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Durostone CAS761 is a high-performance, glass-fiber-reinforced composite material, specifically engineered for extreme thermal and mechanical stress environments—most notably in PCB assembly and wave soldering applications.
Developed by Rochling, CAS761 belongs to the Durostone® product family and is known for its exceptional dimensional stability, low thermal conductivity, and high resistance to soldering fluxes and chemical attack.
This composite is the go-to material for PCB soldering carriers, pallets, and insulation tooling—areas where materials must maintain strength and shape at elevated temperatures while remaining electrically non-conductive. ⚙️
Durostone CAS761 is composed of:
Glass fiber reinforcement (for strength and rigidity)
Epoxy resin matrix (for thermal and chemical resistance)
Fillers and additives (enhancing flame resistance, machinability, and dimensional stability)
🪨 Glass fibers → Excellent tensile and flexural strength
🔥 Epoxy matrix → Resistance to soldering heat (up to 280–300°C short-term)
🧪 Filler system → Low water absorption and excellent chemical resistance
Together, these elements provide a composite material that is thermally stable, chemically inert, and mechanically robust—even during repeated heating and cooling cycles in demanding environments like wave soldering machines.
Durostone CAS761 is specifically formulated to be CNC machinable, enabling tight tolerances and repeatable quality in complex fixture design. 🧩
| Feature | Performance |
|---|---|
| Machinability | Excellent |
| Dimensional stability | Very high |
| Tool wear rate | Moderate |
| Surface finish quality | High |
Best practices for machining CAS761:
Use PCD or solid carbide tools
Implement dust extraction systems due to glass fiber content
Apply low-to-moderate cutting speeds
Avoid excessive heat buildup to preserve resin integrity
🛠️ It can be drilled, milled, and shaped into intricate fixture geometries, including pin locators, support structures, and vacuum grooves, without compromising mechanical performance.
Durostone CAS761 is engineered to perform reliably under thermal, mechanical, and chemical stress.
| Property | Value / Performance |
|---|---|
| Maximum Operating Temperature | ~280°C (short-term) |
| Thermal Conductivity | Very low (excellent insulator) |
| Flexural Strength | ≥ 300 MPa |
| Density | ~1.85 g/cm³ |
| Electrical Insulation | Excellent |
| Water Absorption | ≤ 0.15% |
This unique combination ensures the material remains:
📐 Dimensional stable under heat
🔌 Non-conductive in high-voltage environments
🌡️ Thermally insulating to protect sensitive electronics
⚠️ Note: CAS761 is not suitable for cryogenic or ultra-high-frequency RF environments.
Durostone CAS761 is a staple in electronic manufacturing, particularly in processes involving intense heat exposure and mechanical handling. Common applications include:
🔧 PCB Soldering Fixtures
– Wave soldering pallets
– Reflow oven carriers
– SMT fixtures and supports
📦 Thermal Protection Components
– Insulating plates in high-temp jigs
– Shields in automated assembly lines
⚙️ Precision Tooling
– Fixtures for robotic PCB handling
– Vacuum pick-and-place plates
Its non-conductive and low-outgassing nature also makes it suitable for use in cleanroom environments.
Let’s break down the 5 powerful advantages of Durostone CAS761 for engineers:
Withstands wave soldering temperatures up to 280°C without deformation or delamination.
Maintains shape and precision across thermal cycles—essential for fixture repeatability.
Ensures no conductivity even in high-voltage or sensitive circuitry environments.
Inert to solder fluxes, cleaning agents, and most industrial solvents.
Adaptable to custom shapes and complex profiles, ensuring perfect fit in assembly lines.
🧠 Compared to other composites or basic phenolic boards, CAS761 offers significantly improved thermal and dimensional performance, giving engineers confidence in fixture integrity over time.
Durostone CAS761 stands out as a high-performance composite material purpose-built for thermal-resistant, precision-critical applications in the electronics industry. Its unique combination of heat tolerance, machinability, insulating properties, and mechanical stability makes it an engineering material of choice for designers and production specialists alike. 🔬
Whether you’re developing wave solder pallets, reflow carriers, or thermal protection jigs, CAS761 delivers long-term reliability and precision.
🎯 Looking for a trusted composite for your next thermal fixture design?
Durostone CAS761 might just be your ideal solution—strong, stable, and built for heat. ♨️
