IKA LR 1000.40 Shaft coupling, FFKM, vacuum, for LR 1000, 0025001950

Polymer physics and dynamic system sealing

In chemical reaction engineering under extreme environmental conditions – such as with highly aggressive solvents, strong acids or complex syntheses under high vacuum – the physical implementation of rotating tool shafts within the enclosed reaction chamber represents the most critical aspect of system hermeticity. Conventional O-rings made of FKM or EPDM swell due to solvent intercalation, lose their molecular spring force or undergo chemical degradation. The IKA LR 1000.40 shaft housing is therefore fitted with highly specialised dynamic sealing elements made of FFKM (perfluoroelastomer). This high-performance elastomer combines the absolute chemical inertness and thermal stability of PTFE (Teflon) with the viscoelastic, self-sealing memory behaviour of conventional rubbers. This material architecture guarantees that the reactor system remains absolutely vacuum-tight and leak-free, even when processing highly corrosive media and under constant mechanical friction from the rotating shaft.

Kinematic alignment and tribology

In addition to thermodynamic insulation, the shaft mounting fulfils a critical static function. Highly viscous, structurally viscous media generate enormous radial and tangential flow resistances during the rotation of large agitators. These transmit massive lateral shear forces (bending moments) to the stainless steel shaft. The LR 1000.40 mount acts as a rigid mechanical bridge element. It secures the shaft in perfect alignment (coaxially) along the Z-axis and absorbs the hydrodynamic vibrations. This resonance suppression is tribologically essential: any eccentricity or imbalance in the agitator would otherwise mechanically wear down the sensitive FFKM sealing lips under constant vacuum pressure and immediately destroy the hermetic barrier.

Thermodynamic load capacity in the reactor setup

The shaft mounting is precisely engineered to match the thermodynamic performance spectrum of the IKA LR 1000 system. The solid stainless steel components and the FFKM seals withstand the standardised maximum temperatures of 120 °C in continuous operation without plastic deformation or loss of seal integrity. Assembly is achieved via a positive-lock fit and is completely gas-tight, directly onto the standardised feed-throughs (standard ground joint) of the reactor lid, which enables safe operation under inert protective gas atmospheres to prevent the oxidation of moisture-sensitive polymerisations.

Technical details

• Product type: Mechanical shaft coupling / stirrer adapter
• Process function: Dynamic, gas-tight shaft seal
• Seal material: FFKM (perfluoroelastomer)
• Mechanical housing: Solid, chemical-resistant stainless steel
• Chemical resistance: Maximum resistance to highly aggressive solvents, acids and alkalis
• Vacuum compatibility: Guarantees absolute system hermeticity during high-speed evacuation
• Tribology: Abrasion-resistant sealing lips for continuous shaft rotation
• Thermodynamic capacity: Designed for reactor temperatures up to 120 °C
• Compatibility: Exclusively compatible with IKA LR 1000 lid systems

Scope of supply

• 1 x IKA LR 1000.40 shaft coupling (including FFKM sealing elements)

(Important note: Stirring shafts, sensors and the LR 1000 reactor vessel are not included in the scope of delivery!)

Custom requirements & accessories

The FFKM shaft coupling is a process-related wear and bridging component. Although FFKM exhibits extreme chemical and mechanical resistance, even these dynamic seals are subject to a protracted tribological wear process under constant friction. For facilities operating continuously 24/7 under high vacuum, we recommend metrologically testing the system’s leak-tightness as part of GLP maintenance intervals. Please contact our specialist procurement service at any time for assistance with configuring your reactor setup and sourcing FFKM replacement seals.