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General grade polystyrene is a kind of thermoplastic resin, which is colorless, odorless, tasteless and lustrous, transparent bead or granular solid. The density is 1.04 ~ 1.09, the transparency is 88% ~ 92%, and the refractive index is 1.59 ~ 1.60. Under the action of stress, birefringence occurs, which is called stress optical effect. The melting temperature of the product is 150-180 ℃, the thermal decomposition temperature is 300 ℃, the thermal deformation temperature is 70-100 ℃, and the long-term service temperature is 60-80 ℃. After annealing treatment, the stress can be relieved and the hot deformation temperature can be increased. If a little α - methylstyrene is added in the production process, the heat resistance grade of general polystyrene can be improved.
What is the specification in the specification.It can be seen that the melting index needs to be measured when the apparent density of the insulation plate is less than 30kg/m3. The melting index can be divided into two indexes, fracture bending load and bending deformation.
2021 is the beginning year of the "14th Five-Year Plan". There are still huge uncertainties in the situation at home and abroad, and the impact of the epidemic on the economy will continue to exist for a long time. We will continue to follow the wave of bulk commodity transformation and upgrading, deepen its channels, practice its internal skills, accelerate innovation, continue to expand the application depth of financial tools, improve the quality of circulation, and realize the continuous update and iteration of industrial service capabilities, and modernize the entire industrial chain. Constantly contribute.
EPS shape moulding machines produce parts that have custom designed specifications like electronic product packaging after the block moulding machines producing large blocks of EPS, and EPS is a rigid porous plastic that can be found in many shapes and applications. It is most commonly used in fish boxes, consumer goods packaging and building insulation boards. So how to use the EPS shape moulding machine? Please allow me to introduce this to you in the following contents.
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