Under the rigorous operating conditions of racing engines, the sealing performance of the intake manifold directly dictates the stability of power output. Particularly in vacuum environments, traditional sealing materials are prone to failure due to high temperatures (>200°C), leading to intake leaks and a sudden drop in power. The advent of phenyl raw rubber—distinguished by its exceptional resistance to high temperatures and superior vacuum sealing properties—has emerged as the key material for resolving this critical challenge.

Phenyl raw rubber establishes a unique heat-resistant structure by incorporating phenyl groups into its molecular chains. Its glass transition temperature (Tg) ranges from -20°C to 0°C, while its decomposition temperature exceeds 350°C; this allows it to maintain stable elastic deformation capabilities even during the sustained, high-load operation of a racing engine, thereby ensuring a gap-free sealing interface. Compared to traditional silicone rubber, phenyl raw rubber exhibits a 50% reduction in compression set under high-temperature (250°C) vacuum environments, effectively preventing sealing failures caused by material hardening.

In engineering applications, phenyl raw rubber is fabricated into sealing components—such as O-rings and gaskets—and installed at the junction between the intake manifold and the cylinder head. Its low volatility (≤0.5%) is a critical attribute; in vacuum environments, small-molecule substances within materials tend to volatilize and outgas, forming bubbles that can rupture the sealing layer. The rigid molecular chain structure of phenyl raw rubber inhibits the migration of these small molecules, ensuring that vacuum levels are maintained at the 10⁻³ Pa range—a standard that meets the stringent requirements for intake air purity in racing engines.

Furthermore, the fuel resistance of phenyl raw rubber further enhances sealing reliability. Trace amounts of fuel vapor within the intake manifold do not cause the material to swell; its volume change rate remains below 2%, thereby preventing the imbalance of sealing preload force that can result from material expansion. Following the adoption of phenyl raw rubber seals by a Formula 1 team, engine testing—conducted continuously for three hours at speeds exceeding 15,000 rpm—demonstrated that intake manifold vacuum fluctuations remained below 1%, resulting in a 15% improvement in power output stability. With the iterative advancement of racing technology, phenyl raw rubber—distinguished by its comprehensive advantages in high-temperature resistance, vacuum resistance, and chemical resistance—has emerged as the material of choice for high-performance engine sealing systems. It not only ensures the reliability of power delivery in racing vehicles operating under extreme conditions but also serves as a crucial reference for technological upgrades in high-performance road cars.