Supporting More Efficient Engines

Technology that boosts efficiency, while reducing the size of gas and diesel engines, is the main route to lower emissions and improved fuel economy. More than 65% of energy loss happens within the engine, so DuPont is focusing on heat, pressure, and chemical-resistant elastomers to make engines lighter. Vamac® and Viton® are important contributors to the equation.

From Blueprints to Compliance Tests

DuPont engine efficiency experts are working on technologies that can help automakers reach their efficiency goals sooner. Of special interest is how materials and science can reduce friction and optimize the mass-to-efficiency ratio. Light-weight materials that can stand up to heat, chemicals and pressure are key to reaching new goals and emissions standards.

Recent changes in engine technology, including turbochargers, exhaust gas recirculation loops, selective catalytic reduction, bio-fuels and high-pressure direct fuel injection, have led to new requirements for underhood components, including ducts, hoses and seals, that can tolerate more extreme chemicals. DuPont responded by developing Vamac® Ultra® and Viton® APA.

Enhanced Performance to Meet New Demands

Higher viscosity grades, known as the Vamac® Ultra® product series, provide enhanced properties that extend its thermal capabilities range as wide as -40°C to 180°C and peaks to 200°C. Vamac® Ultra® HT was developed with properties to meet the demand for higher-temperature-resistant turbocharger hoses and ducts.

Vamac® Ultra® products combine other properties with high thermal resistance. They also offer higher flex fatigue resistance, enhanced mechanical properties and better low-temperature flexibility. This next-generation material was quickly adopted by the industry for its expanded properties, including heat resistance in the presence of engine and transmission lubricants, or acids from exhaust gas recirculation and closed crankcase ventilation systems.

Next-Generation Performance

Viton® APA types utilize innovative cure site technology to provide excellent mechanical properties, such as tensile strength and compression set, while also delivering superior resistance to fluids such as oils, fuels, and aqueous acid condensates.   Additionally, Viton® APA types provide outstanding high-temperature resistance up to 250°C. Specialty low-temperature Viton® APA types can provide sealing capability down to -40°C in some applications.