Plastic moulds

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Names for plastic injection molding materials sound like terms from chemistry class. It is difficult enough to remember that polyethylene rhymes well with polypropylene. This abbreviation (PP), is similar to polystyrene. Knowing your application requirements is key to choosing the right injection molding material. These can change between prototyping or production. To make the best material selection, you don’t necessarily need to have a PhD in Chemistry. Although there are many factors that you need to consider, it is important to start with the basics. Names and abbreviations for the most popular materials, their benefits and disadvantages, as well as common brands and grades. These are the ten most commonly used plastic injection molding material: Acrylic (PMMA). acrylonitrile butadiene styrene (ABS) nylon polyamide (PA) The following sections will explain each type of injection-molded plastic. Acrylic (PMMA). Poly(methyl methacrylate), also known as acrylic or PMMA, is a form of poly(methyl methacrylate). It is a strong, transparent thermoplastic that offers a lightweight, shatter-resistant, and stronger alternative to glass. PMMA is transparent, which allows for a high degree of light to pass through. Acrylics: Advantages and disadvantages Acrylics are strong enough to withstand heavy loads and won't absorb odors. They can also be held in tight tolerances when injection molding is done. Acrylics are also resistant to sunlight and weather making them suitable for outdoor use. PMMA doesn't react with water and won't release Bisphenol A, a chemical found in many plastics that can have adverse effects on the human health. Acrylics are subject to some limitations. Acrylics are more expensive than glass and scratch faster. Grease and oils can stain them easily. PMMA's service temperature is too low to be used in some industrial applications. Injected molded acrylic is not resistant to solvents and can crack under heavy loads. PMMA Applications, Grades and Brands Acrylics can be used in greenhouses, solar panels and bathroom enclosures. If you look closely, you can see the pin marks from the acrylic hinge. The most affordable type of PMMA is general-purpose acrylic. It's used for commodity products and not in engineering applications. Sign-grade acrylic can withstand 10 times more than general-purpose acrylic. It also provides excellent light transmission for outdoor signage. Boat builders often use marine-grade acrylic because it resists water damage. Acrylic plastics are also known by the common names Trinseo (r) and DuPont LUCITE (r) which have excellent optical clarity and transparency. Acrylonitrile Butadiene Styrene (ABS) ABS thermoplastic is an engineering-grade thermoplastic that has a low melting point, making it easy to mold. This opaque polymer can be used with colorants. It is also available in different textures and surface finishes. ABS is well-known for its strength, impact resistance, and durability. ABS Advantages and Disadvantages ABS is strong, inexpensive, and resistant to heat, oils and acids. The ABS's styrene component gives injection-molded parts a shiny, appealing finish. Its butadiene content provides exceptional toughness at low temperatures. ABS is not suitable for outdoor use because it lacks weather and sunlight resistance. ABS is also prone to producing significant smoke from its combustion, has poor resistance to high friction and is not resistant to solvents like water. ABS Applications, Grades and Brands Injection-molded ABS is used for electronic components, keyboard keys, protective headphones, plastic wall plates for electric outlets and automotive components like dashboards, wheels covers and other body parts. Other applications include consumer goods and sport equipment as well as industrial fittings. A computer keyboard with keys made from injection-molded ABS ABS is used for molding keys for keyboards. Some of the most well-known brands for ABS plastics are Samsung Starex(r), Toray Toylac (r), BASF Terluran (r) and Ineos Lustran (r). These brands come in different forms. For added strength and low-temperature impact resistance, ABS can be mixed with glass fillers or polycarbonate. Some suppliers offer both filled ABS plastics and unfilled ABS plastics. Nylon Polyamide (PA). The polyamides (PA), a broad range of materials, can either be synthetic or natural. However, nylon, a type polyimide, can be synthetic. Nylon is susceptible to shrinkage and can require insufficient filling.
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