Composite Type C – Overpressure Bursting Disc

Composite Type C – Overpressure bursting discs are engineered for applications requiring high-precision pressure relief at low to medium burst pressures. Using cutting-edge laser machining, predetermined breaking points are cut into stainless steel, nickel, Inconel, Hastelloy* or tantalum foils with remarkable accuracy—allowing for calibrated burst values as low as 20 mbar at 20 °C.

When the permitted operating pressure is exceeded, the disc opens in a segmental, hinge-type, fragment-free pattern. This makes the unit ideal for installation upstream of safety valves and other sensitive downstream equipment. A PTFE or PFA sealing diaphragm is integrated between the precision-slotted metal foils, ensuring chemical resistance and dependable performance up to 200 °C.

Technical Capabilities

• Low to medium overpressure applications
• Minimum burst pressures from 20 mbar
• Suitable for operating temperatures up to 200 °C
• Available in nominal widths from DN15 to DN900
• Material options: stainless steel, nickel, Inconel, Hastelloy*, tantalum
• Hinge-type fragment-free opening for system protection

Mounting & Configuration Options

Composite Type C discs can be supplied in multiple variants:

• Overpressure model (this product)
• Underpressure model
• Bi-directional model

All versions can be mounted:

• Directly between EN1092 flanges
• Directly between ASME B16.5 flanges
• In dedicated rupture disc holders
• In clamp-coupling systems

Burst Detection Options

• Membrane signal transmitter for direct-mount discs
• Inductive proximity-switch transmitter for holder-mounted discs

Key Benefits

• Customised to your exact material, burst pressure and dimension requirements
• Supports extremely low burst pressures
• Available in large diameters up to DN900
• Fragment-free opening ensures downstream equipment protection
• Optional integrated burst detection
• Possible support-free installation depending on configuration

The Composite Type C – Overpressure disc delivers uncompromising accuracy, dependable performance and broad material compatibility—making it a proven safeguard across chemical, pharmaceutical, energy and industrial processing environments.

Technical Specifications: