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• Posted By : frode Cieng
• Posted On : Oct 10, 2024
• Views : 36
• Category : Soccer
• Description :

Overview

• Numerous varieties of engineering plastics are available in the marketplace. Let's explore the main differences between 2 engineering plastics: ABS and PS.
  
  ABS (acrylonitrile butadiene styrene) is characterized as a light yellow, granular, or bead-like opaque resin that is non-toxic and tasteless, exhibiting low water absorption. It possesses outstanding physical and mechanical properties, including remarkable impact resistance at low temperatures, excellent electrical characteristics, wear resistance, dimensional stability, chemical resistance, and dyeing capabilities. Its processing is straightforward.
  
  ABS demonstrates resistance to water, inorganic salts, alkalis, and acids, remaining insoluble in most alcohols and hydrocarbon solvents while being soluble in aldehydes, ketones, esters, and certain chlorinated hydrocarbons. However, it has some drawbacks, including flammability, a low thermal deformation temperature, and inadequate weather resistance. Its combustion characteristics indicate that it is flammable, continues to burn when removed from the flame, produces a yellow flame with thick black smoke, and exhibits softening and foaming, accompanied by the odor of acrylonitrile. In terms of solubility, it is soluble in dichloromethane but insoluble in alcohol, aliphatic hydrocarbons, and water. Its applications span the automobile industry, mechanical equipment, electronic appliances, and more.
  
  PS plastic (polystyrene) is noted for its excellent electrical insulation properties, particularly at high frequencies. It is colorless and transparent, with light transmittance that ranks just below that of plexiglass. It is also colorable, water-resistant, and exhibits good chemical stability, although it has general strength and is prone to brittleness, making it susceptible to stress embrittlement. It is not resistant to benzene, gasoline, and other organic solvents, making it suitable for the production of insulating transparent components, decorative elements, chemical instruments, optical devices, and other applications.
  
  Regarding the molding performance of PS plastic:
  
  1. This amorphous material has low moisture absorption, eliminating the need for complete drying and reducing the risk of decomposition. However, it has a high coefficient of thermal expansion, which can lead to internal stress. It offers good fluidity and can be molded using either screw or plunger injection machines.
  
  1. Elevated material temperatures, increased mold temperatures, reduced injection pressures, and extended injection durations are effective in minimizing internal stress and mitigating shrinkage deformation.
  
  2. A variety of gate designs may be employed, with the gate being connected to the plastic component via an arc to prevent damage to the plastic part during removal. The demolding angle should be substantial, ensuring uniform ejection. The wall thickness of plastic components needs to be consistent, and the use of inserts should be avoided whenever possible. If inserts are necessary, they should be preheated before use.