Vamac® HVG is an unfilled high viscosity gum ethylene/acrylic elastomer similar to Vamac® G, but offering higher compound viscosity. The higher viscosity of compounds made with Vamac® HVG results in improved green strength and related processing advantages, such as:- Improved collapse resistance of extrudates
- Enhanced preform dimensional stability
- Improved moldability through elimination of trapped air
Compounds of Vamac® HVG are often selected for applications such as compression molded goods, highly plasticized compounds, and extruded tubing and hose. Vamac® HVG contains a small amount of processing aid. Vamac® HVG is a Vamac® G type polymer with a Mooney Viscosity of 26 compared to 16 for Vamac® G. The two polymers have similar compositions but the Vamac® HVG has a higher molecular weight. They have many common features, including: - Good heat resistance in air
- Good oil and fluid resistance
- Good low temperature properties
- Compounded with similar ingredients
- Cured with same cure package
The big advantage of Vamac® HVG over Vamac® G is that the compounds made from the Vamac® HVG have a higher viscosity. The viscosity of the Vamac® HVG compound can be double that of a Vamac® G compound. This can lead to better processing. Specifically, the potential for a collapsed hose is reduced for an extrusion process and the potential for trapped air in an injection molded compound is reduced. Former DuPont product acquired by Celanese in 2022. |
