What are the functions of molded plastics

2020-06-19 1222
Physical Function
 
The forming shortening rate of phenolic molding plastics depends on various factors, such as resin composition, filler variety, moisture content, and composition
 
Shape conditions, etc. The linear expansion coefficient of phenolic resin molding compound is closely related to the type of filler, followed by the glass fiber inside the plastic
 
The increase of inorganic fillers reduces the coefficient of linear expansion, while plastics containing synthetic fibers have a higher coefficient of linear expansion.
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Mechanical function
 
The creep resistance of phenolic molding plastics at room temperature varies depending on the temperature of the filler, including mica, asbestos, etc
 
The molding compound with inorganic fillers has better creep resistance than the molding compound with organic fillers. Generally speaking, molds filled with glass fibers
 
Plastic has good tensile strength and flexural strength, and is less affected by temperature, while some fillers such as wood powder simply absorb moisture
 
It will cause a decrease in flexural strength and flexural modulus.
 
Electrical function
 
Phenolic resin plastic has outstanding electrical properties, such as high insulation at room temperature, high volume resistance, and high surface resistance
 
Surface resistance and breakdown voltage can be used as insulation materials, but their dielectric constant and dielectric loss tangent are relatively large and can only be used as
 
Application of power frequency insulation materials.
 
Corrosion resistance
 
Phenolic resin without fillers is virtually resistant to inorganic acid corrosion and insoluble in most hydrocarbons and chlorides
 
Insoluble in ketones and drunkenness. But it is not resistant to corrosion from concentrated sulfuric acid, nitric acid, high-temperature chromic acid, etc.
 
Article sourced from SMC molded products www.yongshengyi.com