||January 1, 2008
Polyacrylic (ACM) elastomers have undergone continuous improvement in an effort to enhance long-term performance, resulting in an important position in the manufacture of heat and oil resistant gaskets, seals, and hose. In order to narrow the gaps between high-temperature performance, fuel resistance, and cost, Zeon Chemicals has recently introduced a fuel resistant ACM polymer. When tested in low molecular weight hydrocarbon fuels such as gasoline, this new ACM polymer has comparable fuel resistance to that of a mid-range, acrylonitrile rubber but with the heat resistance of high-temperature ACM technology. Development efforts have also focused on producing ACM polymers with improved processing for molding or extrusion of low-hardness ACM compounds. Zeon Chemicals’ HyTemp® AR214 is a new extrusion grade, high-temperature ACM (HT-ACM) with improved low-temperature performance but with the same molding and extrusion characteristics of HyTemp® AR212HR. By blending HyTemp AR13FR with other HT-ACM polymers like HyTemp AR214, the oil and fuel resistance of an HT-ACM compound can be greatly enhanced, thus broadening the functionality of ACM even further. Because of this, HyTemp AR13FR can allow for a lower-cost alternative for applications where higher priced elastomers were once required in order to meet the demands of high-temperature environments and resistance to “splash” contact with low molecular weight hydrocarbon fuels.