HDPE Vs. Acrylic Plastic: Breaking Down the Pros and Cons

HDPE Plastic, also known as high-density Polyethylene, triggers a higher level of durability and strength in the final production. HDPE is popular among plastic-item manufacturers. Acrylic, also known as Polymethyl methacrylate, has a short form: PMMA. This transparent thermoplastic material is considered versatile and used in various industries, such as glass manufacturing and paint production.

Understanding the context of HDPE Vs. Acrylic is crucial for product design, determining the production cost of associated final products, projecting requirements against potential outputs, and more. This article informs the pros and cons of each material to assist engineers, designers, and manufacturers in the suitable material selection process.

HDPE Plastic: Everything you need to know

The invention of HDPE includes two stages. First, in 1951, Paul Hogan and Robert Banks discovered the polymerization process of producing polypropylene. Second, in 1953, Nobel Prize winner Karl Ziegler used their concept and foundational research to produce HDPE.

At present, slurry polymerization is used to produce HDPE. In this case, intense heat is applied to petroleum, forming ethylene. Then, the slurry is made by mixing a catalyst and a small amount of liquid ethylene in a reactor. Finally, earlier produced ethylene gas is inserted into the reactor to polymerize the monomers. And the HDPE particles are formed.

Common Characteristics of HDPE Plastic

High-density polyethylene showcases various base characteristics you must know to understand this material better.

HDPE has some superior properties, like a higher degree of stiffness, strength, and toughness.
It showcases resistive characteristics against almost every common chemical: water, solvents, acids, etc.
This material has weather-resistive properties. It also has excellent resistance to UV radiation.
HDPE’s moisture absorption rate is very low. Even in high-humidity environments, it remains unaffected by moisture.
HDPE is recyclable. Old HDPE items are usually melted down to form the refined polymer.

Common Applications of HDPE Plastic

Below are the most common applications of HDPE Plastic in various industries.

HDPE is widely used in packaging. It is used to manufacture bottles, containers, caps, and lids.
HDPE is used for the pipes and fittings in water supply systems, sewage, drainage systems, agricultural irrigation, and gas distribution.
HDPE is also used in the construction and telecommunication industries. Here, it facilitates underground cabling protection, insulation for electrical cables, etc.
HDPE’s weather-resistant property makes it highly suitable for manufacturing outdoor furniture, playground equipment, and park benches.
The associated toughness, stiffness, and strength allow automotive manufacturers to use this material in auto parts. HDPE is used in automotive applications like fuel tanks, bumper beams, interior components, etc.

Advantages of HDPE Plastic

Below are the advantages of using HDPE to manufacture the respective products.

It is cost-effective and highly affordable.
HDPE is approved by the U.S. Food and Drug Administration (FDA) for food contact applications.
HDPE is highly recyclable and can be reprocessed to produce new products.
HDPE can be welded by using hot-gas welding, notch welding, bend welding, etc.

Disadvantages of HDPE Plastic

Below is a list of disadvantages associated with HDPE.

HDPE is not biodegradable. It takes centuries to be decomposed.
High thermal expansion and flammability.

Acrylic Plastic: Everything You Need to Know

In 1928, German chemist and engineer Otto Haas and his team created the first clear and solid form of Acrylic by polymerizing methyl methacrylate. In 1933, they commercially marketed this material under the trademark “PLEXIGLAS.”

Typically, two procedures are applied to produce Acrylic: bulk and suppression polymerization. However, bulk polymerization is commonly used. In this process, the polymerization of monomer methyl methacrylate (MMA) and a catalyst like organic peroxide occurs. Second, this mixture is carefully mixed, poured, and sealed into a mold to apply controlled heating.

Common Characteristics of Acrylic Plastic

Below are the must-know characteristics of Acrylic Plastic.

The acrylic sheet has exceptional optical clarity. You can say the transparency level is similar to glass.
It exhibits remarkable strength and stiffness.
It forms a solid bond with adhesives and solvents.
Acrylic provides good resistance against chemicals like acids, alkaloids, etc.
Acrylic is highly suitable for machining. It can be cut, drilled, etc.
Acrylic can be easily molded and thermoformed to get various shapes and sizes.

Common Applications of Acrylic Plastic

Here, we list the typical applications of Acrylic.

Acrylic is widely used for creating signs, displays, LCD screens, etc.
It is also used in construction applications such as skylights, canopies, and windows.
In the automotive industry, this material is used to produce headlamps, tail lights, etc.
Acrylic is commonly used for light diffusers, lenses, and lighting panels.
It is used to create various artifacts.

Advantages of Acrylic Plastic

The following are the advantages of using Acrylic in various product productions.

Makes the product impact and weather-resistant.
It can be fabricated easily.
It can be pigmented with various colors.
It is cost-effective and offers durability.
More than 90% light transmittance.
Higher scratch resistance than polycarbonate plastic.
It can be used as Infrared Transmitting plastic;

Disadvantages of Acrylic Plastic

Here are some cons of Acrylic plastic:

Low high impact resistance;
Acrylic will be soft at high working temperatures;
High tolerance in thickness for cast acrylic;
High shrinking percentage when thermal forming;

Comparison Between HDPE Vs. acrylic Plastic

Type	HDPE	Acrylic
Short description	HDPE is high-density Polyethylene	Acrylic is a transparent thermoplastic material
What ingredients used to make this	Liquid and gas ethylene from petroleum, catalysts	Monomer methyl methacrylate (MMA) and a catalyst like organic peroxide
Applications	HDPE is used to manufacture pipes, bottles, lids, auto parts, trash bins, etc.	Acrylic is used to produce vehicle’s lights, skylights, windows, etc.
Characteristics	It provides a higher degree of strength, stiffness, and durability. It has a low moisture absorption rate. And recyclable.	Transparent, strong, and stiff. It is also resistant to various chemicals.
Trade Name	HiTec, Playboard, King Colorboard, Paxon, etc.	Crylux, Hesalite, Plexiglas, Acrylite, etc.
Price	Per Ton price is $1,143 to $1,250	Per Ton price is $2,350 to $2,550

Final Words

HDPE plastic differs from acrylic plastic, but some plastic parts/components can be made from either. Acrylic plastic will be the correct material if you need transparent plastic parts, but HDPE will be the suitable material if you need abrasion-resistant components.

If you don’t know which to choose for your project, please get in touch with UVTECO. As an expert in material and machining solutions, UVTECO is a trustworthy supplier of HDPE and acrylic plastic from China, and we will help you to choose the right material for your projects.