Sofia Martinez
Fridge shelves are typically made from polystyrene, but can also be made from other plastics such as polypropylene, polyurethane, and ABS. Some people choose to replace their plastic fridge shelves with metal-framed shelves, reusing the glass panel from the original shelving. Plastic is a popular choice for refrigerator shelves due to its lightweight and inexpensive nature, as well as its ability to resist thermal transmission and maintain a cool temperature. Different types of plastics are used in refrigerator construction to fulfill various requirements and design considerations.
| Characteristics | Values |
|---|---|
| Types of Plastic | Polyurethane (PU), Polystyrene (PS), Polypropylene (PP), Styrene-Butadiene-Acrylonitrile Copolymer (ABS), Polyethylene (PE), Polyvinyl Chloride (PVC), Polycarbonate (PC), Polyoxymethylene (POM), Polymethyl Methacrylate (PMMA), Polyamide (PA) |
| Common Uses | Interior door and wall panels, shelves, drawers, insulation, door handles, decorative strips, door seals, lampshades, hinges, display panels, shaft sleeves |
| Benefits | Lightweight, inexpensive, resists thermal transmission, easy to clean, resists swelling and warping, recyclable |
| Replacement Options | Acrylic/Perspex/Plexiglass, metal-framed shelves with glass panels, universal replacement shelves, thicker plastic for strength |
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What You'll Learn
Polyurethane (PU) is used for insulation
Polyurethane (PU) is a class of synthetic polymers that are commonly used to make a variety of insulation materials. It is a generic term that covers a wide range of formulations and applications derived from the reaction of diisocyanate with a polyol. Polyurethane insulation is created when these compounds react and expand, forming a dense, rigid foam with excellent insulation properties.
Polyurethane is used for insulation in refrigerators, forming thin strips that trap air between layers of harder plastics. Its low thermal conductivity makes it ideal for heat insulation, reducing thermal transmission to keep the fridge's interior cool. Additionally, its moisture resistance and air-sealing properties make it suitable for insulating crawl spaces, foundations, and roofs in buildings.
Polyurethane can be applied as a spray foam or rigid board insulation. Spray foam polyurethane is ideal for insulating hard-to-reach areas, irregular shapes, and tight spaces, such as attic spaces and cavity walls. It expands and hardens, creating a seamless barrier and effectively sealing air leaks. On the other hand, rigid board polyurethane insulation is pre-formed and can be easily cut and installed in larger, open areas like walls or roofs. This type of insulation provides superior compressive strength and structural support.
Polyurethane insulation offers several advantages over traditional insulation materials. It exhibits superior thermal resistance due to its higher R-value per inch of thickness, leading to improved energy efficiency and potentially lower energy costs. Additionally, polyurethane's durability and weather resistance give it a longer lifespan than other insulation materials. However, one drawback is the cost, as polyurethane-based insulation materials tend to be more expensive than traditional options.
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Polystyrene (PS) is used for food boxes and bottle holders
Polystyrene (PS) is a versatile plastic that can be rigid or foamed. Pure polystyrene is a colourless, hard plastic with limited flexibility and a relatively low melting point. It is commonly used in food packaging and food service packaging. PS is the most used plastic variety in refrigerator production, accounting for more than 60% of total refrigerator plastic consumption.
In refrigerators, polystyrene is used to form the interior, including the interior door and wall panels, as well as shelves and drawers. Polystyrene is also used to make food boxes and bottle holders. These components are manufactured using injection moulding, resulting in transparent and hard parts.
General-purpose polystyrene (GPPS) is a type of polystyrene with good dimensional stability and low shrinkage. It is used to create food boxes and bottle holders in refrigerators, as it produces a bright and flat finish.
Polystyrene boxes, consisting of both a base and a lid, are commonly used for packaging meats, cheeses, and fish. They provide a safe and hygienic method of packaging these products, and their ability to hold ice and versatility in terms of size make them a popular choice for food packaging.
However, polystyrene has faced criticism due to its environmental impact and health hazards. It does not biodegrade and persists in the environment as microplastics, which can displace food supplies in the oceans. Polystyrene is also based on styrene, a neurotoxin and probable carcinogen. As a result, bans on polystyrene food items have been implemented in various cities, states, and countries worldwide.
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Polypropylene (PP) is used for refrigerator drawers
Polypropylene (PP) is a type of plastic commonly used in refrigerator production. It is strong, lightweight, and cost-effective, making it ideal for refrigerator drawers. PP offers high mechanical strength, chemical resistance, and the ability to withstand temperature fluctuations, ensuring the long-term durability of refrigerator drawers.
PP is a thermoplastic with excellent mechanical properties, a simple production process, and low price. Injection-molded PP products have high toughness and a smooth surface finish. Its good chemical corrosion resistance makes it suitable for use in refrigerators, where it can come into contact with various substances and maintain its integrity.
PP is particularly well-suited for refrigerator drawers due to its strength and durability. Refrigerator drawers need to withstand frequent use and varying weights without warping or breaking. PP's high impact resistance and ability to withstand temperature changes make it an ideal material for this application.
Additionally, PP's lightweight nature contributes to its popularity in refrigerator manufacturing. Its lightweight construction makes it easier to handle and install, while still providing structural integrity to the refrigerator drawers. This lightweight property is advantageous during the transportation and installation of refrigerators, as it reduces the overall weight of the appliance.
The use of PP in refrigerator drawers also offers benefits in terms of design flexibility and cost-effectiveness. Its ease of processing and low price support various manufacturing methods, allowing for complex and precise designs. This enables refrigerator manufacturers to create innovative and aesthetically pleasing drawer designs while maintaining cost efficiency.
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Styrene-butadiene-acrylonitrile copolymer (ABS) is used for door handles
Styrene-butadiene-acrylonitrile copolymer (ABS) is a commonly used plastic in refrigerator production. It is a commercially important amorphous copolymer with excellent comprehensive properties, including high strength, good gloss, easy processability, and low product shrinkage. ABS is composed of acrylonitrile, butadiene, and styrene, each contributing desirable characteristics to the polymer. Acrylonitrile provides good chemical resistance, aging resistance, hardness, gloss, and rigidity. Butadiene offers ductility at low temperatures, flexibility, and good melt strength. Styrene enhances processability, gloss, and hardness.
In refrigerators, ABS is primarily used for processing appearance parts, such as door handles and decorative strips. The choice of ABS for these components is due to its high strength, impact resistance, and toughness. ABS is also versatile, allowing manufacturers to customize its properties by varying the ratios of its monomer units. This versatility enables the production of ABS with specific characteristics, such as improved impact resistance or heat resistance, making it suitable for door handles that require durability and a visually appealing finish.
The versatility of ABS extends beyond refrigerator door handles. It is widely used in various industries and applications, including automotive components, helmets, pipes, fittings, appliances, sports equipment, and medical equipment. ABS is valued for its ability to provide rigidity and customizable color matching, making it ideal for parts that require specific mechanical and aesthetic qualities.
While ABS offers numerous advantages, it is important to consider its limitations. ABS is flammable when exposed to high temperatures, such as those generated by a wood fire. At approximately 400°C (750°F), ABS can decompose into its constituents: butadiene, acrylonitrile, and styrene, which have potential health risks. Additionally, ABS exhibits poor resistance to certain solvents, alcohols, and aldehydes.
Overall, the selection of ABS for refrigerator door handles is based on its combination of mechanical properties, processability, and versatility. By tailoring the ratios of its monomers, manufacturers can produce ABS with the desired characteristics for specific applications, making it a valuable material in the production of refrigerator components and beyond.
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Polyethylene (PE) is the most-produced plastic variety
Polyethylene is a versatile synthetic resin made from the polymerization of ethylene. It is a member of the polyolefin resins family. Its properties depend on the type and number of chain branches, which in turn depend on the process used: either the high-pressure process (only PE-LD) or the low-pressure process (all other PE grades). Low-density polyethylene (LDPE) is produced by the high-pressure process, resulting in a flexible material with both long and short chain branches. LDPE's principal uses are in packaging film, trash and grocery bags, agricultural mulch, wire and cable insulation, squeeze bottles, toys, and housewares.
High-density polyethylene (HDPE) is another form of polyethylene with a wide range of applications. It is used in water pipes, gas pipes, sewer pipes, hoses, and fittings, offering excellent resistance to chemicals and hydrolysis. HDPE is also used to manufacture crates, trays, bottle caps, drums, and other products.
Linear polyethylene can be produced in ultrahigh-molecular-weight versions, with molecular weights of 3,000,000 to 6,000,000 atomic units. These polymers can be spun into fibres with high stiffness and tensile strength, making them suitable for bulletproof vests. Polyethylene can also be modified to exhibit elastic properties similar to rubber.
Overall, polyethylene's versatility, durability, and ability to be engineered for specific requirements make it a widely used plastic across various industries.
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Frequently asked questions
Fridge shelves are typically made from polystyrene, ABS (acrylonitrile butadiene styrene), polypropylene, or polyurethane.
Polystyrene is the most commonly used plastic variety in refrigerator production, accounting for more than 60% of total refrigerator plastic consumption. It is used to manufacture transparent and hard parts in refrigerators, such as food boxes and bottle holders.
ABS plastic is used to process appearance parts in refrigerators, such as door handles and decorative strips. It has excellent properties such as high strength, good gloss, easy processing, and low product shrinkage.
Polypropylene is used in refrigerator production due to its good mechanical properties, simple production process, and low price. It is commonly used to manufacture refrigerator drawers.
