Alexei Volkov
Fridge shelves are typically made from polystyrene, but acrylic, polyurethane, polypropylene, and polyethylene are also used. Acrylic is a popular choice for replacement fridge shelves due to its durability, transparency, and ability to be cut to precise measurements. Polycarbonate is also used for fridge shelves, but it is not suitable for direct contact with food due to the presence of Bisphenol residues. When choosing a replacement shelf, it is important to consider the weight it needs to support and the temperature range it needs to withstand.
| Characteristics | Values |
|---|---|
| Main types of plastic used in refrigerators | Polyurethane (PU), Polystyrene (PS), Polypropylene (PP), Styrene-butadiene-acrylonitrile copolymer (ABS), Polyethylene (PE) |
| Polystyrene types | General-purpose polystyrene (GPPS), High-impact polystyrene (HIPS), Expandable polystyrene (EPS) |
| Plastic parts used for | Interior door and wall panels, shelves, drawers, insulation, pipes, door seals, lampshades, hinges, display panels, shaft sleeves |
| Acrylic shelves advantages | Durability, transparency, ability to be made to precise measurements, lightweight, strong, clear, hassle-free buying, quick installation |
| Acrylic shelves disadvantages | Cannot withstand direct heat from pans or dishes |
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What You'll Learn
Fridge shelves are often made from strong acrylic plastic
Fridge shelves are designed to hold a lot of weight, from heavy beverages to bulky fruits and vegetables. To accommodate these items, fridge shelves are often made from strong acrylic plastic. Acrylic is stiff and can handle large amounts of weight, making it ideal for fridge shelves. However, even the strongest acrylic is not indestructible, and over time, a shelf may experience cracks or fractures.
While some plastics, like polycarbonate, are tougher, acrylic is stiffer and easier to line-bend. Acrylic also has a wider temperature band between softening and scorching, which is important for a material used in refrigerators.
That being said, polycarbonate is also used in refrigerators, mainly for door seals, lampshades, hinges, display panels, and shaft sleeves. Polycarbonate is a common plastic in refrigerator production, along with polyvinyl chloride (PVC), polyoxymethylene (POM), polymethyl methacrylate (PMMA), and polyamide (PA).
Other types of plastics used in refrigerators include polyurethane (PU), polystyrene (PS), polypropylene (PP), styrene-butadene-acrylonitrile copolymer (ABS), and polyethylene (PE). These plastics are used for various functions, ensuring efficiency, safety, and recyclability. For example, polyurethane foam is used for insulation in refrigerator doors and boxes due to its low thermal conductivity and good processing performance.
While acrylic is a common material for fridge shelves, it is not the only option. Some fridges have glass shelves with plastic edge protection to prevent small chips from becoming more significant issues. Additionally, repairs can be made to cracked or damaged shelves using glue and metal plates, though these fixes may not last forever.
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Polyurethane is used for insulation in fridges
Polyurethane is widely used for insulation in fridges and freezers. Polyurethane foam is an excellent insulator due to its low thermal conductivity, providing a large useful space for consumers. This makes it ideal for the low-temperature preservation of food. Polyurethane is also used for refrigerator housing, providing design qualities such as impeccable finishes and structural strength.
Polyurethane is a critical component in modern refrigerators, with virtually all fridges manufactured worldwide using it for insulation. Its introduction has significantly improved energy efficiency, making today's models up to 60% more efficient than refrigerators from 15 years ago. This contributes to sustainability and eco-design by reducing the energy required to keep refrigerators cold.
The use of polyurethane in refrigerator insulation began in the mid-1980s, replacing fiberglass insulation, which was prone to failure. Polyurethane is applied as a liquid during the manufacturing process, expanding rapidly to fill the space between the steel outer case and the inner plastic liner. This creates an extremely airtight seal, preventing heat exchange between the interior and exterior of the fridge.
The adhesive properties of polyurethane ensure a firm bond between the inner and outer walls of the refrigerator, enhancing its structural integrity. Additionally, the material's long service life and recyclability make it a practical and cost-effective choice for refrigerator insulation.
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Polystyrene is the most used plastic variety in fridge production
A typical refrigerator uses several different types of plastic, including ABS, polypropylene, high-impact polystyrene, polycarbonate, and foamed polyurethane. Each plastic has its own unique properties, such as strength, flexibility, and insulation. Polystyrene (PS) is the most commonly used plastic variety in refrigerator production, accounting for more than 60% of total refrigerator plastic consumption.
Polystyrene is a versatile plastic that can be categorized into three main types: general-purpose polystyrene (GPPS), high-impact polystyrene (HIPS), and expandable polystyrene (EPS). GPPS is known for its good dimensional stability and low shrinkage, making it ideal for injection molding processes. In refrigerators, GPPS is used to create transparent and hard parts such as food boxes and bottle holders. These components directly face consumers, so manufacturers ensure that GPPS products have a bright and flat appearance.
