine its density.

The acrylic sample is placed in a sample chamber filled with a liquid, and the density meter measures the frequency change of the vibrating element caused by the presence of the acrylic. This frequency change is directly proportional to the density of the liquid and can be converted to the density of the acrylic.

Digital density meters offer several advantages, including high accuracy, quick measurements, and the ability to measure a wide range of sample sizes and types. They are particularly useful in quality control and research laboratories where precise density measurements are required.


Accurately measuring the density of acrylic is essential for ensuring its proper application in various industries. The methods and instruments discussed in this section, such as Archimedes’ principle, density gradient columns, and digital density meters, offer reliable ways to determine the density of acrylic. Whether you prefer traditional techniques or modern digital instruments, there are options available to suit your needs and provide precise measurements.

Applications of Different Density Grades in Acrylic Products

Acrylic, also known as polymethyl methacrylate (PMMA), is a versatile and popular material used in a wide range of applications due to its clarity, durability, and resistance to UV radiation. One of the factors that determines the performance and characteristics of acrylic products is the density grade of the material used. Different density grades of acrylic offer various benefits and are suitable for specific applications. In this section, we will explore the applications of different density grades in acrylic products.

1. Low-Density Acrylic (LD)

Low-density acrylic, also known as extruded acrylic, is a lightweight and cost-effective option with a density range of 1.17 g/cm³ to 1.20 g/cm³. Due to its lower density, it offers excellent transparency, making it suitable for applications where optical clarity is essential. Some common applications of low-density acrylic include:

  • Signage and Displays: Low-density acrylic is often used for creating signage and displays in retail stores, exhibitions, and trade shows. Its lightweight nature makes it easy to handle and install, while its clarity enhances the visibility of promotional messages and graphics.
  • Lighting Fixtures: The excellent light transmission properties of low-density acrylic make it an ideal choice for lighting fixtures, such as diffusers, lenses, and light covers. It helps to distribute light evenly and efficiently.
  • Point-of-Purchase (POP) Displays: POP displays in various shapes and sizes, such as shelves, stands, and product holders, are often made from low-density acrylic. The material’s optical clarity helps showcase products effectively and attract customers.
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2. Medium-Density Acrylic (MD)

Medium-density acrylic, also known as cell cast acrylic, has a density range of 1.19 g/cm³ to 1.23 g/cm³. It offers a good balance between cost, durability, and optical clarity, making it suitable for a wide range of applications. Some common applications of medium-density acrylic include:

  • Architectural Glazing: Medium-density acrylic is often used for windows, skylights, and canopies in architectural applications. Its durability and resistance to weathering make it a popular choice for outdoor installations.
  • Furniture and Decorative Items: Medium-density acrylic is commonly used in the manufacturing of furniture, such as tables, chairs, and shelves. Its aesthetic appeal, combined with its strength and durability, makes it an excellent choice for interior décor items.
  • Medical Equipment: Due to its biocompatibility and resistance to chemicals, medium-density acrylic is commonly used in medical applications. It is used for manufacturing laboratory equipment, medical devices, and protective barriers.

3. High-Density Acrylic (HD)

High-density acrylic, also known as impact-modified acrylic, has a density range of 1.17 g/cm³ to 1.20 g/cm³. It offers enhanced impact resistance and toughness compared to other density grades. Some common applications of high-density acrylic include:

  • Automotive Industry: High-density acrylic is widely used in the automotive industry for manufacturing headlight lenses, interior trims, and instrument panels. Its impact resistance and optical clarity make it suitable for these applications.
  • Safety Equipment: Safety equipment, such as face shields, safety goggles, and machine guards, are often made from high-density acrylic. Its ability to withstand impact and protect against debris makes it an excellent choice for these applications.
  • Outdoor Signage: High-density acrylic is commonly used for outdoor signage, where durability and resistance to harsh weather conditions are crucial. Its impact resistance ensures that the signage remains intact even in challenging environments.

By selecting the appropriate density grade of acrylic, manufacturers can ensure that their products meet the specific requirements of each application. Whether it’s for signage, lighting, furniture, automotive, or safety equipment, acrylic offers a versatile solution with a range of density grades to choose from.


What is the density of acrylic?

The density of acrylic typically ranges from 1.17 to 1.20 grams per cubic centimeter (g/cm³).


In conclusion, the density of acrylic is an important property that affects its performance and applications. With a density of approximately 1.18 g/cm³, acrylic is a lightweight and versatile material. Its low density makes it easier to handle and transport, while also allowing for creative and innovative designs in various industries.

Acrylic’s density also plays a role in its optical properties, as it allows for high transparency and light transmission. This makes it a popular choice for applications such as windows, lenses, and displays. Additionally, its density contributes to its durability and impact resistance, making it suitable for use in protective barriers and signage.

In summary, the density of acrylic enhances its functionality and suitability for a wide range of applications, making it a valuable material in various industries.

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