"Waste plastics" Source is very complex, performance is different. Only by testing these ten projects, customers only can determine the properties of the plastic meets specific needs.
Impurities: When burning plastic at high temperature, its internal structure will show a series of physical and chemical changes, eventually the organic components will volatilize, and inorganic components (mainly inorganic salts, oxides) will be left behind, these residues are called impurities. General-modified products which impurities is silica, calcium carbonate, talc, glass fiber, titanium dioxide and some other inorganic minerals.
Objective: To test the impurities of plastic products can be initially some qualitative components even semi-quantitative analysis. By measuring the content of inorganic materials in plastics, we can determine the material properties of a material basis for judgment.
Second, water content
Moisture content: refers to the water within the object. Test Purpose: moisture content influences processing technology of polystyrene, polyamide (PA) and polycarbonate (PC) resin, is an important factor in product appearance and product characteristics. In the injection molding process, if the moisture content is too much in plastic particles production, it will produce some processing problems, and ultimately affect the quality of finished products. Such as: surface cracking, reflective, and impact resistance and tensile strength and other mechanical properties decreased.
Third, melt flow index (MFI)
Melt flow Index (MFI): is a kind of flow value in the plastic material processing. Meaning: Indicates the processing flow of the plastic material, the greater its value is, the better the show liquidity is; on the contrary, the worse.
Four physical properties, tensile strength, bending strength, etc.
Tensile test: Determination of basic physical properties of plastics and other materials, after the material is applied to the stress, the measured amount of deformation, stress is obtained, the stress-strain curve is the most common method.
Fifth, the impact resistance
Definition: Central pendulum simply supported beam hit the sample, the sample subjected to impact fracture, when the specimen breaks per unit area or per unit width of the impact energy is consumed by the impact strength. Meaning: describe the degree of toughness is a tough polymer materials under high-speed carom presented, or resistance to fracture capacity. In general, the impact toughness includes two aspects: the deformation capacity and the ability to carry the break by the impact after the former general with an elongation at break expressed, while the latter is generally used to represent the impact strength.
Sixth, Heat deflection temperature
Heat deflection temperature: applied to the polymer or polymer material at a certain load, heating at a constant speed when it reaches a predetermined temperature corresponding deformation.
Test Purpose: polymer is in the glassy or crystalline state, with increasing temperature, atomic and molecular kinetic energy increase in the external force because of its ability to increase the directional movement caused by deformation of the material that is resistant to external forces - modulus with increasing temperature and decreased with increasing temperature, fixed plastic deformation under load generated increases.
Seven, Vicat softening temperature
Meaning: Vicat softening temperature of the material is to evaluate the heat resistance, an indicator of the product under heat conditions of physical and mechanical properties. Vicat softening temperature of the material, although not directly used for evaluation of the actual temperature of the material, but can be used for quality control of guidance material. The higher the Vicat softening temperature is, the material showed that the dimensional stability upon heating is better, the smaller the thermal deformation, i.e., heat deformation is better, the larger the rigidity, the higher the modulus is.
Eight, heat aging test
Objective: To determine exposure before and after performance evaluation plastic heat aging properties.
Nine, the viscosity test
Plastic viscosity: refers to the size of the coefficient of friction between the plastic melt flows macromolecules. It is the level of flow of molten plastic reflection i.e. the greater the viscosity, the stronger the melt viscosity is.
Ten, combustion test
Combustion performance: refers to all the physical and chemical changes during combustion of materials in case of fire occurred, the performance of fire and flame propagation material surface, heat, smoke, carbonization, weight loss, as well as the generation of toxic product, etc. measure. Significance of testing: under specified conditions, the combustion properties of different materials has great significance to the use of materials and manufacturing processes.