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High impact polystyrene (HIPS) chemical name: high impact polystyrene (HIPS): hips is the development of rubber modified polystyrene (HIPS) in 1950, mainly to solve the impact brittleness of PS. Various grades of high impact polystyrene with different properties can be produced by adding rubber to polystyrene substrate.

In recent years, a variety of special grades of hips have been developed, including flame retardant grade, stress cracking resistance grade, high gloss grade, extremely high impact strength grade, glass fiber reinforced grade and low residual volatile grading. They have been able to compete with expensive engineering resins in many application fields. The outstanding characteristics of impact polystyrene are easy processing, excellent dimensional stability, high impact strength and high rigidity.

HIPS plastic film roll is just about heat resistance. Oxygen permeability, UV stability and oil resistance are limited. The properties of hips are closely related to the content of rubber phase in the system. Physical and chemical properties: hips is developed on the basis of PS. PS has good transparency, high hardness, and is easy to be processed. In order to increase its service performance and improve its brittle fracture, butadiene rubber was added during polymerization to increase its toughness.

The impact toughness of hips after toughening was four times higher than that of PS. According to the amount of added, it can be divided into low impact PS, medium impact PS, high impact line PS. However, the addition of rubber reduces its surface gloss. After modification, the use temperature of the material was increased.
The thermal deformation temperature was 96 ℃. Hips was also a flammable plastic with limiting oxygen index (LOI) of 17.8. The flame was orange yellow with a lot of black smoke during combustion. The combustion characteristics of hips were softening, foaming and charring, with special styrene monomer flavor.