NoxtiteŽ High Performance High Temperature Acrylate Rubbers (HT-ACM), Improved Media Resistance In Fuels and New Highly Additivated Engine and Transmission Oils, A Comprehensive Study

In the early 21^st century, we introduced a new high temperature Noxtite^® ACM type family (HT-ACM’s) with significantly improved heat resistance compared to existing acrylate polymer grades. Those developments opened the scope of applications to longer lifetimes i.e. in Noxtite^® ACM head cover gaskets or other sealings e.g. O-rings or precision molded parts and also in new fields of applications for turbo charger, fuel and oil hose applications.

The continuing trend for super charged engines, as a tribute to better fuel economy, along with smaller engine compartments and encapsulation of the engine block added new requirements to elastomeric parts under the hood up to 190°C where 150°C had been sufficient before or, otherwise, high cost FKM and VMQ needed to be used. Unimatec´s technology closed this new temperature gap between ACM and FKM with the newly developed Noxtite^® HT-ACM types. This generation of Noxtite^® HT-ACM became superior in heat-resistance up to 190°C.

 This paper highlights further Noxtite^® HT-ACM grade developments in regard to significantly improving media resistance e.g. in fuels and new highly additivated engine and transmission fluids used in “blow-by”, EGR as well as engine and transmission oil hose type applications respectively. A comprehensive study including heat ageing, engine and automatic transmission oil as well as fuel immersion data will also show the strengths of Noxtite^® based formulations in comparison to other competitive acrylate rubber compositions.