HIPS is a modified version of polystyrene that combines high strength and easy processability with good impact resistance and ductility after heating. In refrigerator production, HIPS is primarily used for manufacturing the inner liner and door lining. The vacuum adsorption molding method is commonly employed for this purpose. Additionally, the foamed structure of EPS provides excellent shock absorption, making it suitable for packaging and transportation of finished refrigerators.
Polystyrene is favored in refrigerator production due to its advantageous properties. Its high strength and impact resistance contribute to the durability of refrigerator components. Moreover, polystyrene offers easy processability, facilitating injection molding and vacuum adsorption molding techniques used in refrigerator manufacturing. The glossy surface of polystyrene also enhances the aesthetic appeal of refrigerator parts, aligning with consumer expectations.
In summary, polystyrene is the predominant plastic variety used in refrigerator production, and its consumption exceeds 60% of total refrigerator plastic usage. The versatility, strength, and processability of polystyrene, along with its impact resistance and aesthetic qualities, make it a preferred choice for refrigerator manufacturers. By leveraging different types of polystyrene, such as GPPS, HIPS, and EPS, refrigerator producers can fabricate a range of parts, from transparent food boxes to shock-absorbent packaging materials.
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Polyethylene is the most produced plastic variety
Fridge shelves are made from a variety of plastics, including polyethylene (PE), polypropylene (PP), polystyrene (PS), styrene-butadiene-acrylonitrile copolymer (ABS), and polyurethane (PU). These plastics are used for different parts of the refrigerator, such as the insulation layer, pipes, and shelves. Polyethylene, specifically, is the most produced plastic variety, with a range of useful properties and applications.
Polyethylene is a versatile plastic with a wide range of applications. It is commonly used in product packaging, such as plastic bags, containers, bottles, and jars. It is also used in geomembranes, agricultural pipes, and other products like playground equipment and shampoo bottles. One of its key advantages is its chemical resilience, making it a popular multi-use plastic. However, this same property also contributes to environmental concerns, as it is challenging to decompose and can persist as a pollutant if not disposed of properly.
Polyethylene is produced through two main processes: the high-pressure process and the low-pressure process. The high-pressure process results in low-density polyethylene (LDPE), which has numerous short and long chain branches. LDPE is known for its flexibility and ease of production. On the other hand, the low-pressure process yields all other PE grades, including high-density polyethylene (HDPE). HDPE is stronger and thicker than LDPE due to its long unbranched polymer chains. It is also resistant to impact and can withstand temperatures of up to 120°C.
As of 2017, over 100 million tonnes of polyethylene resins were being produced annually, accounting for approximately one-third of the global plastics market. This high production volume is due to the versatility and desirable properties of polyethylene. However, its widespread use has also led to waste management challenges, as polyethylene is not readily biodegradable. Efforts are being made to improve recycling and develop more effective methods for degrading polyethylene to address these issues.
In summary, polyethylene is the most produced plastic variety due to its versatility, ease of production, and desirable properties. However, its chemical resilience and persistence in the environment have raised concerns about its impact on waste management and pollution. As a result, there is a growing focus on recycling and biodegradation solutions to address these challenges associated with polyethylene and other plastics.
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Polycarbonate is a good option for replacement fridge shelves
Fridge shelves are made from a variety of plastics, including polyurethane (PU), polystyrene (PS), polypropylene (PP), styrene-butadiene-acrylonitrile copolymer (ABS), and polyethylene (PE). Polyethylene (PE) is the most commonly produced plastic, and is used in refrigerators for its good impact resistance, chemical resistance, and low water permeability. Polycarbonate (PC) is another plastic commonly used in refrigerators, mainly for door seals, lampshades, hinges, display panels, and shaft sleeves.
One potential concern with polycarbonate is the presence of BPA or BPS, which can be problematic when the plastic is heated. However, as long as food is washed before consumption, the risk of any negative effects from these chemicals is minimal.
When choosing a replacement fridge shelf, it is important to consider the original shelf's features, such as rigidity and thickness. Polycarbonate may not always be able to replicate the exact characteristics of the original shelf, especially if it has bends and ridges that contribute to its strength. In such cases, it may be necessary to laminate the polycarbonate with another material, such as glass, to achieve the desired rigidity.
Overall, polycarbonate is a durable and safe option for replacement fridge shelves, offering good impact resistance and the ability to withstand heavy weights. With proper care and handling, polycarbonate shelves can provide a long-lasting solution for refrigerator storage.
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Frequently asked questions
Fridge shelves are typically made from polystyrene, but can also be made from polypropylene, acrylonitrile butadiene styrene (ABS), polyurethane, or polycarbonate.
Plastic shelves are lightweight, inexpensive, and resist thermal transmission, keeping the inside of the fridge cooler for longer. They are also easy to clean and resist swelling and warping when exposed to moisture and temperature changes.
Glass shelves are typically not sold as replacements for plastic fridge shelves. Acrylic or Perspex (plexiglass) are suitable replacement materials, as they are durable, transparent, and can be cut to precise measurements.
A thickness of 5mm is standard for acrylic/Perspex/plexiglass fridge shelves, but a thicker option (e.g. 8mm) may be preferable to prevent flexing when placing bottles on the shelf.
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