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What is PC material? What are its advantages and disadvantages?
Advantages of PC PC is an amorphous thermoplastic resin with excellent comprehensive performance. It possesses excellent electrical insulation, elongation, dimensional stability, and chemical corrosion resistance, as well as high strength, heat resistance, and cold resistance. It also has advantages such as self-extinguishing, flame retardancy, non-toxicity, and colorability. PC plastic can be found in almost every aspect of your life. Its large-scale industrial production and ease of...
UV Stabilizers are chemicals used in plastics, coatings, fibers, and other materials to reduce or prevent material aging caused by ultraviolet (UV) radiation. They absorb UV radiation, converting it into harmless heat, or stabilize it through photochemical reactions, thus protecting the material from damage. Here are some common types of UV Stabilizers: UV Absorbers - These compounds absorb UV radiation and convert it into lower-energy heat or harmless wavelengths, thus preventing UV damage...
What are some common problems in injection molding?
Injection molding is a highly efficient and common method for producing plastic parts, but some common problems may arise during actual production, affecting the product's quality, appearance, and function. Here are some common problems encountered during injection molding and their possible causes: Flow marks and burns: Flow marks are linear marks on the plastic surface, often caused by excessively fast material flow or uneven mold temperature; burns are black spots or blemishes caused by...
What are the main materials used in injection-molded optical lenses?
Injection-molded optical lenses are typically made from the following high-transparency plastic materials, each with unique optical and physical properties: 1. Polycarbonate (PC): High impact resistance and good heat resistance. High light transmittance, but sensitive to ultraviolet light. 2. Acrylic (polymethyl methacrylate, PMMA or Acrylic): Also known as plexiglass or Plexiglas (trade name). Excellent light transmittance and weather resistance, more UV resistant than...
PMMI is an abbreviation for Poly(Methyl Methacrylate Isomers), generally referring to a polymer material similar to common polymethyl methacrylate (PMMA, also known as acrylic or plexiglass), but containing different isomers in its molecular structure. PMMI's physical and optical properties are similar to PMMA, but it can have a higher glass transition temperature (Tg), providing better thermal and dimensional stability. In optical lens applications, a higher glass transition temperature...
Which has better toughness, Nylon 6 (PA6) or Nylon 66 (PA6)?
Nylon 6 (polyamide 6, PA6) and Nylon 66 (polyamide 66, PA66) are two of the most common types of polyamides, each with its own unique performance advantages. Toughness generally refers to a material's resistance to fracture; it is less prone to breakage when subjected to external impact. Nylon 6 (PA6) is generally considered to have better toughness than Nylon 66 (PA66), especially in low-temperature environments. The molecular structure of PA6 results in slightly higher hygroscopicity than...
Is there a difference between COP and COC materials?
COP and COC are essentially the same material in the raw material market; they are very similar. The specific difference lies in the grade designation and specifications. COP (Cyclic Olefin Polymer) and COC (Cyclic Olefin Copolymer) are two different thermoplastic polymers commonly used in bioscience, medical devices, and optical applications. Their main differences lie in their molecular structure and performance characteristics. COP materials, or cyclic olefin polymers, are typically...
Which has better weather resistance, EVA or PET?
"Eva" usually refers to ethylene-vinyl acetate copolymer (EVA), while "PET" usually refers to polyethylene terephthalate (PET), a commonly used plastic material. Weather resistance refers to a material's ability to resist the effects of external factors such as sunlight, temperature changes, humidity, and rain when exposed to outdoor or similar environments. This property is usually related to the material's chemical structure and additives. EVA is an elastic material with good flexibility,...
What additives are used to improve the scratch resistance of plastic products?
Plastic products are prone to scratches, affecting their appearance and performance. To improve the scratch resistance of plastics, specialized additives are usually added. Here are some common anti-scratch additives: Silicone oil and silane coupling agents: Silicone oil acts as an external lubricant, reducing the coefficient of friction on the plastic surface, making it less prone to scratches during frictional contact. Silane coupling agents improve the hydrolysis resistance and chemical...
What are the best weather-resistant injection molding materials?
Common materials with good weather resistance include: - ASA/PC: Excellent cold resistance, high heat resistance, and weather resistance. Recommended for exterior automotive applications such as rearview mirrors, radiator grilles, tailgates, and lamp covers. Also suitable for all-weather housings in motorcycle panels, campervans, small boat hulls, surfboards, garden irrigation equipment, lawnmower housings, sewing machines, telephones, kitchen equipment, and satellite antennas....
In which fields are plastic friction-resistant additives used?
Plastic friction-resistant additives are widely used in the following fields: 1. Automotive Industry: Used in the manufacture of automotive interior parts, engine components, transmission system parts, etc., to reduce friction and wear between components, improving service life and performance. 2. Electronics and Electrical Appliances: In products such as wires and cables, connectors, and electrical appliance housings, they enhance the wear resistance of plastics, ensuring they maintain...
Acetal Material Overview I. Definition and Properties of Acetal Acetal (polyacetal), also known as polyoxymethylene (POM) or polyoxymethylene (POM), is a thermoplastic engineering plastic. It possesses excellent comprehensive properties, including high strength, high rigidity, high wear resistance, excellent dimensional stability, and chemical stability. Acetal material has low hygroscopicity, allowing it to maintain stable dimensional and mechanical properties even in humid environments....
What are the advantages and disadvantages of PPE+PS material?
