Specific Gravity: The ratio of weight per unit volume to water, affecting material weight and product density.
\nWater Absorption: Influences dimensional stability and mechanical strength; Nylon\/PET exhibit high water absorption.
\nAir Permeability: Related to gas transmission resistance, affecting packaging and gas barrier properties..<\/p>\n
Tensile Strength and Elongation: Measures material tensile strength and deformation capacity.
\nFlexural Strength and Modulus of Elasticity: Assesses material rigidity and bending resistance.
\nImpact Strength: Indicates energy absorption capacity during impact, commonly tested via Izod.
\nHardness: Rockwell or Shore A\/D tests indicate plastic softness\/hardness levels.<\/p>\n
Heat Deflection Temperature (HDT): Indicates whether material deforms at high temperatures; recommended operating temperature should be 10\u00b0C below HDT.
\nLong-Term Heat Resistance Temperature: As per UL746 standards, represents the temperature at which performance remains stable after tens of thousands of hours of use.
\nMelt Index (MI): Represents plastic flowability when heated; higher MI values indicate better processability.
\nShrinkage Rate: The dimensional difference between the finished product and the mold. Crystalline plastics typically exhibit higher shrinkage rates.<\/p>\n
Chemical Resistance: Stability against solvents and chemicals affects durability.
\nWeather Resistance: Ability to withstand light, heat, and ozone exposure in outdoor environments.
\nFlame Retardancy: Complies with UL94 V0 to V2 standards, used in fire-resistant applications like electronic components and building materials.<\/p>\n
Transparency: PS, PMMA, and PC exhibit high transparency; PP transparency can be enhanced through cooling treatment.
\nGloss: Reflects surface reflectivity, influenced by mold polishing and additives.<\/p>\n
Dielectric Breakdown Voltage: Critical voltage threshold causing insulation failure, dependent on material thickness.
\nVolume Resistivity: Indicates the material’s electrical insulation properties. Higher water absorption reduces electrical resistance (e.g., Nylon).<\/p>\n
Adding glass fiber significantly improves heat resistance and reduces shrinkage.
\nEngineering plastics like PBT, Nylon, and PC exhibit varying properties due to differences in reinforcement and structure.<\/p>\n","protected":false},"excerpt":{"rendered":"
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