In general-purpose silicone rubber applications, while low-phenyl rubber compounds possess excellent flexibility and low-temperature performance, they often suffer from low tensile strength and insufficient tear strength due to weak intermolecular chain forces and poor self-reinforcing properties, limiting their use in dynamic stress scenarios. Phenyl raw rubber, with its unique "chain segment rigidity enhancement" and "filler synergistic reinforcement" mechanisms, acts as the "physical strength strengthening core" of low-phenyl rubber compounds, achieving a performance leap from "weak flexibility" to "strong and tough" without sacrificing flexibility.

The core of phenyl raw rubber's improved physical strength lies in its "phenyl group chain segment anchoring effect." Ordinary low-phenyl rubber compounds, due to their low phenyl content, have excessively flexible molecular chains, making them prone to chain segment slippage under stress, resulting in low strength. Phenyl raw rubber, by introducing an appropriate amount of phenyl groups into the molecular chain, acts like embedding "rigid anchor points" into the flexible chain segments, enhancing the cohesive energy density of the molecular chain. These "rigid anchor points" effectively transfer stress under load, inhibiting irreversible slippage of chain segments, thus increasing tensile strength to over 10 MPa and tear strength by 50%.

Simultaneously, the excellent "filler dispersibility" of phenyl raw rubber allows it to form a "chemically bonded interface" with reinforcing fillers (such as fumed silica). The active hydroxyl groups in its molecular chain undergo a condensation reaction with the silanol groups on the filler surface, constructing a three-dimensional "rubber-filler" network, avoiding stress concentration caused by filler agglomeration. During dynamic tensile testing, this network dissipates energy through an "interfacial debonding-rebonding" mechanism, enabling the rubber to maintain a low Shore A hardness of 30-50 while possessing excellent fatigue resistance.

From molecular-level chain segment anchoring to macroscopic strength enhancement, phenyl raw rubber, with its "rigid-flexible, filler-synergistic" strengthening mechanism, solves the strength shortcomings of low-phenyl rubber compounds. It is not only a key additive for upgrading the performance of general-purpose silicone rubbers but also an invisible support for achieving "high strength, toughness, and long lifespan" in flexible devices.