Features of Polyimide Sheet

Polyimide is the class of few of the most fire and heat resistant polymers that are known. Quality of the aromatic raw materials is the reason for the outstanding retention of physical and mechanical properties at a very high temperature. These aromatic raw materials are the blocks for building of the polyimide sheet. Polyimides are prepared as both thermoplastics and thermosets. Laminates and moldings both actually depend on thermostat resins. However, few are prepared from thermoplastic grades.

Polyimides are present as laminates, stock shapes, shapes and molded parts from few producers and as resins from other producers unlike many plastics.

Handling exceptionally a wide range of humidity conditions and temperature are among some of electrical properties of polyimides. Parts of polyimides are also not affected by exposure of esters, aliphatic and aromatic hydrocarbons dilute acids, alcohols, ethers, hydraulic fluids, kerosene and freons. Available products of polyimides are: vespel are polyimide shapes and parts, cirlex are polyimide laminate, kapton are flexible polyimide films. The process for obtaining polyimide sheets that has good surface appearance and excellent thermal resistance include melt extrusion process in the temperature range of 300 to 450 degree Celsius from specific polyimide. Moisture content is also needed to be controlled to 200ppm or less.