Peroxide or Sulphur cured EPDM - What does your application need?
EPDM is one of the most popular and versatile rubber compounds available. The main properties of EPDM are its outstanding heat, ozone and weather resistance.
During the manufacture of EPDM, the compound can be cured with either sulphur or peroxide. The choice of curing method is determined by the end-use and application.
EPDM cured with peroxide possess a superior chemical and thermal resistance compared to sulfur cured. Peroxide cured EPDM can withstand temperatures up to 300°F whereas sulphur cured can only resist temperatures up to 250°F. Peroxide curing also improves the compression set and aging resistance of the part.
Sulphur curing of EPDM is more common, more readily available, and generally more commercially attractive.
Peroxide cured EPDM:
- Higher temperature resistance
- Good resistance to aging
- Lower compression set
- Improved resistance to chemicals and oils
- Will not stain metals or PVC
Sulphur cured EPDM:
- Higher tensile strength
- Higher tear strength
- Permits use of a wider range of fillers