What are the advantages and disadvantages of PPE+PS material? This material possesses excellent electrical insulation and water resistance, good dimensional stability, and a heat distortion temperature between 90 and 175°C. PPE+PS composites have wide applications in electronics, automotive, chemical, and medical device industries. For example, they are used in lithium-ion battery packaging materials, automotive dashboards and bumpers, corrosion-resistant equipment manufacturing, and as a...
What's the difference between FPM and PKM?
What's the difference between FPM and PKM? Both FKM and FPM are fluororubbers, but FKM is the European abbreviation, while FPM is the American abbreviation. Fluororubbers can be divided into three basic types: fluorocarbon rubber, fluorosilicone rubber, and fluorinated phosphazene rubber. Fluororubber is a special synthetic elastomer. Its main chain or side chains have carbon atoms bonded with highly electronegative fluorine atoms. Due to the high C-F bond energy (485 KJ/mol) and the...
Is PC (polycarbonate) material corrosion-resistant?
Is PC (polycarbonate) material corrosion-resistant? Answer: Yes, PC is corrosion-resistant. PC, or polycarbonate, has good chemical stability and can withstand the corrosion of most chemicals. It has good resistance to weak acids, including citric acid and acetic acid, but in high-concentration or strong acid environments, such as nitric acid and concentrated sulfuric acid, PC will corrode and dissolve. Similarly, PC exhibits good stability in neutral and weakly alkaline environments, such as...
Why do dents and shrinkage marks appear on injection molded parts?
The main reasons for dents and shrinkage marks on injection molded parts are as follows: I. Material Factors 1. High Material Shrinkage Rate Different plastic materials have different shrinkage rates. If a material with a high shrinkage rate is selected, it is prone to significant volume shrinkage during the cooling process after injection molding, leading to dents and shrinkage marks. For example, some crystalline plastics such as polyethylene (PE) and polypropylene (PP) have...
What are some medical plastics and their common applications?
Medical plastics are a class of plastic materials used in the medical field. They possess various properties and have a wide range of applications. Below is some important information about medical plastics: I. Commonly Used Medical Plastics and Their Characteristics: **Polyvinyl Chloride (PVC):** Characteristics: Low cost, wide range of applications, easy to process, good chemical resistance, but poor thermal stability. Uses: Commonly used in the manufacture of blood bags, various...
Causes and Solutions for Injection Molding Shortages in Injection Molding Production
Injection molding shortages are a common problem in the injection molding process. The following are the causes and corresponding solutions: I. Injection Molding Process Parameters Insufficient Injection Pressure Causes: Faulty hydraulic components in the injection molding machine's injection system, such as worn oil pumps or leaking valves, can prevent the injection pressure from reaching the set value, resulting in insufficient flow of the molten plastic in the mold cavity. Poor...
Modified PBT (Polybutylene Terephthalate): Common Problems and Solutions
Common Problems and Solutions for Modified PBT Polybutylene terephthalate (PBT) possesses excellent comprehensive properties, such as high crystallinity, rapid molding capability, weather resistance, low coefficient of friction, high heat distortion temperature, good electrical properties, excellent mechanical properties, fatigue resistance, and ultrasonic welding capability. However, it has low notched impact strength, high molding shrinkage, poor hydrolysis resistance, and is susceptible...
Comparison of Shrinkage Rates of Common Injection Molding Plastics
Plastic shrinkage rate refers to the percentage reduction in size of a plastic product relative to the mold cavity size after it has cooled to room temperature after being removed from the mold. It is a crucial parameter in plastic molding, affecting dimensional accuracy, appearance quality, and many other aspects of the plastic product. Influencing Factors **Properties of the Plastic Material Itself:** Different plastics have different molecular structures and crystallinity, leading to...
What is Glass Fiber Reinforced Polymer (GFRP)?
Glass Fiber Reinforced Polymer (GFRP), commonly known as fiberglass, is a fiber-reinforced composite material made with synthetic resin as the binder matrix and glass fiber and its products as reinforcing materials. Here is a detailed introduction: Composition Glass Fiber: The main load-bearing material, characterized by high strength and lightweight, with outstanding performance. It improves the low-temperature impact resistance and stiffness of the composite material and reduces the...
What causes shrinkage cavities in plastic injection molded parts?
The causes of shrinkage cavities in injection molded parts are complex, mainly involving materials, molds, and processes. The following is a detailed analysis: I. Material Factors **High Shrinkage Rate:** Different plastic materials have different shrinkage rates. Some materials, such as polypropylene (PP) and polyethylene (PE), are crystalline plastics. During crystallization, their molecular chains undergo regular arrangement, resulting in greater volume shrinkage and making them prone...
The Relationship Between Gas Generation and Mold During Plastic Injection Molding
Gas generation during plastic injection molding is closely and multifacetedly related to the mold, primarily manifested in key areas such as mold design, mold manufacturing and processing, and mold use and maintenance. Mold Design Aspects Gate Design: As the entry point for molten plastic into the mold cavity during injection molding, the rationality of its design is crucial. If the gate location is improperly chosen, such as not placing it at a thick-walled section of the plastic part,...
Solutions to Flash Problems in Injection Molded plastic Products
Injection molding is a widely used plastic processing method. However, flash frequently occurs during the injection molding process, affecting not only the product's appearance and dimensional accuracy but also increasing post-processing costs. In-depth investigation of the causes of flash and finding effective solutions are crucial for improving the quality and production efficiency of injection molded products. I. Causes of Flash in Injection Molded Products (I) Injection Molding...
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