Researching polymer films can be a difficult task, especially since there is so many different grades, resins, and combinations available. However, breaking down polymer films by molecular structure: amorphous or semi-crystalline can help narrow down the selection to films that will meet property requirements, difficulty of fabrication, and their relative cost.
The difference between amphorous & semi-crystaline films
Semi-crystalline films have a highly ordered molecular structure with sharp melt points. While amorphous polymers soften gradually when the temperature rises, semi-crystalline plastics do not. Instead, they remain solid until a certain quantity of heat is absorbed. The materials then quickly change into a low viscosity liquid. However, the sharp melting point of semi-crystalline polymers makes them difficult to thermoform, but ideal for applications that require a high strength, low friction plastic.
- Softens over a broad range of temperatures
- Easy to thermoform
- Tend to be translucent or transparent
- Bond well using adhesives & solvents
- Prone to stress cracking
- Poor Fatigue Resistance
- Sharp Melting Point
- Difficult to thermoform
- Difficult to bond using adhesives & solvents
- Good resistance to stress cracking
- Good Fatigue Resistance
- Best physical properties above 500ºF
- Best temperature resistance
- Good chemical resistance
Types of amphorous polymer films
Types of semi-crystalline polymer films
CS Hyde Company stocks and converts a variety of high performance and engineering films. We also laminate PSA adhesive to hard to bond semi-crystalline films, ideal for peel and stick bonding applications. To learn more about each of the films view our high performance film catalog, or contact us for additional information.