Satellite Components

Satellite Components Platinum-Cured Liquid Silicone Rubber (LSR) LSR Injection Molding with Arburg Allrounder A 1000T

As an engineer designing components for the unforgiving vacuum of space, you operate in a world of absolutes. There is no room for "good enough." Components must withstand extreme thermal cycling, atomic oxygen, radiation, and the violent shock of launch, all while performing flawlessly for decades. For seals, gaskets, dampers, and flexible interconnects, this reality pushes material science and manufacturing processes to their theoretical limits. This is especially true when working with materials for Satellite Components, where failure is not an option.

The challenge intensifies when the ideal material, from a performance standpoint, is a manufacturing nightmare. Enter platinum-cured liquid silicone rubber. Its chemical purity, thermal stability, and exceptionally low outgassing properties make it a prime candidate for space-grade applications. However, its extremely low viscosity—often compared to water—makes it notoriously difficult to mold. On conventional injection molding machines, the immense pressure required to fill the mold cavity forces this low-viscosity material into the parting line, creating excessive, inconsistent flash. This flash necessitates secondary removal operations, typically cryogenic deflashing, which introduces unacceptable risks of micro-fractures and compromises the dimensional integrity and surface finish of the final part. At MechanoFab, we don't just mitigate this problem; we have engineered a solution that eliminates it at its source.

Our specialized process combines the superior properties of materials like Wacker SILPURAN® 6000/40 with a purpose-built manufacturing cell centered around the Arburg Allrounder A 1000T. This isn't just LSR Injection Molding; it's a holistic system designed to produce net-shape, flash-free satellite components directly from the mold, ensuring unparalleled reliability and performance where it matters most.

Uncompromising Compliance: Meeting AS9100D and NASA/ESA Space Qualification Standards

For aerospace and satellite hardware, compliance is not a checkbox; it's the foundation of trust and mission success. Our manufacturing process is architected from the ground up to meet and exceed the stringent requirements of AS9100D, MIL-PRF-38534, and NASA/ESA space qualification standards.

AS9100D: Process Control and Risk Mitigation AS9100D places a heavy emphasis on rigorous process control, traceability, and proactive risk management. Our choice of the Arburg Allrounder A 1000T is central to this commitment. The machine's advanced SELOGICA control system provides real-time monitoring and closed-loop control of every critical process parameter—injection speed, pressure, mold temperature, and clamping force. This allows us to achieve a process capability index (Cpk) consistently greater than 1.67 for critical-to-quality (CTQ) features. In practical terms, this is a Six Sigma level of quality, translating to fewer than 3.4 defects per million opportunities. This statistical certainty is non-negotiable for mission-critical components.

Furthermore, by engineering a process that eliminates the need for cryogenic deflashing, we remove a significant source of process variability and risk. Secondary operations like deflashing are notoriously difficult to control, can introduce mechanical stress, and create latent defects (micro-fractures) that are nearly impossible to detect with non-destructive testing but can become catastrophic failure points under the thermal and vibrational stresses of space. Our net-shape molding approach simplifies the entire validation and qualification workflow, providing a more robust and predictable manufacturing chain that is inherently compliant with the risk-averse principles of AS9100D.

NASA/ESA Standards: The Physics of Outgassing and Thermal Stability The vacuum of space makes material outgassing a primary engineering concern. Volatiles released from a component can condense on sensitive optical surfaces (lenses, sensors) or contaminate nearby electronics, leading to mission failure. NASA-STD-6016 and its ESA equivalent (ECSS-Q-ST-70-02C) mandate strict limits on Total Mass Loss (TML) and Collected Volatile Condensable Materials (CVCM) when tested according to ASTM E595.

Meeting these standards begins with the material chemistry. Platinum-cured silicones like Wacker SILPURAN® 6000/40 are addition-cure systems, meaning the crosslinking reaction produces no byproducts. This contrasts with peroxide-cured systems, which can leave behind residual volatile organic compounds. However, material choice is only half the battle. Achieving the material's full low-outgassing potential depends entirely on achieving a complete and uniform crosslinking reaction during molding.

