1. Thermal properties: material glass transition temperature, melting point, aging resistance, heat distortion temperature, softening temperature, low temperature resistance (embrittlement temperature), linear thermal expansion coefficient, radial thermal expansion coefficient, specific heat capacity, heat transfer coefficient, etc.
2, mechanical properties: generally characterized by tensile machine, stress-strain curve relationship, tensile strength, elongation at break, modulus, flexural strength, compressive strength, impact strength, hardness, friction coefficient, wear resistance, Poisson's ratio Wait.
3, appearance properties: design optical properties, such as optical transmittance, haze, surface roughness, surface finish, brightness, color, etc., whether there is material precipitation.
4, chemical resistance: acid and alkali resistance and solvent resistance.
5, the nature of combustion: flash point, ignition point, oxygen index, smoky, burning toxicity, flame retardant properties and so on.
6, electrical properties of polymer materials: dielectric constant, dielectric loss tangent, dielectric strength, volume resistivity, surface resistivity, arc resistance and so on.
7, the interface properties of the material: surface tension, contact angle (wetting), surface roughness and so on.
8. Long-term use properties of materials: creep resistance, stress relaxation, weather resistance, fatigue resistance, ozone resistance, UV resistance, radiation resistance, etc.
9. Material processing and molding properties: resistance to stability, Tg (glass transition temperature), melting point, heat distortion temperature, softening temperature, rheology, crystallinity, cohesiveness, melt flow rate, molding shrinkage, processing Process methods, processing accuracy and stability, etc.
10. Other important material properties: density, moisture content, refractive index, gas permeability, moisture permeability, crystallinity, and the like.
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