Why ±30μm Precision in Solid Silicone is a Game-Changer for Engineers

In the world of high-precision engineering, Liquid Silicone Rubber (LSR) is frequently marketed for its ±0.01 mm tolerance. However, at Vina Rubber, we have mastered High Consistency Rubber (HCR) to achieve an ultra-precision tolerance of ±0.03 mm (30μm).

While the industry often chases marginal gains in precision, we focus on the “Mechanical Backbone” of the component. Our HCR solutions offer a superior balance of micro-precision and rugged durability that LSR simply cannot match.

Our verification process of 0.21±0.03 mm precision for Memetis GmbH’s micro-valve systems

1. Tensile Strength: Power Under Pressure

The structural integrity of a component under tension is its first line of defense.

• HCR (Solid Silicone): Boasts a tensile strength of 9.0-10.0 MPa. This high molecular weight structure makes it incredibly resilient against snapping under extreme stretching.
• LSR (Liquid Silicone): Typically ranges much lower, between 5.0-7.0 MPa.
• The Verdict: HCR provides nearly 40% more strength. For valve membranes or high-pressure seals, this translates to a significantly wider safety margin.

2. Tear Resistance: The “Anti-Notch” Advantage

Engineers know that LSR can be “notchy”—a tiny surface nick can quickly propagate into a total part failure.

• HCR Tear Strength: Reaches 35-45 kN/m. Its long-chain polymer structure acts as a natural barrier, stopping tears before they start.
• LSR Tear Strength: Generally lingers around 15-25 kN/m.
• Application: In critical environments like Ultra-Thin Silicone Membrane (Memetis) or Medical Gaskets (Simport), HCR’s superior tear resistance is the only logical choice for long-term reliability.

3. Elongation at Break: Flexibility Without Failure

Precision parts must often deform and return to their original shape without losing seal integrity.

• HCR Elongation: Achieves 450-600%, allowing the material to endure severe mechanical cycles.
• LSR Elongation: Typically falls within 300-500%.
• HCR’s ability to stretch further before breaking ensures that components like micro-valves for Memetis maintain peak performance even under irregular load spikes.

4. Precision Meets Reality: The 30μm Sweet Spot

Achieving ±0.03 mm (30μm) with HCR delivers what we call “Functional Equivalence” to LSR’s 10μm precision, but with three distinct advantages:

1. Superior Toughness: A part that survives harsher environments.
2. Anti-Fatigue: Better resistance to repeated mechanical stress over time.
3. Maximum Economy: A highly cost-effective production process with lower material and tooling overhead (CAPEX).

Conclusion: The Smart Choice for Global Engineering

If your project requires the precision of a Swiss watch but the toughness of a heavy-duty engine, don’t be misled by the “LSR hype.”

Vina Rubber’s Ultra-Precision HCR molding offers 10 MPa tensile strength and 45 kN/m tear resistance at ±0.03 mm (30μm) precision. It is, quite simply, the most economical and durable high-performance silicone solution on the market today.