This is where the superior thermal management of our Arburg-centric process becomes critical. Any temperature variation across the mold surface can lead to areas of incomplete cure, trapping unreacted oligomers within the material matrix. These trapped molecules are the primary source of outgassing. The Arburg's precise, multi-zone mold heating and sophisticated temperature control ensure an exceptionally uniform thermal profile, guaranteeing a complete cure throughout the part geometry. This repeatable, optimized crosslinking is the key to minimizing residual volatiles and consistently passing the stringent TML and CVCM requirements for spaceflight hardware. The result is a component that is stable and inert, preserving the integrity of the entire satellite system.

Core Process & Material Specifications

To achieve this level of precision, every parameter of the material, machine, and process must be perfectly synchronized. The following table details the key specifications of our satellite-grade LSR molding capability. This is not a list of theoretical maximums; this is the operational envelope within which we deliver qualified, flight-ready hardware.

Cost & Volume Dynamics: The TCO of Perfection

The economic viability of a manufacturing process is as critical as its technical capability. Our process is optimized for production volumes ranging from 500 to over 100,000 units, covering everything from initial qualification lots to full-scale constellation production. While the initial tooling investment for high-precision, flash-free LSR molding is significant, the analysis must focus on the Total Cost of Ownership (TCO), not just the per-part price.

The core of our economic advantage lies in the Factory Specific Advantage: Tackling the extremely low viscosity of platinum-cured liquid silicone rubber for satellite-grade components is a core challenge. Our approach leverages the Arburg Allrounder A 1000T's exceptionally rigid, FEM-optimized clamping unit. This prevents the platen deflection that causes flash on conventional machines, allowing us to produce net-shape parts directly from the mold. The superior thermal management of the Arburg ensures precise, repeatable crosslinking, which is critical for meeting the low outgassing and thermal stability requirements of NASA/ESA standards. By perfecting the single-step molding process at MechanoFab, we eliminate the need for secondary cryogenic deflashing—a step that introduces risk of micro-fractures and compromises the component's integrity in vacuum environments, directly addressing the industry's concern over material performance and reliability.

Let's break down the TCO reduction:

1. Elimination of Secondary Operations: Cryogenic deflashing is not a trivial step. It requires specialized equipment, liquid nitrogen, skilled labor, and additional quality control stages. By producing net-shape parts, we completely remove this entire operational cost center from the equation.
2. Increased Yield: A process that relies on secondary operations inherently accepts a certain scrap rate. Parts can be over-blasted, leading to dimensional failure, or under-blasted, requiring a second pass or manual touch-up. Our net-shape process dramatically increases first-pass yield, often approaching 99% on stable runs, directly reducing the effective cost per good part.
3. Reduced Qualification & Inspection Overhead: Qualifying a multi-step process is exponentially more complex than qualifying a single-step one. By eliminating deflashing, we remove a major variable, simplifying the Process FMEA, reducing the scope of validation testing, and lowering the overhead for both our quality team and yours.
4. De-Risking the Supply Chain: The most significant, albeit hardest to quantify, cost saving is risk reduction. A latent micro-fracture induced by deflashing can lead to in-orbit failure, costing millions and jeopardizing the entire mission. The cost of this risk is astronomical. Our process provides the highest possible assurance of component integrity, delivering peace of mind that cannot be found in a multi-stage, higher-risk manufacturing chain.

For volumes starting at 500 pieces, the benefits of a stable, qualified, single-step process begin to outweigh the initial tooling costs. As volumes scale to 100,000+ units for large satellite constellations, the TCO savings become immense, making our approach the most economically sound solution for producing high-reliability space-grade silicone components.

Conclusion: From Engineering Challenge to Mission Success

The unique challenges of manufacturing with low-viscosity, platinum-cured LSR for satellite applications demand more than just a capable machine; they require a deeply integrated system of material science, process engineering, and metrology. At MechanoFab, we have invested in creating precisely that system. By pairing the inherent purity of Wacker SILPURAN® 6000/40 with the unyielding rigidity and thermal precision of the Arburg Allrounder A 1000T, we deliver net-shape components that meet the absolute requirements of spaceflight. No flash. No secondary operations. No compromises.

You've seen the data and you understand the physics. Let's build components that meet the demands of your mission.